CN1914122B

CN1914122B - Process for biological treatment of organic waste water

Info

Publication number: CN1914122B
Application number: CN2005800038510A
Authority: CN
Inventors: 藤岛繁树; 依田元之
Original assignee: Kurita Water Industries Ltd
Current assignee: Kurita Water Industries Ltd
Priority date: 2004-02-02
Filing date: 2005-01-25
Publication date: 2012-09-05
Anticipated expiration: 2025-01-25
Also published as: CN101456645A; CN101456645B; CN101328001B; CN1914122A; JP4474930B2; CN101328001A; JP2005211879A

Abstract

A multistage active sludge process utilizing the predatory activity of small organisms, in which while maintaining the stable quality of treated water, further enhancement of disposal efficiency and reduction of the volume of excess sludge generated can be realized. There is provided a process comprising the first biological treatment step of conducting high-load treatment of BOD contained in an organic waste water to thereby convert the same to dispersed microbial cells and the second biological treatment step of flocculating the dispersed microbial cells resulting from the conversion and causing small organisms to coexist therewith. The second biological treatment step is carried out at a pH value of 5 to 6. Alternatively, an excess sludge treating step, wherein the sludge resulting from the second biological treatment step and/or the sludge obtained by solid-liquid separation of the sludge resulting from the second biological treatment step is at least partially decomposed in aerobic conditions and wherein the resultant treated sludge is returned to the first biological treatment step and/or the second biological treatment step, is carried out at a pH value of 5 to 6.

Description

The bioremediation of organic drainage

Invention field

The present invention relates to the bioremediation and the device of organic drainage.

Background technology

Hope now that a kind of can be used for living drainage, Xia Shui, food factories and pulp factories is the bioremediation of organic drainage of processing of organic drainage of the extensive concentration range of representative.Special not hope worsens water quality treatment, can improve the bioremediation of the organic drainage of processing efficiency and reduction excess sludge generation.

Advantages such as employed activated sludge process is good owing to water quality treatment during the biological treatment organic drainage, maintenance is easy are widely used in water treatment down, industrial wastewater processing etc.But, because the BOD volumetric loading in the activated sludge process is about 0.5～0.8kg/m ³About/d, so need land area widely.Because 20% of the BOD that decomposes is converted into thalline, is mud, handles so produce a large amount of excess sludges.

High loading about organic drainage is handled the fluidized bed process of known interpolation carrier.When using this method, can be with 3kg/m ³The BOD volumetric loading running that/d is above.But the mud generation is about 30% of the BOD that decomposed in this method, more than the common activated sludge process.

The special public clear 56-48235 communique of Japan discloses following method; That is, bacterial treatment organic drainage in first treatment trough at first, the organism that the oxygenolysis draining is contained; After being converted into the thalline of bacterium of non-compendency, in second treatment trough, removed by the predation of anchorage protozoon.This method can reduce surplus sludge volume.In Japanese special public clear 62-54073 number, 2 grades of same biological treatments have also been put down in writing.Utilize these methods, but high loaded process also can improve active sludge treatment efficient.

In No. 3360076 communique of Japanese Patent; Put down in writing following method, that is, and in this 2 grades of biological treatments; From biological treating tank, discharge and contain protozoic active sludge; In the reaction treatment groove, carry out sterilization and can dissolve processing, return biological treating tank again, can further reduce the excess sludge generation thus.

In No. 3410699 communique of Japanese Patent, put down in writing following method, that is, be carrier fluidized bed formula through making the previous stage biological treatment, make back one-level biological treatment for multistage active sludge treatment, can further reduce the excess sludge generation.In the method,, can make mud oneself oxidation, significantly reduce the mud output through being the active sludge treatment of one-level behind the low load operation of 0.1kg-BOD/kg-MLSS/d with the BOD sludge loading.

The special public clear 55-20649 communique of Japan discloses following method; Promptly; Bacterial treatment organic drainage in first treatment trough at first, the organism that the oxygenolysis draining is contained, be converted into the thalline of bacterium of non-compendency after; In second treatment trough, removed, can reduce surplus sludge volume thus by the predation of anchorage protozoon.Utilize this method, but also high loaded process also can improve active sludge treatment efficient.

For example, in TOHKEMY 2000-210692 communique, the countermeasure that the handling property that this problem of water quality change of the former water in the treatment process of the special public clear 55-20649 communique of proposition Japan causes worsens.Specifically enumerated out " the BOD change of processed water is adjusted in the median 50% of the equal concentration of anomaly ", " through the time measure in first treatment trough water quality with first treating water ", method such as " in first treatment trough, adding microbial preparation or seed sludge during the water quality deterioration of first treating water ".

In the special public clear 60-23832 communique of Japan, following method has been proposed; Promptly; When making primary sludge or the excess sludge of protozoon, metazoan predator bacteria, yeast, actinomycetes, algae, mould fungi or wastewater treatment; Through ultrasonication or mechanical stirring, make the mouth of the flocculation size of above-mentioned bait less than animal.

Utilize the multistage activated sludge process of the predation of above-mentioned tiny organism to be applied to the organic drainage processing, for different draining objects, can improve processing efficiency, reduce the mud generation.

For example, utilize animalcule when predation, though mud reduces effect according to the water quality of treatment condition, draining and difference can be reduced to about 30～70% with the sludge quantity that conventional actived sludge produces.

But, though mud reduces effect according to the water quality of treatment condition, draining and difference can be reduced to the sludge quantity that produces in the single-channel type activated sludge process about half.This is because at the tiny organism groove of the back one-level of the mud that is used for the predator bacteria main body, and most of mud is prey and residual not, or can't keep to high density and prey on relevant tiny organism.

And owing to compare with bacterium, the tiny organism of preying on is a higher organism, so the life-span long (self-decomposition rate is slow), this makes further minimizing sludge quantity become difficult.

Animalcule not only breeds through division, and what have also breeds through ovum.In this representational metazoan rotifers is arranged.This animalcule is considered to mud reduced has contribution, but is not often to be in vegetative state (state of can laying eggs), and hatching reached the life-span and death after promptly do not lay eggs in tens days after tens days.When these animalcules are preponderated, even lay eggs, the adult of sufficient quantity exist or the major part of mud only excrement piece and the bacterium that becomes bait can't hatch sometimes after a little while, therefore have the animalcule in the time slot dead together.It is medium-term and long-term stable and keep low mud generation that this metazoal characteristics cause difficulty in the activated sludge process of utilizing animalcule.

In the multistage activated sludge process of the self-digestion that utilizes bacterium,, all can reduce the mud generation about 50% no matter which kind of bacterial condition (dispersion state, flocculation, thread) is compared with conventional actived sludge.But; In order to obtain 50% mud reduction; Need in the biological treating tank that carries out self-digestion, set detention time of mud long, if import membrane separation unit for this reason, then the maintenance cost of film will be offset the reduction that mud reduces the process cost of bringing.

Therefore; In order to utilize the aerator tank that has been provided with to reach the mud decrement more than 50% with lower operational cost, the utilization of animalcule is effectively, stably carries out in order to make it; In the biological treating tank of previous stage, need stably to generate the bacterium that is prone to by the animalcule predation.

Summary of the invention

The object of the present invention is to provide the bioremediation and the device of organic drainage; Wherein in the multistage activated sludge process of the predation that utilizes tiny organism, when keeping stable treated water, realize the further raising of processing efficiency and the reduction of excess sludge generation.

The 1st aspect relates to the bioremediation and the device of organic drainage; It is characterized in that; Handle the BOD in the organic drainage so that it is converted in the bioremediation and device of organic drainage of the 1st biologic treatment process of disperseing thalline and the 2nd biologic treatment process that will in the dispersion thalline flocculating that transforms, make the tiny organism coexistence having high loading, the 2nd biologic treatment process is carried out under the condition of pH5～6.

The 2nd aspect relates to the bioremediation and the device of organic drainage; It is characterized in that; Have high loading handle in the organic drainage BOD so that its be converted in the bioremediation of organic drainage of the 1st biologic treatment process of disperseing thalline and the 2nd biologic treatment process that will in the dispersion thalline flocculating that transforms, make the tiny organism coexistence; Have the mud of mud and/or the 2nd biologic treatment process of solid-liquid separation the 2nd biologic treatment process, under aerobic conditions decompose the excess sludge treatment process of at least a portion of the mud that obtains; The processing mud of this excess sludge treatment process is back to said the 1st biologic treatment process and/or the 2nd biologic treatment process, and this excess sludge treatment process is carried out under the condition of pH5～6.

The 3rd aspect relates to the bioremediation and the device of organic drainage; It is characterized in that; Organic drainage is being imported first biologic treatment process; Carry out a biological disposal upon through non-compendency bacterium; To contain treating water from the non-compendency bacterium of this first biologic treatment process and import in bioremediation that second biologic treatment process carries out active sludge treatment and the device, the mud of this second biologic treatment process of solid-liquid separation or the mud of this second biologic treatment process import at least a portion of the mud that solid-liquid separation obtains in the anaerobic treatment operation; Carry out anaerobic treatment, the handled thing of this anaerobic treatment operation is back to said first biologic treatment process and/or second biologic treatment process.

The 4th aspect relates to the bioremediation and the device of organic drainage; It is characterized in that; Organic drainage is being imported first biologic treatment process; Carry out a biological disposal upon through non-compendency bacterium; To contain treating water from the non-compendency bacterium of this first biologic treatment process and import second biologic treatment process and carry out in the bioremediation of active sludge treatment, the mud of this second biologic treatment process of solid-liquid separation or the mud of this second biologic treatment process import at least a portion of the mud that solid-liquid separation obtains in the aerobic treatment operation; Oxidation under aerobic conditions; In the anaerobic treatment operation, import at least a portion of the handled thing of this aerobic treatment operation, carry out anaerobic treatment, the handled thing of this anaerobic treatment operation is back to the operation more than 1 road that is selected from said first biologic treatment process, second biologic treatment process and the aerobic treatment operation.

The 5th aspect relates to the bioremediation and the device of organic drainage; It is characterized in that,, utilize bacterium to carry out a biological disposal upon organic drainage being imported the 1st biologic treatment process; To contain treatment solution from the bacterium of the 1st biologic treatment process imports the 2nd biologic treatment process and carries out active sludge treatment; Solid-liquid separation is separated into mud and treating water from the treatment solution of the 2nd biologic treatment process, in the bioremediation that the part of this mud is back to the 2nd biologic treatment process and the device; In the 3rd biologic treatment process, import the part of the mud in the 2nd biologic treatment process and/or the remainder of the mud after the processing of said solid-liquid separation; After carrying out aerobic treatment, dehydration is separated into solid shape and divides and moisture partly or entirely through the mud of aerobic treatment; To consolidate shape and divide, moisture will be back to said the 1st biologic treatment process and/or the 2nd biologic treatment process as the excess sludge discharge.

The 6th aspect relates to the bioremediation and the device of organic drainage; It is characterized in that; Organic drainage is being imported the 1st biological treating tank; Utilize bacterium to carry out a biological disposal upon, will contain treatment solution from the bacterium of the 1st biological treating tank and import in bioremediation that the 2nd biological treating tank carries out active sludge treatment and the device, the detention time of mud of the 2nd biological treating tank was controlled at 5～40 days.

The 7th aspect relates to the bioremediation and the device of organic drainage; It is characterized in that; For organic drainage being imported the 1st biological treating tank; Utilize bacterium to carry out a biological disposal upon, will contain treatment solution from the non-compendency bacterium of the 1st biological treating tank and import the 2nd biological treating tank and carry out active sludge treatment, solid-liquid separation is from mud in the 2nd biological treating tank; In the 3rd biological treating tank, import the mud that solid-liquid separation obtains; Under aerobic conditions carry out oxide treatment, with this partly or entirely the handled thing of the 3rd biological treating tank be back to the bioremediation and the device of the 2nd biological treating tank, the detention time of mud of the 2nd biological treating tank and the 3rd biological treating tank was controlled at 5～40 days separately.

The 8th aspect relates to the bioremediation and the device of organic drainage; It is characterized in that; Handle BOD in the organic drainage so that in the bioremediation and device of its thalline that is converted into the 1st biologic treatment process of thalline and makes conversion and the organic drainage of the 2nd biologic treatment process of the animalcule coexistence of this thalline of predation having high loading; Obtain as being converted into the thalline waterpower residence time (HRT) required, in said the 1st biologic treatment process more than or equal to 70% less than 100% BOD in the said organic drainage of standard; Be worth as standard HRT with this; Add liquid in the said organic drainage that in the 1st biologic treatment process, imports, so that the HRT in said the 1st biologic treatment process reaches 0.75～1.5 times the scope of this standard HRT.

The 9th aspect relates to the bioremediation and the device of organic drainage; It is characterized in that; Handle BOD in the organic drainage so that in the bioremediation and device of its thalline that is converted into the 1st biologic treatment process of thalline and makes conversion and the organic drainage of the 2nd biologic treatment process of the animalcule coexistence of this thalline of predation having high loading; Obtain as being converted into the thalline waterpower residence time (HRT) required, in said the 1st biologic treatment process more than or equal to 70% less than 100% BOD in the said organic drainage of standard; Be worth as standard HRT with this; Make the water yield change in the treatment trough that carries out the 1st biologic treatment process, so that the HRT in said the 1st biologic treatment process reaches 0.75～1.5 times the scope of this standard HRT.

In the 8th, aspect 9, " as the organic drainage of standard " is meant the organic drainage of being carried out a biological disposal upon, that is, flow, temperature, BOD concentration through the time change organic drainage, as the temperature of standard, the organic drainage of BOD concentration.This temperature as standard, BOD concentration implication are following.

Standard temperature: comprise minimum temperature when heating, in a year.

Standard BOD concentration: the maximum BOD concentration that flows into the draining of the 1st biologic treatment process.

Description of drawings

[Fig. 1] is the schema of the embodiment of the bioremediation of the organic drainage that relates to of expression the 1st aspect of the present invention.

[Fig. 2] is the schema of other embodiments of the bioremediation of the organic drainage that relates to of expression the 2nd aspect of the present invention.

[Fig. 3] is the schema of other embodiments of expression excess sludge treatment process.

[Fig. 4] Fig. 4 a is the schema of the experimental installation of use among the expression embodiment 1, and Fig. 4 b is the schema of the experimental installation of use among the expression embodiment 2.

[Fig. 5] figure for concerning between the BOD amount that drops in expression embodiment 1,2 and the comparative example 1,2 and the excess sludge generation.

[Fig. 6] is the schema of the embodiment of the bioremediation of the organic drainage that relates to of expression the 3rd aspect of the present invention.

[Fig. 7] is the schema of other embodiments of the bioremediation of the organic drainage that relates to of expression the 3rd aspect of the present invention.

[Fig. 8] is the schema of other embodiments of the bioremediation of the organic drainage that relates to of expression the 3rd aspect of the present invention.

[Fig. 9] is the schema of the embodiment of the bioremediation of the organic drainage that relates to of expression the 4th aspect of the present invention.

[Figure 10] is the schema of other embodiments of the bioremediation of the organic drainage that relates to of expression the 4th aspect of the present invention.

[Figure 11] is the schema of the experimental installation of use in the expression comparative example 3,5.

[Figure 12] is the schema of the experimental installation of use in the expression comparative example 4,6.

[Figure 13] figure for concerning between the BOD amount that drops in expression embodiment 3,6,7 and the comparative example 3,4 and the excess sludge generation.

[Figure 14] is the schema of the embodiment of the bioremediation of the organic drainage of expression the 5th aspect of the present invention.

[Figure 15] is the schema of other embodiments of the bioremediation of the organic drainage of expression the 5th aspect of the present invention.

[Figure 16] figure for concerning between the BOD amount that drops in expression embodiment 8,9 and the comparative example 5,6 and the excess sludge generation.

[Figure 17] is the schema of the embodiment of the bioremediation of expression organic drainage of the present invention.

[Figure 18] is the figure through daily variation of the animalcule number in the 2nd biological treating tank in expression embodiment 10 and the comparative example 8.

[Figure 19] is the figure through daily variation of mud transformation efficiency in expression embodiment 10 and the comparative example 8.

[Figure 20] is the schema of the embodiment of the bioremediation of expression organic drainage of the present invention.

[Figure 21] is the schema of other embodiments of the bioremediation of expression organic drainage of the present invention.

[Figure 22] is the schema of other embodiments of the bioremediation of expression organic drainage of the present invention.

[Figure 23] is the schema of the different embodiments of the bioremediation of expression organic drainage of the present invention.

[Figure 24] is for concerning the figure of (before the load change) between the BOD amount that drops in

expression embodiment

12,13 and the comparative example 9,10 and the excess sludge generation.

[Figure 25] is for concerning the figure of (behind the load change) between the BOD amount that drops in

expression embodiment

12,13 and the comparative example 9,10 and the excess sludge generation.

Embodiment

[the 1st and the 2nd aspect]

If utilize the acidic region of single-channel type activated sludge process below pH6 in the past to carry out the aerobism processing of organic drainage, then mushroom produces in a large number, becomes the reason of sludge bulking.But; As the inventive method; In the neutral region of pH6～8, carry out BOD is converted into the 1st biologic treatment process of disperseing thalline; In the acidic region of pH5～6, be used to reduce the 2nd biologic treatment process or the excess sludge treatment process of mud, can significantly reduce the mud generation thus.Its reason is following; Promptly; The 2nd biologic treatment process through making tiny organism coexistence or the pH of excess sludge treatment process are 5～6; Can prey on efficiently from the non-aggegation mud and the aggegation mud that carry out the 1st biologic treatment process that BOD handles, if on the other hand since the propagation of the most tiny organism of participating in preying in the scope of pH5～8, the influence that then not caused by pH; Therefore in the 2nd biologic treatment process or excess sludge treatment process, can the ratio that tiny organism among the VSS is shared be increased to the high density more than 10%.

According to the 1st and the 2nd aspect; Through the 1st biologic treatment process that is used for treatments B OD and the 2nd biologic treatment process or the excess sludge treatment process that are used to reduce mud; According to the condition of optimizing the environment of function separately; The function of the two is brought into play to greatest extent, can be realized the raising of processing efficiency and the reduction of excess sludge generation thus.

In aspect the 1st, the 2nd biologic treatment process comprises the multiple-stage treatment operation more than 2 grades, in the 2nd biologic treatment process, also can after the biological treatment of pH5～6, carry out the biological treatment more than the pH6.

In aspect the 2nd; The excess sludge treatment process can be provided with equipment for separating liquid from solid for the back one-level at biological treating tank; With solid-liquid separation mud be back to the sludge return type biologic treatment process of this biological treating tank, also can be the fluidized bed type biologic treatment process of in biological treating tank, having added carrier.

No matter in aspect the 1st or the 2nd; The 2nd biologic treatment process can be that the back one-level at biological treating tank is provided with equipment for separating liquid from solid; With solid-liquid separation mud be back to the sludge return type biologic treatment process of this biological treating tank; In biological treating tank, added the fluidized bed type biologic treatment process of carrier; In the membrane sepn formula biologic treatment process any also can be carried out the 1st biologic treatment process through fluidized bed type biological treatment or the multiple-stage treatment more than 2 grades that in biological treating tank, has added carrier.

Utilize the bioremediation and the device of the organic drainage of the 1st and the 2nd aspect; In the multistage activated sludge process of the predation that has utilized tiny organism; When having kept stable treated water, can realize the further raising of processing efficiency and the minimizing of excess sludge generation.

Followingly the preferred implementation of the 1st and the 2nd aspect is carried out detailed explanation with reference to accompanying drawing.

Fig. 1 is the schema of an embodiment of the bioremediation of the organic drainage that relates to of expression the 1st aspect of the present invention, the schema of an embodiment of the bioremediation of the organic drainage that Fig. 2 relates to for expression the 2nd aspect of the present invention.

In the method for Fig. 1, former water (organic drainage) at first is imported into first biological treating tank (disperseing the bacterium groove) 1, and more than 70% of BOD (organic composition), hope are more than 80%, more hope to be to be decomposed by non-compendency bacterial oxidation more than 90%.The pH that controls this first biological treating tank 1 hopes in pH6～8 more than 6.Through making the BOD volumetric loading in first biological treating tank 1 is 1kg/m ³More than/the d, 1～20kg/m for example ³/ d makes HRT (former hydropexis time) for below the 24h, and for example 0.5～24h can obtain the dominant treating water of non-compendency bacterium.But handle the low draining of BOD concentration through shortening HRT high loading ground, therefore preferred.Can realize high loading, shorten the direct current time through adding carrier.

The treating water of first biological treating tank 1 is imported pH to be controlled at 5～6, to hope to be controlled at second biological treating tank (tiny organism groove) 2 in 5～5.5 the scope; At this, carry out oneself's decomposition of the oxygenolysis of residual organic composition, non-compendency bacterium and the predation of carrying out through tiny organism and reduce mud.

In the method for Fig. 1, make second biological treating tank 2 for multistage, series connection is provided with the above biological treating tank of 2 grooves; In the biological treating tank of previous stage one side; Be 5～6 at pH, hope that pH handles under 5～5.5 the condition, also can be in the biological treating tank of back one-level one side, at pH be 6 or more, preferably pH handles under 6～6.8 the condition; Through this multiple-stage treatment; Can in the biological treating tank of previous stage one side, carry out the predation of mud effectively, in the biological treating tank of back one-level one side, improve the solid-liquid separation property of mud, improve treating water water quality.

The treating water of second biological treating tank 2 in settling bath 3 through solid-liquid separation, divide dried up be exhausted from system as treating water outside.The part of separated sludge is discharged to outside the system as excess sludge, and remainder is back to first biological treating tank 1 and second biological treating tank 2.What should explain is; The backflow of this mud is carried out for the sludge quantity of keeping in each biological treating tank; But the situation that does not need returned sluge is also arranged, for example make first biological treating tank 1 and/or second biological treating tank 2 just not need returned sluge when stating the fluidized bed type of carrier after being added with.When the BOD volumetric loading of first biological treating tank 1 hanged down, mud can only be back to second biological treating tank 2.

In the method for Fig. 2; Former water (organic drainage) is controlled in more than the pH6 by importing successively jointly, first biological treating tank 1 and second biological treating tank 2 of pH6～8; With the method for Fig. 1 likewise; In first biological treating tank 1, utilize non-compendency bacterium with more than 70% of organic composition, hope 80% or more, more to hope 90% oxygenolysis, in second biological treating tank 2, carry out oneself's decomposition of the oxygenolysis of residual organic composition, non-compendency bacterium and the predation of carrying out through tiny organism then and reduce mud.The treating water of second biological treating tank 2 by solid-liquid separation, divides dried uply to be discharged to outside the system as treating water in settling bath 3.At least a portion of the generation mud that is generated by this second biological treating tank 2 is (among Fig. 2; Import the part of separated sludge of settling bath 3 of the treating water of second biological treating tank 2) be back to pH and be controlled as the excess sludge treatment trough 4 in 5～6, preferred 5～5.5 the scope, being decomposed through aerobism digestion at this.The processing mud of this excess sludge treatment trough 4 is back to first biological treating tank 1 and/or second biological treating tank 2.In Fig. 2, in the remainder of the separated sludge of settling bath 3, a part is discharged to outside the system as excess sludge, and remainder is back to second biological treating tank 2.

In the separated sludge of settling bath 3, deliver to the sludge quantity of excess sludge treatment trough 4 and the ratio of the sludge quantity that is back to second biological treating tank 2 and come suitable setting, so that the preferred excess sludge treatment trough residence time of stating after can keeping according to the mud generation.Be back to the ratio of the sludge quantity of first, second biological treating tank 1,2 in the processing mud of excess sludge treatment trough 4, perhaps being back to which biological treating tank can suitably set, so that can keep the mud maintenance dose of each biological treating tank.

In this excess sludge treatment trough 4, when the early stage or mud generation of device running is high, also can drop into the half the of the total amount that produces mud.This excess sludge treatment trough 4 not only has the effect that reduces mud, also has the effect of in second biological treating tank 2, supplying with tiny organism.

The detention time of mud of excess sludge treatment trough 4 is more than the 6h; Hope for more than the 12h; Like 12～240h; But, can further improve detention time of mud through for example implementing as shown in Figure 3 settling bath 4B to be set and mud is back to the aerobic treatment method of excess sludge treatment trough 4A, the fluidized-bed that has added carrier or membrane sepn formula aerobic treatment method.As the carrier of excess sludge treatment trough 4, can use the carrier of conduct first biological treating tank of back narration.

In Fig. 1, any method of 2, a large amount of residual when organism is arranged in the treating water of first biological treating tank 1 that is imported into second biological treating tank 2, its oxygenolysis is all carried out in second biological treating tank 2.If in a large amount of second biological treating tanks 2 that exist of tiny organism bacterial organic oxygenolysis takes place; Then as the countermeasure of escaping the predation of tiny organism; Knownly breed with the mode that is difficult to prey; The bacterial flora of propagation can not preyed on by tiny organism like this, and their decomposition only depends on self-digestion, can reduce the effect that the mud generation reduces.In the methods of the invention, set second biological treating tank 2 or excess sludge treatment trough 4 at acidic region, a large amount of when residual when organism, mushroom etc. utilize this organism propagation, cause sludge bulking.

Therefore, as stated, in first biological treating tank 1, need to decompose in advance most of organism, more than 70% of promptly former water BOD hopes more to hope 90%, to be converted into thalline more than 80%.Therefore, if represent with the solvability BOD sludge loading in second biological treating tank 2, running is preferably below 0.5kg-BOD/kg-MLSS/d, for example 0.01～0.1kg-BOD/kg-MLSS/d carries out.

Fig. 1,2 method representation an example of the 1st, the 2nd aspect, as long as the 1st, the 2nd aspect does not exceed its main idea, be not limited to any illustrated method.

For example, for high loading is handled, except the part of the separated sludge of the settling bath of the back one-level that refluxes, first biological treating tank also can adopt the fluidized-bed mode that is added with carrier, or series connection the above biological treating tank of 2 grooves be set carry out multiple-stage treatment.Particularly, also can carry out BOD volumetric loading 5kg/m through adding carrier ³The above high loading of/d is handled, and is therefore preferred.At this moment, being shaped as of the carrier of interpolation is spherical, particulate state, hollow tube-shape, random shape such as thread, and size also can be the diameter about 0.1～10mm.The material of carrier is any material such as natural material, inorganic raw material, polymer starting material, also can use spawn.

Decompose owing in second biological treating tank 2, utilize than the effect of the slow-footed tiny organism of bacterial multiplication and the oneself of bacterium; Therefore adopt tiny organism and bacterium to be trapped in intrasystem operating condition and treatment unit is important; For this reason, second biological treating tank is like Fig. 1, shown in 2, except the sludge return type biological treatment of carrying out returned sluge; Also hope to state embodiment behind the picture, the dipping separatory membrane carries out the active processing of membrane sepn formula in groove.

Through in aerator tank, adding maintenance dose in the groove that carrier can improve tiny organism.Carrier as this moment can use and the aforementioned same carrier of carrier that is added in first biological treating tank.

The embodiment of the 1st and the 2nd aspect and comparative example

Enumerate embodiment and comparative example below the 1st and the 2nd aspect more specifically is described.

Embodiment 1

Shown in Fig. 4 a; Use to be connected with as the capacity of first biological treating tank 11, carry out the processing of organic drainage (BOD630mg/L) as the activated sludge tank (not returned sluge) of 3.6L with as the capacity of second biological treating tank 12 experimental installation as the dipping membrane type activated sludge tank of 15L.In second biological treating tank 12, impregnated membranes 12a is set, takes out the permeate water of this impregnated membranes 12a as treating water.

The pH that regulates first biological treating tank 11 respectively is that the pH of 6.8, second biological treating tank 12 is 5.0.

Table 1 shows the result of experiment beginning after 4 months.Excess sludge generation (mud transformation efficiency) with respect to dropping into BOD is as shown in Figure 5.

In the present embodiment, operating condition is: the solvability BOD volumetric loading in first biological treating tank 11 is 3.5kg-BOD/m ³/ d, HRT are 4h, and the solvability BOD sludge loading of second biological treating tank 12 is that 0.022kg-BOD/kg-MLSS/d, HRT are 17h, and whole BOD volumetric loading is 0.75kg-BOD/m ³/ d, HRT are 21h, and the mud transformation efficiency is 0.1kg-MLSS/kg-BOD as a result, and treating water BOD is below the detectability.

Embodiment 2

Shown in Fig. 4 b; Use be connected with as the capacity of first biological treating tank 11 as the activated sludge tank (not returned sluge) of 3.6L, as the capacity of second biological treating tank 12 as the dipping membrane type activated sludge tank of 15L and capacity as the experimental installation of the excess sludge treatment trough 13 of 1L, carry out the processing of organic drainage (BOD630mg/L).The same with Fig. 4 a, in second biological treating tank 12, impregnated membranes 12a is set, take out the permeate water of this impregnated membranes 12a as treating water.

The pH of first biological treating tank 11 and second biological treating tank 12 all is adjusted to 6.8, is 5.0 with the pH regulator of excess sludge treatment trough 13.From second biological treating tank 12,, import excess sludge treatment trough 13, from this residue treatment trough 13,, it is back to second biological treating tank 12 with mud in the ratio drain tank of 0.5L/d with mud in the ratio drain tank of 0.5L/d.The residence time of excess sludge treatment trough 13 is SRT=HRT=10 days.

In the present embodiment, operating condition is: the solvability BOD volumetric loading in first biological treating tank 11 is 3.85kg-BOD/m ³/ d, HRT are 4h, and the solvability BOD sludge loading of second biological treating tank 12 is that 0.022kg-BOD/kg-MLSS/d, HRT are 17h, and whole BOD volumetric loading is 0.75kg-BOD/m ³/ d, HRT are 21h, and the mud transformation efficiency is 0.11kg-MLSS/kg-BOD as a result, and treating water BOD is below the detectability.

Comparative example 1

In embodiment 1, omit first biological treating tank, use the capacity that only comprises second biological treating tank experimental installation as the dipping membrane type activated sludge tank of 15L, carry out the processing of organic drainage (BOD630mg/L).Table 1 shows the result of experiment beginning after 4 months.Excess sludge generation (mud transformation efficiency) with respect to dropping into BOD is as shown in Figure 5.

In this comparative example, operating condition is: solvability BOD volumetric loading is 0.76kg-BOD/m ³/ d, HRT are 20h, and the result is as shown in table 1, though treating water water quality is good, the mud transformation efficiency is 0.40kg-MLSS/kg-BOD.

Comparative example 2

The pH of first biological treating tank and second biological treating tank all is adjusted to 6.8, and in addition, other operations are identical with embodiment 1, carry out the processing of organic drainage (BOD630mg/L).Table 1 shows the result of experiment beginning after 4 months.Excess sludge generation (mud transformation efficiency) with respect to dropping into BOD is as shown in Figure 5.

In this comparative example, operating condition is: the solvability BOD volumetric loading in first biological treating tank 11 is 3.85kg-BOD/m ³/ d, HRT are 4h, and the solvability BOD sludge loading of second biological treating tank 12 is that 0.022kg-BOD/kg-MLSS/d, HRT are 17h, and whole BOD volumetric loading is 0.75kg-BOD/m ³/ d, HRT are 21h, and the result is as shown in table 1, though treating water water quality is good, the mud transformation efficiency is 0.2kg-MLSS/kg-BOD.

Table 1

The result of embodiment 1,2 and comparison 1,2 is following.

Comparative example 1 has been implemented activated sludge process in the past, and comparative example 2 has been implemented the processing that utilizes the multi-stage biological facture to carry out, and this multi-stage biological facture does not add the biologic treatment process in the acidic region.Mud transformation efficiency in the activated sludge process in the past (comparative example 1) is 0.40kg-MLSS/kg-BOD, and as shown in the comparative example 2, handles through importing multi-stage biological, and the mud transformation efficiency becomes 0.20kg-MLSS/kg-BOD, can reduce mud generation 1/2.It is identical with the degree of the multi-stage biological facture of reporting so far that this mud reduces effect.

On the other hand; As the present invention in the embodiment that has imported the biologic treatment process in the acidic region 1,2; The mud transformation efficiency is 0.10,0.11kg-MLSS/kg-BOD; Compare with previous methods, the mud generation can be reduced to 1/4, compares the mud generation with multi-stage biological facture in the past and can be reduced to 1/2.

[the 3rd and the 4th aspect]

In aspect the 3rd; Utilize under anaerobic that the effect of Anaerobic Bacteria makes that the mud of second biologic treatment process (animalcule groove) from the predation that disperses bacterium can dissolve, organic oxidation, sex change; Disperse bacteriumization once more and/or supply the animalcule predation; Can improve processing efficiency thus, reduce the excess sludge generation, wherein said dispersion bacterium is from carrying out first biologic treatment process (disperseing the bacterium groove) that organism is removed.

In aspect the 4th, process aerobic treatment operation before this anaerobic treatment operation, so shared animalcule ratio increases in the mud, mud can be dissolved in the anaerobic treatment operation of back one-level.

Therefore; Bioremediation according to the organic drainage of the 3rd and the 4th aspect; In the multistage activated sludge process of the predation that utilizes animalcule, can when keeping stable treated water, realize the further raising of processing efficiency and the reduction of excess sludge generation.

The optimal way of the 3rd and the 4th aspect at length is described with reference to the accompanying drawings.

Fig. 6～8 are the schema of the embodiment of the bioremediation of the organic drainage that relates to of expression the 3rd aspect of the present invention and device, Fig. 9,10 schemas for the embodiment of the bioremediation of representing the organic drainage that the 4th aspect of the present invention relates to.In Fig. 6～10, to playing the member mark prosign of same function.

In the method and apparatus of Fig. 6, former water (organic drainage) at first is imported into first biological treating tank (disperseing the bacterium groove) 1, and more than 70% of BOD (organic composition), hope are more than 80%, more hope to be to be decomposed by non-compendency bacterial oxidation more than 90%.The pH that controls this first biological treating tank hopes in pH6～8 more than 6.Through making the BOD volumetric loading in first biological treating tank 1 is 1kg/m ³More than/the d, 1～20kg/m for example ³/ d makes HRT (former hydropexis time) for below the 24h, and for example 0.5～24h can obtain the dominant treating water of non-compendency bacterium.But handle the low draining of BOD concentration through shortening HRT high loading ground, therefore preferred.Can realize high loading, shorten the direct current time through adding carrier.

The treating water of first biological treating tank 1 is imported pH to be controlled at 6, to hope to be controlled at second biological treating tank (tiny organism groove) 2 in 6～8 the scope; At this, carry out oneself's decomposition of the oxygenolysis of residual organic composition, non-compendency bacterium and the predation of carrying out through tiny organism and reduce mud.

Decompose owing in second biological treating tank 2, utilize, therefore must use animalcule and bacterium to be trapped in intrasystem operating condition and treatment unit than effect of the slow-footed animalcule of bacterial multiplication and the oneself of bacterium.Therefore hope to use and in second biological treating tank 2, carry out activated sludge process or the membrane sepn formula activated sludge process that mud refluxes.More hope through in aerator tank, adding maintenance dose in the groove that carrier improves animalcule.

As shown in Figure 7, in Fig. 6 method, make second biological treating tank 2 for multistage; Series connection is provided with 2 grooves above biological treating tank 2A, 2B; In previous stage treatment trough 2A, be 5～6 at pH, hope that pH handles under 5～5.5 the condition, also can be in the one-level treatment trough 2B of back; At pH be more than 6, preferred pH handles under 6～8 the condition; Through this multiple-stage treatment, can in previous stage treatment trough 2A, carry out the predation of mud effectively, in the one-level treatment trough 2B of back, can realize the raising of the solid-liquid separation property of mud, the raising of treating water water quality.The method of Fig. 7 only with among Fig. 6 makes second biological treating tank, 2 multipolarity this point different, and other adopt same formation.What should explain is; In order to reduce the mud generation in second biological treating tank 2; Also can equally be provided with at interval, and in the single groove as Fig. 6 as, the pH of second biological treating tank 2 is set in below 6, but at this moment need neutralize before discharging treating water unlike Fig. 7.

The treating water of second biological treating tank 2 in settling bath 3 through solid-liquid separation, divide dried up be exhausted from system as treating water outside.The part of separated sludge is discharged to outside the system as excess sludge, and a part is back to second biological treating tank 2, and remainder is sent to oxyphobe digestive shelf 24.As long as second biological treating tank 2 of separated sludge and the return sludge ratio rate of oxyphobe digestive shelf 24 can be kept the detention time of mud in the following oxyphobe digestive shelf 24, can change arbitrarily according to the mud generation.

In aspect the 3rd; In oxyphobe digestive shelf 24, import animalcule and carried out disperseing at least a portion of the mud that the mud in second biological treating tank 2 of predation of bacterium perhaps obtains its solid-liquid separation, under anaerobic carry out the dissolving of mud, organic oxidation, sex change to rudimentary organic acid or lower alcohol.Therefore, also can in oxyphobe digestive shelf 24, import the mud of discharging from second biological treating tank 2 and not import the separated sludge of settling bath 3.

The shared ratio height of animalcule in the mud accounts for more than 5% of SS at least in second biological treating tank 2, can account for more than 30% according to operating condition.Compare with bacterium animalcule under anaerobic easily dead, can be dissolved, generated the bacterium organic oxidation by acid, so the detention time of mud in the oxyphobe digestive shelf 24 (SRT) is more than 0.5 day, for example 0.5～5 day is enough.For the organic acid that prevents to generate in the oxyphobe digestive shelf 24 is converted into methane with alcohol because methane generates the effect of bacterium; Therefore hope in oxyphobe digestive shelf 24, to make pH to be 6.0 below, to hope to be below 5.5, as 5～5.5, perhaps with temperature be set at below 30 ℃, hope is set at below 25 ℃, as 20～25 ℃.But, the organism that is converted into organic acid, alcohol is converted into methane and as energy recovery or when disposing, the pH that also can make oxyphobe digestive shelf 24 is more than 6.0, or temperature is more than 30 ℃.Through the oxyphobe in this oxyphobe digestive shelf 24 digestion, the animalcule in second biological treating tank 2, food at large and residual bacterium is converted into organic acid, alcohol.As the also sex change or be segmented in this oxyphobe digestive shelf 24 of unbated composition in second biological treating tank 2 of other the excrement, corpse, bacterium etc. of animalcule of SS composition; Perhaps be converted into the thalline of Anaerobic Bacteria, therefore become and to be preyed on by animalcule.

In Fig. 6,7, the handled thing of this oxyphobe digestive shelf 24 directly is back to first biological treating tank 1 and/or second biological treating tank 2.

The handled thing of this oxyphobe digestive shelf 24; Also can be as shown in Figure 8, solid-liquid separation in equipment for separating liquid from solid such as thickner or water extracter 25, the branch dried up (anaerobic treatment water) that will contain organic acid and alcohol is back to first biological treating tank 1; Be converted into once more and disperse bacterium; To consolidate shape branch (mud) and be back to second biological treating tank 2, and make it further to be reduced mud thus by the animalcule predation.At this moment, the discharge of excess sludge can be carried out from settling bath 3, also can carry out from the equipment for separating liquid from solid 25 of the back one-level of oxyphobe digestive shelf 24.The solid shape branch with solid-liquid separation in this equipment for separating liquid from solid 25 all is not back to second biological treating tank 2, and returns oxyphobe digestive shelf 24 once again, in oxyphobe digestive shelf 24, can carry out the digestion of high density oxyphobe thus, prolongs SRT, can promote and can dissolve.Also the such equipment for separating liquid from solid of thickner can be set,, perhaps carry out solid-liquid separation or high density digestion through adding carrier through in oxyphobe digestive shelf 24, impregnated membranes being set.

The method shown in Figure 9 method with shown in Figure 6 on the previous stage this point that aerobism digestive shelf 26 is arranged on oxyphobe digestive shelf 24 is different, and the processing in first biological treating tank 1, second biological treating tank 2, settling bath 3 and the oxyphobe digestive shelf 24 is likewise carried out.

In aspect the 4th; At least a portion of the mud that in aerobism digestive shelf 26, imports the mud in second biological treating tank 2 or its solid-liquid separation is obtained; Below the pH6, hope for carrying out aerobism digestion under the condition of pH5～5.5; At least a portion of handling mud and treating water is delivered to oxyphobe digestive shelf 24, makes under anaerobic that it can dissolve, organic oxidation, sex change.At this moment, if the return sludge ratio rate to the aerobism digestive shelf 26 and second biological treating tank 2 of separated sludge can keep below shown in the detention time of mud in aerobism digestive shelf 26, can change arbitrarily according to the mud generation.

In Fig. 9; Aerobism digestive shelf 26 not only has the effect that reduces mud, also has following advantage, promptly passes through this aerobism digestive shelf 26; The shared ratio of animalcule becomes higher in the mud, and the dissolving of mud in back one-level oxyphobe digestive shelf 24 becomes easier.The detention time of mud of aerobism digestive shelf 26 is more than 12 hours; Hope is more than 24 hours; For example 24～240 hours; But, can further increase detention time of mud through aerobic treatment method that the equipment for separating liquid from solid returned sluge is set or the fluidized-bed and the membrane sepn formula aerobic treatment method of adding carrier.Also can directly will be back to second biological treating tank 2 without oxyphobe digestive shelf 24 from the part of the mud of aerobism digestive shelf 26, also beneficial for replenishing of the animalcule of second biological treating tank 2 thus.

That equipment for separating liquid from solid 25 this point are set is different for the back one-level at oxyphobe digestive shelf 24 as shown in Figure 8 in method shown in Figure 10 and the method for Fig. 9, equally with Fig. 8 carries out the solid-liquid separation of the handled thing of oxyphobe digestive shelf 24, the backflow that divides dried up and separated sludge.At this, the separated sludge of equipment for separating liquid from solid 25 also can further be back to aerobism digestive shelf 26.

The method representation of Fig. 6～10 example of the 3rd and the 4th aspect, as long as the 3rd, the 4th aspect do not exceed its main idea, be not limited to any illustrated method.

For example, for high loading is handled, except the part of the separated sludge of the settling bath that is back to the back one-level, first biological treating tank also can adopt the fluidized-bed mode that is added with carrier, or series connection the above biological treating tank of 2 grooves be set carry out multiple-stage treatment.Particularly, also can carry out BOD volumetric loading 5kg/m through adding carrier ³The above high loading of/d is handled, and is therefore preferred.At this moment, being shaped as of the carrier of interpolation is spherical, particulate state, hollow tube-shape, random shape such as thread, and size also can be the diameter about 0.1～10mm.The material of carrier is any material such as natural material, inorganic raw material, polymer starting material, also can use spawn.Decompose owing in second biological treating tank 2, utilize than effect of the slow-footed animalcule of bacterial multiplication and the oneself of bacterium; Therefore adopt animalcule and bacterium to be trapped in intrasystem operating condition and treatment unit is important; For this reason; Second biological treating tank except the sludge return type biological treatment of carrying out returned sluge, hopes that also the dipping separatory membrane carries out the active processing of membrane sepn formula in groove shown in Fig. 6～10.More hope through in aerator tank, adding maintenance dose in the groove that carrier can improve animalcule.Carrier as this moment can use and the aforementioned same carrier of carrier that is added in first biological treating tank.

In draining is handled, except from the mud of biological treatment also by the floating generation mud such as groove of going up of initial settling tank, pressurization.When they have been carried out anaerobic treatment, be easy to decompose with comparing from the mud of biological treatment, therefore the organic acid that dissolves, is converted into more than 50% is possible.The composition that cannot not dissolve also is segmented, and can be preyed on by animalcule.Therefore; In the 3rd, aspect the 4th; In the anaerobic treatment operation (oxyphobe digestive shelf) of the mud that imports second biological treating tank, add primary sludge, the floating mud of going up of pressurization, the SS composition that the animalcule predation cannot not be dissolved also can reduce the surplus sludge volume of discharging from whole factory thus.

3rd, the embodiment of the 4th aspect and comparative example

Enumerate embodiment and comparative example below the 3rd, the 4th aspect more specifically is described.

Embodiment 3

As shown in Figure 6; The capacity of use is first biological treating tank (activated sludge tank (not returned sluge)) 1 of 3.6L, capacity second biological treating tank (activated sludge tank) 2 and settling bath 3 as 15L; With capacity is the experimental installation that the oxyphobe digestive shelf 24 of 1L is connected, and carries out the processing of organic drainage of the present invention (BOD630mg/L).The pH that regulates first biological treating tank 1 respectively is that the pH of 6.8, second biological treating tank 2 is 6.8, the pH of oxyphobe digestive shelf 24 is 6.0.Under following condition, turn round: the solvability BOD volumetric loading in first biological treating tank 1 is 3.85kg-BOD/m ³/ d, HRT are 4h, and the solvability BOD sludge loading in second biological treating tank 2 is that 0.022kg-BOD/kg-MLSS/d, HRT are 17h, and whole BOD volumetric loading is 0.75kg-BOD/m ³/ d, HRT are 21h.

SS in second biological treating tank 2 is 5000mg/L, and the mud of from settling bath 3, discharging is concentrated into 10000mg/L.Ratio with 250ml/d is discharged this thickened sludge, is added into oxyphobe digestive shelf 24.250ml/d is expelled to outside the system as excess sludge, all remaining mud are back to second biological treating tank 2.The HRT and the SRT of oxyphobe digestive shelf 24 are set at 4 days, the processing mud of oxyphobe digestive shelf 24 is back to second biological treating tank 2.

After the continuous operation 4 months, the solvability BOD concentration in the treating water of oxyphobe digestive shelf 24 is 4000mg-BOD/L under this condition, and acetic acid accounts for 55%, and propionic acid accounts for 40%.The mud transformation efficiency of being calculated by the sludge quantity of second biological treating tank, 2 discharges is 0.12kg-MLSS/kg-BOD.

Embodiment 4

As shown in Figure 7; Except making second biological treating tank 2 is the secondary activated sludge tank (5L+10L) of the previous stage treatment trough 2A of 5L and the back one-level treatment trough 2B that capacity is 10L for capacity; Use the experimental installation same, likewise carry out the processing of organic drainage (BOD630mg/L) with embodiment 3 with embodiment 3.What should explain is, is 5.0 with the pH regulator of previous stage treatment trough, is 6.8 with the pH regulator of back one-level treatment trough.Other conditions are identical with embodiment 3.

SS in second biological treating tank 2 is 5000mg/L, and the mud of from settling bath 3, discharging is concentrated into 10000mg/L.Discharge the 250ml/d of this thickened sludge, be added into oxyphobe digestive shelf 24.208ml/d is expelled to outside the system as excess sludge, all remaining mud are back to second biological treating tank 2.The HRT and the SRT of oxyphobe digestive shelf 24 are set at 4 days, the processing mud of oxyphobe digestive shelf 24 is back to second biological treating tank 2.

After the continuous operation 4 months, the solvability BOD concentration in the treating water of oxyphobe digestive shelf 24 is 6500mg-BOD/L under this condition, and acetic acid accounts for 55%, and propionic acid accounts for 35%.The mud transformation efficiency of being calculated by the sludge quantity of second biological treating tank, 2 discharges is 0.10kg-MLSS/kg-BOD.

Embodiment 5

As shown in Figure 9, except the previous stage at oxyphobe digestive shelf 24 is provided with the aerobism digestive shelf 26 of capacity 2L, use the experimental installation same with embodiment 3, likewise carry out the processing of organic drainage (BOD630mg/L) with embodiment 3.What should explain is, is 5.0 with the pH regulator of aerobism treatment trough.Other conditions are identical with embodiment 3.

SS in second biological treating tank 2 is 5000mg/L, and the mud of from settling bath 3, discharging is concentrated into 10000mg/L.The 250ml/d of this thickened sludge is added into aerobism digestive shelf 26, and the mud from aerobism digestive shelf 26 discharge equivalent is added into oxyphobe digestive shelf 24, and all remaining thickened sludges are back to second biological treating tank 2.The HRT and the SRT of aerobism digestive shelf 26 are set at 8 days.The HRT and the SRT of oxyphobe digestive shelf 24 are set at 4 days, the processing mud of oxyphobe digestive shelf 24 is back to second biological treating tank 2.

After the continuous operation 4 months, the solvability BOD concentration in the treating water of oxyphobe digestive shelf 24 is 6500mg-BOD/L under this condition, and acetic acid accounts for 55%, and propionic acid accounts for 35%.The mud transformation efficiency of being calculated by the sludge quantity (185ml/d) of second biological treating tank, 2 discharges is 0.09kg-MLSS/kg-BOD.

Embodiment 6

As shown in Figure 8, except the back one-level at oxyphobe digestive shelf 24 is provided with the equipment for separating liquid from solid 25, use the experimental installation same with embodiment 3, likewise carry out the processing of organic drainage (BOD630mg/L) with embodiment 3.The pH condition of each groove, loading condiction etc. are identical with embodiment 3.

SS in second biological treating tank 2 is 5000mg/L, and the mud of from settling bath 3, discharging is concentrated into 10000mg/L.The 250ml/d of this thickened sludge is added into oxyphobe digestive shelf 24, all remaining thickened sludges are back to second biological treating tank 2, need not discharge mud from first, second biological treating tank 1,2 thus can remain SS in the groove necessarily.The HRT of oxyphobe digestive shelf 24 is set at 4 days; Handled thing with equipment for separating liquid from solid 25 solid-liquid separation oxyphobe digestive shelfs 24; Treating water is back to first biological treating tank 1; Half of separated sludge is back to second biological treating tank 2,1/4 of separated sludge is back to oxyphobe digestive shelf 24,1/4 of separated sludge is discharged as excess sludge.

After the continuous operation 4 months, the solvability BOD concentration in the treating water of oxyphobe digestive shelf 24 is 4000mg-BOD/L under this condition, and acetic acid accounts for 55%, and propionic acid accounts for 40%.The mud transformation efficiency of being calculated by the sludge quantity of oxyphobe digestive shelf 24 discharges is 0.10kg-MLSS/kg-BOD.

Embodiment 7

Shown in figure 10, except the previous stage at oxyphobe digestive shelf 24 is provided with the aerobism digestive shelf 26 that capacity is 2L, use the experimental installation same with embodiment 6, likewise carry out the processing of organic drainage (BOD630mg/L) with embodiment 6.What should explain is, is 5.0 with the pH regulator of aerobism digestive shelf 26.Other conditions are identical with embodiment 6.

SS in first, second biological treating tank 1,2 is 5000mg/L, and the mud of from settling bath 3, discharging is concentrated into 10000mg/L.The 250ml/d of this thickened sludge is added into aerobism digestive shelf 26; Discharge the mud of equivalent from aerobism digestive shelf 26; Be added into oxyphobe digestive shelf 24; All remaining thickened sludges are back to second biological treating tank 2, and need not discharge mud from first, second biological treating tank 1,2 thus can remain SS in the groove necessarily.The HRT and the SRT of aerobism digestive shelf 26 are set at 8 days.The HRT of oxyphobe digestive shelf 24 was made as 4 days; Processing mud with equipment for separating liquid from solid 25 solid-liquid separation oxyphobe digestive shelfs 24; Treating water is back to first biological treating tank 1; Half that solid shape is divided is back to second biological treating tank 2, and remaining 3/8 is back to oxyphobe digestive shelf 24, discharges as excess sludge remaining 1/8.

After the continuous operation 4 months, the solvability BOD concentration in the treating water of oxyphobe digestive shelf 24 is 6500mg-BOD/L under this condition, and acetic acid accounts for 55%, and propionic acid accounts for 35%.The mud transformation efficiency of being calculated by the sludge quantity of oxyphobe digestive shelf 24 discharges is 0.07kg-MLSS/kg-BOD.

Comparative example 3

Shown in figure 11, use has the biological treating tank (activated sludge tank) 2 ' of capacity 15L and the experimental installation of settling bath 3, carries out the processing of organic drainage (BOD630mg/L).Continuous operation is 4 months under following condition: the solvability BOD volumetric loading of biological treating tank 2 ' is 0.76kg-BOD/m ³/ d, HRT are 20h, pH6.8, though result's treating water is good, the mud transformation efficiency is 0.40kg-MLSS/kg-BOD.

Comparative example 4

Shown in figure 12, except having omitted oxyphobe digestive shelf 24, use the experimental installation same with embodiment 3, likewise carry out the processing of organic drainage (BOD630mg/L) with embodiment 3.The pH condition of each groove, loading condiction etc. are the same with embodiment 3.

Continuous operation is 4 months under this condition, though result's treating water is good, the mud transformation efficiency of being calculated by the sludge quantity of discharging from second biological treating tank 2 is 0.20kg-MLSS/kg-BOD.The shared ratio of animalcule is about 25% (w/w) among the VSS of second biological treating tank 2.

Figure 13 representes the excess sludge generation (mud transformation efficiency) with respect to the BOD that drops in embodiment 3,6,7 and the comparative example 3,4.The operational situation that the experiment of embodiment 6,7 and comparative example 3,4 began after 4 months is seen table 2.

Table 2

^*1: be the value behind the oxyphobe digestive shelf treating water of interflow in the bracket

^*2: be the value in the aerobism digestive shelf in the bracket

Can draw as drawing a conclusion by above result.

Comparative example 3 has been implemented activated sludge process in the past, and comparative example 4 has implemented to utilize the processing of two stage biological facture in the past.Mud transformation efficiency in the activated sludge process in the past (comparative example 1) is 0.40kg-MLSS/kg-BOD, and as shown in the comparative example 2, handles through importing multi-stage biological, and the mud transformation efficiency becomes 0.20kg-MLSS/kg-BOD, can reduce mud generation 1/2.It is identical with the degree of the two stage biological facture of reporting so far that this mud reduces effect.

On the other hand, in importing oxyphobe digestion operation, particularly mud minimizing obvious results embodiment 7, the mud transformation efficiency is 0.07kg-MLSS/kg-BOD, compares with previous methods as the present invention, and the mud generation can be reduced to 1/6.The reason that mud significantly reduces among the embodiment 7 is; Through pH being set in the predation of the animalcule in 5 the aerobism digestive shelf; The shared ratio of animalcule is 32% (w/w) in second biological treating tank 2 in mud VSS, and maximum can reach 60% in this aerobism digestive shelf.Dissolving easily of the mud of high animalcule ratio; Dissolved rate in the oxyphobe digestive shelf 24 of

embodiment

3,4,5 can reach 65%; With can dissolve the rate maximum and can only reach 40% (be fed into the animalcule ratio of the mud VSS of oxyphobe digestive shelf 24: embodiment 3,4 30 (w/w)) compares, and has the less effect of high mud.Through the digested sludge of further solid-liquid separation oxyphobe, in first biological treating tank 1, solvability COD composition is converted into once more and disperses bacterium, in embodiment 7,1/6 the mud that can reach previous methods reduces effect.

[the 5th aspect]

Utilize the bioremediation and the device of the organic drainage of the 5th aspect; In the multistage activated sludge process of the predation that has utilized tiny organism; When having kept stable treated water, can realize the further raising of processing efficiency and the minimizing of excess sludge generation.Organic drainage is imported into the 1st biological treating tank, and the very much not part (for example more than 70%) of organic composition is decomposed or be converted into the thalline of bacterium by bacterial oxidation.The treatment solution of the 1st biological treating tank is imported into the 2nd biological treating tank, carries out the oxygenolysis of remaining organic composition, oneself's decomposition of bacterium and the predation of animalcule, and sludge quantity reduces.

The treatment solution of the 2nd biological treating tank is handled through solid-liquid separation and is separated into treating water and mud.Treating water is taken out to outside the system.The part of mud is back to the 2nd biological treating tank.

In aspect the 5th, this is imported the 3rd processing treatment trough through the remainder of the mud of solid-liquid separation or the part of the mud in above-mentioned the 2nd biological treating tank, carry out aerobic treatment.Then, dehydration partly or entirely should be separated into solid shape and divide and moisture through the mud of aerobic treatment.Should solid shape divide, moisture is back to the 1st biological treating tank and/or the 2nd biological treating tank as the excess sludge discharge.

Through the predation of the animalcule in the 3rd biological treating tank, mud reduces.Through the pH with the 3rd biological treating tank be controlled at below 6, particularly 5～5.5, mud can fully reduce.

In aspect the 5th, the SRT that preferably makes the 2nd biological treating tank and the 3rd biological treating tank is below 40, for example 10～40 days, and particularly 15～30 days.Thus, tiny organism in the groove or meta-bolites can be kept active high animalcule by moderate reduction in groove.

Followingly the preferred implementation of the 5th aspect is carried out detailed explanation with reference to accompanying drawing.

Figure 14,15 is respectively the schema of expression the 5th aspect optimal way.

In the method for Figure 14, former water (organic drainage) at first is imported into the 1st biological treating tank (bacterium groove) 1, more than 70% of BOD (organic composition), hopes to be 80% or more, more to hope to be by the bacterial oxidation decomposition or be converted into the thalline of bacterium more than 90%.The pH that controls the 1st biological treating tank 1 hopes in pH6～8 more than 6.Through making the BOD volumetric loading in the 1st biological treating tank 1 is 1kg/m ³More than/the d, 1～20kg/m for example ³/ d makes HRT (former hydropexis time) for below the 24h, and for example 0.5～24h can obtain the dominant treating water of non-compendency bacterium, but and handles the low draining of BOD concentration through shortening HRT high loading ground.

The treating water of the 1st biological treating tank 1 is imported into the 2nd biological treating tank (tiny organism groove) 2,, carries out the oxygenolysis of residual organic composition, oneself's decomposition of bacterium and the predation of carrying out through tiny organism and reduce mud at this.

The shared ratio height of animalcule in the mud accounts for more than 5% of SS at least in the 2nd biological treating tank 2, can account for more than 30% according to the operating condition animalcule.

Decompose owing in the 2nd biological treating tank 2, utilize, therefore must adopt animalcule and bacterium to be trapped in intrasystem operating condition and treatment unit than effect of the slow-footed animalcule of bacterial multiplication and the oneself of bacterium.For this reason, hope to use the activated sludge process or the membrane sepn formula activated sludge process of in the 2nd biological treating tank 2, carrying out the mud backflow.Hope more that for maintenance dose in the groove that improves animalcule making the 2nd biological treating tank is the aerator tank that is added with carrier.

In the 2nd biological treating tank 2, be below 6 through making pH, for example pH is 5～6, preferred 5～5.5 acidity can be carried out the predation of animalcule to bacterium efficiently.

When be imported into the 2nd biological treating tank 2 from the treatment solution of the 1st biological treating tank 1 in a large amount of residual when organism is arranged, its oxygenolysis is carried out in the 2nd biological treating tank 2.If in a large amount of the 2nd biological treating tanks 2 that exist of tiny organism, bacterial organic oxygenolysis takes place,, knownly breed with the mode that is difficult to prey then as the countermeasure of escaping the predation of tiny organism.The bacterial flora of breeding with the mode that is difficult to prey so can not preyed on by tiny organism, and their decomposition only depends on self-digestion, the 2nd biological treating tank 2 with after in the 3rd biological treating tank 34 stated mud become and be difficult to reduce.The 2nd biological treating tank 2 is set in pH when being the acidic region below 6, if organism is residual in a large number, mushroom etc. utilize this organism propagation, cause sludge bulking.As stated, in the 1st treatment trough 1, the most of organism of preferred decomposition in advance, more than 70% of promptly former water BOD is hoped more than 80%, to be converted into thalline.Solvability BOD sludge loading in preferred the 2nd biological treating tank 2 is below the 0.1kg-BOD/kg-MLSS/d.

The treatment solution of the 2nd biological treating tank 2 in settling bath 3 through solid-liquid separation, divide dried up be exhausted from system as treating water outside.The part of separated sludge is back to the 2nd biological treating tank 2 and second biological treating tank 2, and remainder is sent to the 3rd biological treating tank 34, reduces through aerobic treatment.

As long as can keep the detention time of mud in the 3rd following biological treating tank 34 from the 2nd biological treating tank 2 of the separated sludge of settling bath 3 and the return sludge ratio rate of the 3rd biological treating tank 34, can change arbitrarily according to the mud generation.

During this drain treatment apparatus running beginning or the mud generation in the 1st, the 2nd biological treating tank when high, also can be with supplies more than half the 3rd biological treating tank 34 of isolating mud in the settling bath 3.The detention time of mud of the 3rd biological treating tank 34 (SRT) is preferred more than 12 hours, and special hope is more than 24 hours, for example 24～960 hours.

The same with the 2nd biological treating tank, the mud in the 3rd biological treating tank 34 reduces the predation that effect relies on animalcule.For this reason, maintaining below 6, hope through the pH with the 3rd biological treating tank 34 is 5～5.5 scope, can obtain higher mud and reduce effect.But the pH that makes the 3rd biological treating tank 34 is during for this condition, because that mud reduces effect is high, so the sludge concentration in the 3rd biological treating tank 34 is excessively low, it is difficult that the sludge dewatering that the water extracter 35 below utilizing is carried out becomes.At this moment, also can carry out aerobic treatment trough, the fluidized-bed that is added with carrier or membrane sepn formula aerobic treatment trough that mud refluxes and improve sludge concentration through settling tank will be set as the 3rd biological treating tank 34.

The detention time of mud of the 3rd biological treating tank 34 (SRT) is more than 12 hours; Hope is more than 24 hours; For example 24～960 hours, can carry out the next detention time of mud that further improves of aerobic treatment method, the fluidized-bed that is added with carrier or membrane sepn formula aerobic treatment method that mud refluxes through equipment for separating liquid from solid will be set.

The mud that reduces in the 3rd biological treating tank 34 is imported into water extracter 35, is handled by solid-liquid separation.What should explain is, also can be not the part from the mud of the 3rd biological treating tank 34 not be imported water extracter 35, and imports the 2nd biological treating tank 2.Mud (Gu shape branch) through water extracter 35 dehydrations is discharged to outside the system as excess sludge.Dehydration filtrating (moisture) is supplied to the 1st biological treating tank 1 and/or the 2nd biological treating tank 2.

Thus, the bioremediation of the organic drainage through this Figure 14 can be handled organic drainage efficiently, can reduce the excess sludge generation simultaneously.

In the present invention, shown in figure 15, make the 2nd biological treating tank 2 for multistage.Specifically; Series connection is provided with biological treating tank 2A, the 2B of 2 grooves, in previous stage treatment trough 2A, is 5～6 at pH, hopes that pH handles under 5～5.5 the condition; Also can be in the one-level treatment trough 2B of back, at pH be 6 or more, preferably pH handles under 6～8 the condition.Through this multiple-stage treatment, can in previous stage treatment trough 2A, carry out the predation of mud effectively, in the one-level treatment trough 2B of back, can realize the raising of the solid-liquid separation property of mud, the raising of treating water water quality.The method of Figure 15 only with among Figure 14 makes the 2nd biological treating tank 2 multipolarity this point different, and other formation is identical with Figure 14, and prosign is represented with a part.

What should explain is; In order to reduce the mud generation in the 2nd biological treating tank 2; Also can equally be provided with at interval, and will be set in below 6, at this moment need before discharging treating water, neutralize like the pH with the 2nd biological treating tank 2 of the single groove mode as Figure 14 unlike Figure 15.

Figure 14,15 method representation an example of the 5th aspect, as long as the 5th aspect does not exceed its main idea, be not limited to any illustrated method.

Also can be with the mud of from the 2nd biological treating tank 2, discharging, rather than the separated sludge of settling bath 3 part of the separated sludge of settling bath 3 (or with) imports the 3rd biological treating tank 34.

Through every day in the 2nd biological treating tank and the 3rd biological treating tank drain tank mud 1/40, hope to be the mud 1/30 or more, can further stablize the mud minimizing.This has determined SRT is controlled to be 40 days, hopes 30 with the running of getting off.As the effect that under this condition, turns round, tiny organism in the groove or meta-bolites can be kept active high animalcule by moderate reduction in groove.

Handle in order in the 1st biological treating tank 1, to carry out high loading; Can the part of separated sludge of the settling bath 3 of back one-level be back to the 1st biological treating tank 1, the 1 biological treating tank 1 also can connect and the above biological treating tank of 2 grooves is set carries out multiple-stage treatment.

Can add carrier in the 1st biological treating tank 1, also can be the fluidized-bed that is added with carrier.Can carry out BOD volumetric loading 5kg/m thus ³The above high loading of/d is handled.

Decompose owing in the 2nd biological treating tank 2, utilize than effect of the slow-footed animalcule of bacterial multiplication and the oneself of bacterium; Therefore adopt animalcule and bacterium to be trapped in intrasystem operating condition and treatment unit is important; For this reason; The 2nd biological treating tank 2 preferably carries out the active sludge treatment of returned sluge or carries out membrane sepn formula active sludge treatment like Figure 14, shown in 15.At this moment, through in aerator tank, adding maintenance dose in the groove that carrier can improve animalcule.

The shape of the carrier that adds in the 1st biological treating tank the 1, the 2nd biological treating tank 2 is spherical, particulate state, hollow tube-shape, random shape such as thread, and size also can be the diameter about 0.1～10mm.The material of carrier is any material such as natural material, inorganic raw material, polymer starting material, also can use spawn.

The embodiment of the 5th aspect and comparative example

Enumerate embodiment and comparative example below the 5th aspect more specifically is described.

Embodiment 8

Shown in figure 14; The capacity of use is the 1st biological treating tank (activated sludge tank (not returned sluge)) 1 of 3.6L, capacity the 2nd biological treating tank (activated sludge tank) 2 and settling bath 3 as 15L; With capacity is the experimental installation that the 3rd biological treating tank 34 of 4L is connected, and carries out the processing of organic drainage of the present invention (BOD630mg/L) with the ratio of 22L/d.The pH of each biological treating tank 1,2,4 all is adjusted to 6.8.Under following condition, turn round: the solvability BOD volumetric loading in the 1st biological treating tank 1 is 3.85kg-BOD/m ³/ d, HRT are 4h, and the solvability BOD sludge loading in the 2nd biological treating tank 2 is that 0.022kg-BOD/kg-MLSS/d, HRT are 17h, and whole BOD volumetric loading is 0.75kg-BOD/m ³/ d, HRT are 21h.

SS in the 2nd biological treating tank 2 is 4000mg/L, and settled mud is concentrated into 10000mg/L in the settling bath 3.Discharge thickened sludge from this settling bath 3, in the 3rd biological treating tank 34, import the 250ml/d that discharges in the mud, remaining mud is back to the 2nd biological treating tank 2.The HRT and the SRT of the 3rd biological treating tank 34 are set at 16 days.The processing mud of the 3rd biological treating tank 34 is through water extracter 35 processed, and dewatered sludge is discharged as excess sludge, and dehydration filtrating is back to the 2nd biological treating tank 2.

After the continuous operation 4 months, the mud transformation efficiency is 0.14kg-MLSS/kg-BOD under this condition.From the BOD of settling bath 3 effusive supernatant waters below detectability.

Embodiment 9

Use the experimental installation same, likewise carry out the processing of organic drainage (BOD630mg/L) with embodiment 8 with embodiment 8.What should explain is, is 6.8 with the pH regulator of biological treating tank 1,2, is 5.0 with the pH regulator of the 3rd biological treating tank.SS in the 2nd biological treating tank 2 is 5000mg/L.Other conditions are identical with embodiment 8.

The same with embodiment 8, the mud of from settling bath 3, discharging is concentrated into 10000mg/L.

Under this condition after the continuous operation 4 months, the mud transformation efficiency that the sludge quantity of being discharged by the 2nd biological treating tank 2 is calculated is 0.08kg-MLSS/kg-BOD.

Comparative example 5

Shown in figure 11, use has the biological treating tank (activated sludge tank) 2 ' of capacity 15L and the experimental installation of settling bath 3, carries out the processing of organic drainage (BOD630mg/L) with the ratio of 18L/d.The excess sludge output is 250mL/d, and operating condition is: the solvability BOD volumetric loading of biological treating tank 2 ' is 0.76kg-BOD/m ³/ d, HRT are 20h, pH6.8, and continuous operation is 4 months under this condition, though result's treating water is good, the mud transformation efficiency is 0.40kg-MLSS/kg-BOD.

Comparative example 6

Shown in figure 12, except omitting the 3rd biological treating tank 4, use the experimental installation same with embodiment 1, likewise carry out the processing of organic drainage (BOD630mg/L) with ratio and the embodiment 1 of 22L/d.The excess sludge output is 250mL/d, the pH condition of each groove, and loading condictions etc. are identical with embodiment 1.

Under this condition after the continuous operation 4 months, though result's treating water is good, the mud transformation efficiency that the sludge quantity of being discharged by the 2nd biological treating tank 2 is calculated is 0.20kg-MLSS/kg-BOD.The shared ratio of animalcule is about 25% (w/w) among the VSS of the 2nd biological treating tank 2.

Figure 16 representes the excess sludge generation (mud transformation efficiency) with respect to the BOD that drops in embodiment 8,9 and the comparative example 5,6.The operational situation that the experiment of embodiment 8,9 and comparative example 5,6 began after 4 months is seen table 3.

Table 3

Can draw as drawing a conclusion by above result.

Comparative example 5 has been implemented activated sludge process in the past, and comparative example 6 has implemented to utilize the processing of two stage biological facture in the past.Mud transformation efficiency in the activated sludge process in the past (comparative example 5) is 0.40kg-MLSS/kg-BOD, and as shown in the comparative example 6, handles through importing multi-stage biological, and the mud transformation efficiency becomes 0.20kg-MLSS/kg-BOD, can reduce mud generation 1/2.It is identical with the degree of the two stage biological facture of reporting so far that this mud reduces effect.

On the other hand, in the embodiment that is provided with the 3rd biological treating tank 34 8,9, the mud transformation efficiency is respectively 0.14 and 0.08kg-MLSS/kg-BOD, compares with previous methods, and the mud generation can significantly reduce.The pH that particularly makes the 3rd biological treating tank 34 among 5.0 the embodiment 2, can be reduced to 1/5 of previous methods with mud.

[the 6th and the 7th aspect]

Utilize the bioremediation and the device of the organic drainage of the 6th, 7 aspects; In the multistage activated sludge process of the predation that has utilized tiny organism; When having kept stable treated water, also can realize the further raising of processing efficiency and the minimizing of excess sludge generation.

Organic drainage is imported into the 1st biological treating tank, and the very much not part (for example more than 70%) of organic composition is decomposed by non-compendency bacterial oxidation.The treatment solution of the 1st biological treating tank is imported into the 2nd biological treating tank, carries out oneself's decomposition of the oxygenolysis of remaining organic composition, non-compendency bacterium and the predation of animalcule, and sludge quantity reduces.

In aspect the 6th, the detention time of mud (SRT) of the 2nd biological treating tank is controlled to be 5～40 days.That is,, discharge 1/5～1/40 of the interior mud of the 2nd biological treating tank every day for the SRT that makes the 2nd biological treating tank is 5～40 days.Specified amount through the mud in discharge the 2nd biological treating tank like this; Reduce the animalcule, the excrement that exist in the 2nd biological treating tank; The animalcule of a certain amount of state of laying eggs can be in the 2nd biological treating tank, often kept with higher ratio, good mud minimizing effect can be obtained.

Like this, compare with common active sludge, the mud of the 2nd biological treating tank that the ratio of animalcule is higher all can easily carry out and can dissolve in physics, chemistry, biological any processing, through dissolving, can further realize the minimizing of mud.

Under aerobic conditions in the 3rd biological treating tank aspect the 7th of the mud of oxide treatment the 2nd biological treating tank the in; Through being to discharge the mud of each groove in 5～40 days for the SRT that makes the 2nd biological treating tank and the 3rd biological treating tank; In two grooves, can keep animalcule in a large number, realize that mud reduces efficiently.

Followingly the preferred implementation of the bioremediation of the organic drainage of the 6th, 7 aspects is carried out detailed explanation with reference to accompanying drawing.

Figure 17 is the schema of the embodiment of the bioremediation of the organic drainage that the present invention relates to of expression.

In the method for Figure 17, former water (organic drainage) at first is imported into the 1st biological treating tank (disperseing the bacterium groove) 1D, and more than 70% of BOD (organic composition), hope are more than 80%, more hope to be to be decomposed by non-compendency bacterial oxidation more than 90%.The pH that controls the 1st biological treating tank 1D hopes in pH6～8 more than 6.Through making the BOD volumetric loading among the 1st biological treating tank 1D is 1kg/m ³More than/the d, 1～20kg/m for example ³/ d makes HRT (former hydropexis time) for below the 24h, and for example 0.5～24h can obtain the dominant treating water of non-compendency bacterium, but handles the low draining of BOD concentration through shortening HRT high loading ground.

The treating water of the 1st biological treating tank 1D is imported the 2nd biological treating tank (tiny organism groove) 2D,, carry out oneself's decomposition of the oxygenolysis of residual organic composition, non-compendency bacterium and the predation of carrying out through tiny organism and reduce mud at this.

Decompose owing in the 2nd biological treating tank 2D, utilize, therefore must adopt tiny organism and bacterium to be trapped in intrasystem operating condition and treatment unit than effect of the slow-footed animalcule of bacterial multiplication and the oneself of bacterium.For this reason, hope in the 2nd biological treating tank 2D, to use activated sludge process or the active processing of membrane sepn formula of carrying out the mud backflow.More hope for maintenance dose in the groove that improves animalcule, with the 2nd biological treating tank 2D as the aerator tank that is added with carrier.

In the 2nd biological treating tank 2D, be below 6 through making pH, pH5～6 for example, preferred 5～5.5 acidity can utilize animalcule to carry out the predation of bacterium efficiently.

Thus; Can the mud generation be reduced to common 50%, but when the mud output of minimizing the 2nd biological treating tank, when promptly prolonging SRT, as previously mentioned; Even the animalcule of q.s is arranged in groove; It is not laid eggs yet, or the major part of mud excrement piece and the bacterium that becomes bait also reduces only, have in the time slot animalcule to the life-span dead together.Like this, if the animalcule in the 2nd biological treating tank 2D significantly reduces, then reaching needs more than one month.For fear of this problem, need change the mud of the 2nd biological treating tank 2D termly, that is, reduce animalcule and excrement.For this reason, aspect the 6th in, for the SRT that makes the 2nd biological treating tank 2D 5～40 days, hope 10～30 days, more hope to reach certain in the scope in 20～30 the scope, discharge the mud in the 2nd biological treating tank 2D.That is, every day with 1/40～1/5, preferred 1/30～1/10, more preferably 1/20～1/30 ratio discharges the mud in the 2nd biological treating tank 2D.Through running the 2nd biological treating tank 2D under this condition, can the scale dimension that animalcule among the SS in the groove is shared be held in more than 10%, preferred 15～30%, thus, can keep stable by often that the mud generation is few state.

Active sludge when handling with common single-channel type or the active sludge when in multistage activated sludge process, only improving the sludge concentration of the 2nd biological treating tank are compared; Because the mud of discharging from the 2nd biological treating tank 2D is the high mud of ratio of animalcule; Promptly use physics, chemistry, biological any processing all can easily can dissolve, therefore preferably carry out and to dissolve with these processing.Can dissolve treatment process as this; Ultrasonication, ozonize, cavitation erosion, acid-alkali treatment, oxidizer treatment, pyroprocessing, oxyphobe digestion etc. are arranged, but can both easily the discharge mud of the 2nd biological treating tank 2D can be dissolved with few energy, few treatment time with any method.Can be back to the 2nd biological treating tank 2D at this liquefiable mud, and also can will divide dried up the 1st biological treating tank 1D and/or the 2nd biological treating tank 2D of being back to, be back to the 2nd biological treating tank 2D Gu shape is divided through solid-liquid separation.Gu the part that shape is divided or all also can be used as excess sludge and discharge.When solvable makeup is changed to the such biological method of oxyphobe digestion, after solid-liquid separation, mud is back to this oxyphobe digested sludge groove, prolongs SRT, can further promote and to dissolve and inorganicization.

What should explain is, in the present invention, a large amount of when residual from organism in the treatment solution of the 1st biological treating tank 1D that imports the 2nd biological treating tank 2D, this oxygenolysis is carried out in the 2nd biological treating tank 2D.If in a large amount of the 2nd biological treating tank 2D that exist of tiny organism, bacterial organic oxygenolysis takes place, then as the countermeasure of escaping the predation of tiny organism, known bacterium breeds with the mode that is difficult to prey.The bacterial flora of breeding with the mode that is difficult to prey so can not preyed on by tiny organism, and the decomposition of these bacteriums only depends on self-digestion, and mud becomes and is difficult to reduce.The 2nd biological treating tank 2D is set in pH when being the acidic region below 6, if organism is residual in a large number, mushroom etc. utilize this organism propagation, cause sludge bulking.Therefore, as stated, in the 1st biological treating tank 1D, the most of organism of preferred decomposition in advance, more than 70% of promptly former water BOD is hoped more than 80%, to be converted into thalline.Solvability BOD sludge loading among preferred the 2nd biological treating tank 2D is below the 0.1kg-BOD/kg-MLSS/d.

The treating water of the 2nd biological treating tank 2D in settling bath 3D through solid-liquid separation, divide dried up be exhausted from system as treating water outside.The part of separated sludge is discharged to outside the system as excess sludge, and remainder is back to the 2nd biological treating tank 2D.

In the present invention; The aerobism digestive shelf of oxide treatment separated sludge (separated sludge of the settling bath 3D among Figure 17) also can be set once more under aerobic conditions as the 3rd biological treating tank (not shown among Figure 17), the mud that this separated sludge solid-liquid separation is discharged from the 2nd biological treating tank 2D or the mud of the 2nd biological treating tank obtain.In this case, also based on the 2nd biological treating tank in identical reason, hope not only for the 2nd biological treating tank but also for the 3rd biological treating tank, 5～40 days, hope 10～30 days, more hope in 10～20 days the scope SRT to be controlled to be necessarily.For the 3rd biological treating tank, also can when satisfying this SRT,, settling bath carry out aerobic treatment method, the fluidized bed processing that is added with carrier or the membrane sepn formula aerobic treatment method prolongation SRT that mud refluxes through being set.Can be with from the part of the processing mud of the 3rd biological treating tank or all be back to the 2nd biological treating tank, and also can its solid-liquid separation be back to the 1st biological treating tank and/or the 2nd biological treating tank with treating water, and solid shape branch is back to the 2nd biological treating tank.Gu the part that shape is divided or all also can be used as excess sludge and discharge.

As long as the mud amount of giving of the 3rd biological treating tank can be kept the SRT in the 3rd above-mentioned biological treating tank, can change arbitrarily according to the mud generation.

The same with the 2nd biological treating tank, the mud in the 3rd biological treating tank reduces the predation that effect relies on animalcule.For this reason, maintaining below 6, hope through the pH with the 3rd biological treating tank is 5～5.5 scope, can obtain higher mud and reduce effect.But the pH that makes the 3rd biological treating tank is during for this condition, because that mud reduces effect is high, so the interior sludge concentration of the 3rd biological treating tank 34 is excessively low sometimes.At this moment, particularly as stated, preferably carry out aerobic treatment trough, the fluidized-bed that is added with carrier or membrane sepn formula aerobic treatment trough that mud refluxes and improve sludge concentration through settling tank will be set.

The bioremediation of the organic drainage through this 6th, 7 aspects can be handled organic drainage efficiently, can reduce the excess sludge generation steadily in the long term simultaneously.

What should explain is, the method representation of Figure 17 the example of embodiment of the 6th aspect, as long as the 6th, 7 aspects do not exceed its main idea, be not limited to any illustrated method.

For example, also can make second biological treating tank 2 for multistage.Particularly, series connection is provided with the biological treating tank of 2 grooves, in the previous stage treatment trough, is 5～6 at pH, hopes that pH handles under 5～5.5 the condition, also can be in the one-level treatment trough of back, and be 6 at pH, hope that pH handles under 6～8 the condition.Through this multiple-stage treatment, can in the previous stage treatment trough, carry out the predation of mud effectively, in the one-level treatment trough of back, improve the solid-liquid separation property of mud, improve treating water water quality.

Handle in order in the 1st biological treating tank 1D, to carry out high loading, the part backflow of the separated sludge of settling bath 3D that can the back one-level, or carry out multiple-stage treatment as the 1st biological treating tank 1D biological treating tank that is provided with more than 2 grooves of also can connecting.

Can add carrier among the 1st biological treating tank 1D, also can be the fluidized-bed that is added with carrier.Also can carry out BOD volumetric loading 5kg/m thus ³The above high loading of/d is handled.

Decompose owing in the 2nd biological treating tank 2D, utilize than effect of the slow-footed animalcule of bacterial multiplication and the oneself of bacterium; Therefore adopt animalcule and bacterium to be trapped in intrasystem operating condition and treatment unit is important; For this reason; The 2nd biological treating tank is as shown in Figure 1, preferably carries out the active sludge treatment of returned sluge or carries out membrane sepn formula active sludge treatment.At this moment, through in aerator tank, adding maintenance dose in the groove that carrier can improve animalcule.

The shape of the carrier that adds in the 1st biological treating tank, the 2nd biological treating tank is spherical, particulate state, hollow tube-shape, random shape such as thread, and size also can be the diameter about 0.1～10mm.The material of carrier is any material such as natural material, inorganic raw material, polymer starting material, also can use spawn.

6th, the embodiment of the 7th aspect and comparative example

Enumerate embodiment and comparative example below the 6th, 7 aspects more specifically are described.

Embodiment 10

Shown in figure 17; The capacity of use as the experimental installation that the 2nd biological treating tank (activated sludge tank) 2D of 15L is connected with settling bath 3D, carries out the processing of organic drainage of the present invention (BOD630mg/L) as the 1st biological treating tank (activated sludge tank (not the returned sluge)) 1D of 3.6L, capacity with the ratio of 22L/d.The pH of each biological treating

tank

1D, 2D all is adjusted to 6.8.Under following condition, turn round: the solvability BOD volumetric loading among the 1st biological treating tank 1D is 3.85kg-BOD/m ³/ d, HRT are 4h, and the solvability BOD sludge loading among the 2nd biological treating tank 2D is that 0.022kg-BOD/kg-MLSS/d, HRT are 17h, and whole BOD volumetric loading is 0.75kg-BOD/m ³/ d, HRT are 21h.In the 2nd biological treating tank 2D drain tank every day 1/25 of mud,, the mud of discharging is expelled to outside the system so that SRT is 25 days.

Figure 18 represent this moment the 2nd biological treating tank in 2D the animalcule number through daily variation, Figure 19 represent the mud transformation efficiency through daily variation.

SS in the 2nd biological treating tank 2D is 3500mg/L; The dominant species of animalcule in the groove is the sufficient wheel animalcule of palpus, leech wheel animalcule; Be respectively about 30000/ml, about 35000/ml, the shared ratio of animalcule is about 50% among the interior SS of groove, and this state can stably be kept more than 5 months.The mud transformation efficiency is 0.15kg-MLSS/kg-BOD, and the mud transformation efficiency when the single groove of the utilization of then stating is handled the comparative example 7 that carries out is 0.37kg-MLSS/kg-BOD, compares with the latter stably to maintain 60% mud minimizing effect.What should explain is, the BOD of the treating water that is obtained by settling bath 3D is below the detectability.

If be the discharge mud that oxyphobe digests the 2nd biological treating tank 2D under 15 days the condition at SRT, can 50% of COD be converted into methane.If consider this effect, we can say and compare the mud that can reduce more than 75% with previous methods.

Comparative example 7

Shown in figure 11, use to comprise that capacity as biological treating tank (activated sludge tank) 2 ' of 15L and the experimental installation of settling bath 3, carries out the processing of organic drainage (BOD630mg/L) with the ratio of 18L/d.Continuous operation under following condition: sludge back flow quantity is 250mL/d, and the excess sludge output is 250mL/d, and the solvability BOD volumetric loading of biological treating tank 2 ' is 0.76kg-BOD/m ³/ d, HRT are 20h, and pH is 6.8, though treating water water quality is good, the mud transformation efficiency is 0.37kg-MLSS/kg-BOD.

Comparative example 8

Except make mud output from the 2nd biological treating tank 2D be every day in the groove mud 1/45 so that SRT is 45 days, under the condition identical, turn round with embodiment 10.

In this comparative example 8, lack than embodiment 10 from the mud output of the 2nd biological treating tank 2D, therefore the SS in the 2nd biological treating tank 2D is high, is 5000mg/L, but is the sludge concentration of active sludge treatment.The dominant species of animalcule in the 2nd biological treating tank 2D is the leech wheel animalcule; Its amount constantly changes, and is 0～50000/ml, and the shared ratio of animalcule is about 0～25% among the interior SS of groove; The mass mortality of animalcule approximately whenever took place at a distance from 40 days under this condition, and each mud transformation efficiency increases.For this reason, though treating water water quality is good, average mud transformation efficiency is 0.20kg-MLSS/kg-BOD, compares mud minimizing effect with comparative example 7 and rests on about 45%.

Even at SRT be the discharge mud that oxyphobe digests the 2nd biological treating tank 2D under 15 days the condition; Containing of animalcule is proportional low, therefore, only has 30% COD can be converted into methane; Even consider this effect, compare mud minimizing effect with previous methods and also rest on about 60%.

By above result, can draw as drawing a conclusion.Promptly; Through importing two stage biological facture, but decreased average mud generation about 45%, but shown in comparative example 8; If too prolong SRT in order to increase sludge concentration in the 2nd biological treating tank; Then can't make the animalcule number in the 2nd biological treating tank stable, the mud transformation efficiency is constantly change still, and the result can't obtain sufficient mud and reduce effect.

But; As embodiment 10, through regularly discharging mud in the 2nd biological treating tank according to the life cycle of wanting to maintain the animalcule in the 2nd biological treating tank 2D, the mud decrement is increased to 60%; This excess sludge contains this metazoan of wheel animalcule in a large number; Therefore compare with common mud, utilize the minimizing of oxyphobe digestion also easy, so can further reduce mud.

Embodiment 11

With a part of 600mL/d capacity of being back in the separated sludge of settling bath 3D is the 3rd biological treating tank of 6L; Remainder is back to the 2nd biological treating tank 2D; Solid-liquid separation is through the mud of aerobism digestion in the 3rd biological treating tank; To divide dried up the 1st biological treating tank 1D that is back to, separated sludge will be back to the 2nd biological treating tank 2D, in addition likewise handle with embodiment 10.

The pH that makes the 3rd biological treating tank is 5.0, and 1/10 of mud so that SRT is 10 days in the every day drain tank, outside the mud discharge system that discharges.As a result, the BOD of the treating water that is obtained by settling bath is below the detectability, and the mud transformation efficiency is 0.7kg-MLSS/kg-BOD.

Reference example 1

1/45 of mud so that the SRT of the 3rd biological treating tank is 45 days in the every day drain tank; In addition turn round with embodiment 11 same conditions; Result treatment water water quality is the same with embodiment 2; But the mud transformation efficiency is 0.11kg-MLSS/kg-BOD, through the mud minimizing effect reduction that the 3rd biological treating tank causes is set.

Can know with reference example 1 by embodiment 11; Through being set, the 3rd biological treating tank further carries out aerobism digestion; Can realize that further mud reduces, if but the SRT in the 3rd biological treating tank is long, and then the mud that causes of the 3rd biological treating tank reduces effect and reduces.

[the 8th and the 9th aspect]

Bioremediation according to the organic drainage of the 8th, 9 aspects; On the basis of following action effect, utilize in the multistage activated sludge process of predation of animalcule, can when keeping stable treated water, can realize the further raising of processing efficiency and the minimizing of excess sludge generation.

In the state of the bacterium that in carrying out the 1st biologic treatment process that organism removes, generates, being easy to most is the bacterium of dispersion state by the animalcule predation.Even flocculating bacterium, if in the 2nd biologic treatment process, have agglomeration predation type animalcule, then can fully prey on except filtering predation type animalcule.But for bacterium is preyed on rapidly by animalcule, single bacterium is favourable less than the bore of animalcule; No matter bacterium is dispersion state, or flocculation state, during threadization of bacterium, though can be preyed on by animalcule; But predation speed is low, and mud reduces effect and also reduces.

In order to overcome the above problems, in the 8th, 9 aspects, turn round under the condition of threadization of bacterium that in not making the 1st biologic treatment process, generates.

That is, control the HRT of the 1st biologic treatment process so that as the organic composition in the organic drainage of standard (BOD) more than or equal to 70% less than 100% reach the required standard HRT of oxidized decomposition 0.75～1.5 times scope.

At this, make the BOD oxygenolysis rate less than 100% of standard HRT and the BOD incomplete oxidation is decomposed, be in order to prevent that in system non-compendency bacterium under the non-existent condition of BOD has the tendency of threadization, flocculating.The BOD oxygenolysis rate that makes standard HRT is 70% to be to get into the 2nd biologic treatment process in order to prevent to surpass 30% BOD.When the BOD above 30% gets into the 2nd biologic treatment process, can't enjoy sufficient mud and reduce effect.This is because in the 2nd biologic treatment process, and non-compendency threadization of bacterium also decomposed and surpassed this BOD of 30%, and animalcule becomes and is difficult to prey on the result and can't obtains sufficient mud and reduce effect for this reason.

Though the organic drainage amount is through time change; But because HRT is that treatment trough volume (L) obtains divided by treating water flow (L/h); HRT was elongated when therefore the organic drainage amount reduced; Flocculating or threadization of non-compendency bacterium take place, and the predation speed in the 2nd biologic treatment process is low, and it is also low that mud reduces effect.

Therefore, aspect the 8th in organic drainage amount when reducing, through in the organic drainage that is supplied in the 1st biologic treatment process, adding liquid, make flow in the 1st biologic treatment process to be processed the water yield certain, make the HRT in the 1st biologic treatment process stable.As this liquid, the same with claim 2, the preferred treating water that uses through the 2nd biologic treatment process.

In aspect the 9th, the water yield in the treatment trough that carries out the 1st biologic treatment process is changed, make the HRT stabilization of the 1st biologic treatment process through change according to the organic drainage amount.

Thus; According to the 8th, 9 aspects, be in 0.75～1.5 times the scope of standard HRT through the HRT that controls the 1st biologic treatment process to satisfy as the BOD oxygenolysis rate of the organic drainage of standard more than or equal to 30% less than 100% the non-compendency bacterium that does not generate in threadization, flocculating the 1st biologic treatment process; Be about to it and can be back to the 2nd biologic treatment process; In the 2nd biologic treatment process, but high density ground stabilization animalcule concentration obtains good mud and reduces effect.

What should explain is that the HRT of the 1st biologic treatment process preferably is controlled to be standard HRT, but general in 0.75～1.5 times of scope of standard HRT, can fully obtain effect of the present invention.But, preferably with the HRT of the 1st biologic treatment process be controlled at 0.9～1.2 times of standard HRT, particularly in 0.95～1.05 times the scope.

When big change takes place in the BOD concentration of organic drainage, even the HRT of the 1st biologic treatment process is controlled in 0.75～1.5 times the scope with respect to the standard HRT that formulates as the organic drainage of standard the problem below taking place sometimes.Promptly; The BOD concentration of organic drainage is reduced to below 50% of BOD concentration as the organic drainage of standard; When recovering the BOD concentration as standard afterwards once more; In the 1st biologic treatment process, traceable BOD is to the change of bacterium, in the 1st biologic treatment process, can not decompose and residual BOD will flow into the 2nd biologic treatment process.Flow into BOD oxidized decomposition in the 2nd biologic treatment process of the 2nd biologic treatment process; But if the oxygenolysis of bacterial BOD takes place in a large amount of the 2nd biologic treatment process that exist of animalcule; Then escape the countermeasure of the predation of tiny organism as bacterium, knownly breed with the mode that is difficult to prey, the bacterial flora of propagation can not preyed on by tiny organism like this; Their decomposition only depends on self-digestion, can reduce the effect that the mud generation reduces.

Through with the fluidized bed type biologic treatment process of in treatment trough, having added carrier as the 1st biologic treatment process; The supply source of bacterium in the 1st biologic treatment process that reduces when low as load attached to the microbial film on the carrier; When recovering load once more; Bacterium breeds rapidly, and it is stable to make BOD in the 1st biologic treatment process remove rate, therefore can solve the problems referred to above that the BOD concentration change of organic drainage causes.

Specify the optimal way of bioremediation of the organic drainage of the 8th, 9 aspects with reference to the accompanying drawings.

Figure 20～23 are the schema of the optimal way of the bioremediation of the organic drainage of expression the 8th, the 9th aspect.In Figure 20～23,1 is the 1st biological treating tank, and 2 is the 2nd biological treating tank, and 3 is settling bath; 54 is under meter, and 55 is regulating tank, and 55A is former water storage tank, and 55B is for handling tank; 56 is raw water pump, and 57 use pump for regulation of level, and 58 use screen cloth for carrier separating, and 59 is carrier.

In the where method in office, former water (organic drainage) all is at first to be imported into the 1st biological treating tank (disperseing the bacterium groove) 1,70% or more of BOD (organic composition), hope be 80% or more, more hope is by non-compendency bacterial oxidation decomposition more than 90%.The pH that controls the 1st biological treating tank 1 hopes in pH6～8 more than 6.BOD volumetric loading in the 1st biological treating tank 1 is 1kg/m ³More than/the d, 1～20kg/m for example ³/ d; HRT (former hydropexis time) is below the 24h; The scope of 0.5～24h for example, through make HRT be with after in 0.75～1.5 times the scope of the standard HRT that formulates in advance of the method stated, can obtain the dominant treating water of non-compendency bacterium; But and through shortening the low draining of HRT high loading ground processing BOD concentration, therefore preferably.

The treating water of the 1st biological treating tank 1 is imported the 2nd biological treating tank (tiny organism groove) 2,, carry out oneself's decomposition of the oxygenolysis of residual organic composition, non-compendency bacterium and the predation of carrying out through tiny organism and reduce mud at this.The 2nd biological treating tank 2 is more than the pH6, handle under the condition of preferred pH6～8.

The treating water of the 2nd biological treating tank 2 in settling bath 3 through solid-liquid separation, divide dried up be exhausted from system as treating water outside.The part of separated sludge is discharged to outside the system as excess sludge, and remainder is back to the 2nd biological treating tank 2.What should explain is; The backflow of this mud is carried out for the sludge quantity of keeping in each biological treating tank; But the situation that does not need returned sluge is also arranged, for example make the 1st biological treating tank 1 and/or the 2nd biological treating tank 2 just not need returned sluge when stating the fluidized bed type of carrier after being added with.When the BOD volumetric loading of the 1st biological treating tank 1 hanged down, as shown in the figure, mud can only be back to the 2nd biological treating tank 2, also can be back to the 1st biological treating tank 1, can also be back to the 1st biological treating tank 1 and the 2nd biological treating tank 2 the two.Also the 3rd biological treating tank can be set, handle, further reduce mud from the mud of the 2nd biological treating tank or settling bath discharge.Can directly be back to 1st and/or 2nd biological treating tank from the mud of discharging here, also can solid-liquid separation handle as excess sludge.At this moment, also can be back to the 1st and/or the 2nd biological treating tank with taking off lyotropic part or all.In addition, can part or all that consolidate that shape divides be back to the 1st and/or the 2nd biological treating tank, also can be used as dewatered sludge and handle.Bioremediation can be any that oxyphobe is handled, aerobism is handled.

In the 8th, aspect 9, wait through test on the table and to obtain standard HRT in advance, control the HRT of the 1st biological treating tank 1 so that it reaches 0.75～1.5 times the scope of this standard HRT.

Table as obtaining standard HRT is gone up the method for test, can carry out as follows.Promptly; To supply with, discharge culture tank as the organic drainage of object continuously with same speed; The dilution of the bacterium that the propagation of bacterium and the supply of organic drainage cause reaches equilibrium state, and residual draining BOD reaches below 30% of initial BOD of draining, the feed speed of the draining of hope below 20% is obtained the best residence time (HRT) by making at this moment.Beyond above-mentioned continuous experiment, also can obtain decomposition rate in addition, obtain optimal HRT by this result by the gradation experiment as the draining of object.When containing hard-decomposed composition in the draining in a large number, optimal HRT is elongated or contains the differentiated composition of decomposition rate in a large number; Hope is carried out some processing to the object draining; Promote the decomposition of hard-decomposed composition, below HRT24h, hope below the 12h to decompose 70% or more, the organic composition in the draining of hope more than 80%.As the decomposition promotion method of hard-decomposed composition, also can use biological treatment that the chemical treatment that the medicine that utilizes acid, alkali etc. carries out, the utilization that utilizes specific bacteria or enzyme etc. carry out, in the physical treatment any.

In the 8th, aspect 9, standard HRT for as the organic drainage of standard be converted into the required HRT of thalline more than or equal to 70% less than 100% BOD, but be preferably set to more than 75% of this BOD, particularly 80～95% be converted into the required HRT of thalline.

As stated, preferably with the HRT of the 1st biological treating tank 1 be controlled at 0.9～1.2 times of standard HRT, particularly in 0.95～1.05 times the scope.

In the method for Figure 20, the former water that the treating water of settling bath 2 is back to the 1st biological treating tank 1 imports side, so that the HRT of the 1st biological treating tank 1 reaches prescribed value.

That is, measure the flow of former water, during HRT that the former water yield is guaranteed to stipulate inadequately, replenish its insufficient section with treating water with under meter 54, with the former water yield be back to the total of handling the water yield HRT and be controlled at specialized range the 1st biological treating tank 1.

Also can control the amount of liquid that flows into the 1st biological treating tank 1 with method shown in Figure 21.In Figure 21, former water storage tank 55A is set and to handle tank 55B adjacent and the regulating tank 55 established is supplied with 1st biological treating tank 1 with the water yield of specified amount with processed water from these regulating tank 55 usefulness raw water pumps 56.This regulating tank 55 is according to the water level of former water storage tank 55A; Be arranged on the next door that has liquid communication portion between two grooves; So that the treating water of handling in the tank 55B flows in the former water storage tank 55A; Absorb the increase and decrease of the former water yield with this adjustment groove 55, former water or former water and treating water are back to the 1st biological treating tank 1, can the HRT of the 1st biological treating tank 1 be maintained specialized range thus with certain water yield.In the method for this Figure 21, through regulating tank 55 is set, can omit under meter 54 and treating water reflux pump (not shown among Figure 20) among Figure 20, simplify the control of HRT.

In method shown in Figure 22; In the 1st biological treating tank 1, regulation of level is set with pump 57; The former water yield that flows into the 1st biological treating tank 1 is few, when the HRT of the 1st biological treating tank 1 has elongated tendency, with pump 57 water in the 1st biological treating tank 1 forcibly is transferred to the 2nd biological treating tank 2 with this regulation of level; The apparent water-retaining capacity of the 1st biological treating tank 1 is reduced, can the HRT of the 1st biological treating tank 1 be maintained the scope of regulation thus.

Method shown in Figure 23; Be in method shown in Figure 22; In the 1st biological treating tank 1, carrier separating is set with screen cloth 58, the former water that carrier 59 is dropped into this screen cloth 58 imports side, discharges side at the treating water of screen cloth 58 simultaneously and regulation of level is set with pump 57; Identical with method shown in Figure 22; Forcibly the water in the 1st biological treating tank 1 is transferred to the 2nd biological treating tank 2 with this regulation of level with pump 57, the apparent water-retaining capacity of the 1st biological treating tank 1 is reduced, can the HRT of the 1st biological treating tank 1 be maintained the scope of regulation thus.

In method shown in Figure 23,, as stated, the BOD rate of removing in the 1st biological treating tank 1 is stablized with respect to the change of former water BOD concentration through in the 1st biological treating tank 1, dropping into carrier 59.

The interpolation rate of carrier in the 1st biological treating tank 1 (below be called " filling ratio in the groove ") is preferably 0.1～20% with respect to the useful volume of the 1st biological treating tank 1, and more preferably 1～10%, preferred especially 2～5%.Being shaped as of the carrier that adds is spherical, particulate state, hollow tube-shape, random shape such as thread, and size also can be the diameter about 0.1～10mm.The material of carrier is any material such as natural material, inorganic raw material, polymer starting material, also can use spawn.

Self-evidently be in Figure 20,21 method, also can in the 1st biological treating tank 1, add carrier.When employing utilizes regulation of level with pump 57 water in the 1st biological treating tank 1 to be transferred to the structure of the 2nd biological treating tank 2, shown in figure 23, need carrier separating be set up to the bottom of the 1st biological treating tank 1 with screen cloth 58.At this moment, in order to prevent to clog from the microbial film that carrier strips down the outflow of screen cloth 58, obstruction SS, prevent that detention time of mud is elongated, the perforate of hoping screen cloth 58 is more than the 5mm, in this case, hopes that the diameter of the carrier 59 of interpolation is more than the 5mm.

What should explain is that the method shown in Figure 20～23 is an example of the 8th, 9 aspects, as long as the 8th, the 9th aspect does not exceed its main idea, is not limited to illustrated any way.For example, be used for controlling HRT and the liquid that is added on former water except treating water, can use process water, well water, town water, river etc., preferably use treating water.

Carrier not only can make an addition to the 1st biological treating tank 1, also can make an addition to the 2nd biological treating tank 2.The 1st biological treating tank the 1, the 2nd biological treating tank 2 can adopt the multiple-stage treatment of the above biological treating tank of arranged in series 2 grooves, also can be employed in the membrane sepn formula active sludge treatment that is impregnated with separatory membrane in the groove.

But, the activity of bacterium, be that the BOD resolving power increases along with increase in temperature, along with temperature reduces and reduces.In a word, the HRT of the 1st biological treating tank that the BOD oxygenolysis rate of acquisition regulation is required uprises along with temperature and shortens, and prolongs along with the temperature step-down.Therefore; Temperature variation about former water is higher than the former water of temperature more than 5 ℃ as benchmark; The preferred variation of confirming the optimal HRT that temperature causes in advance by test on the table; Considered the standard HRT of Influence of Temperature when preestablishing temperature variation,, the HRT of the 1st biological treating tank has been controlled in 0.75～1.5 times, more preferably 0.9～1.2 times, preferred especially 0.95～1.05 times scope with respect to this standard HRT.

Likewise; When big change takes place with respect to the BOD concentration as benchmark in the BOD concentration change of former water; Also preferably preestablish standard HRT based on this BOD concentration change; With respect to this standard HRT, the HRT of the 1st biological treating tank is controlled in 0.75～1.5 times, more preferably 0.9～1.2 times, preferred especially 0.95～1.05 times scope.

Thus; Be controlled at the bioremediation of the organic drainage of the present invention in the scope of regulation according to HRT with the 1st biological treating tank 1; Animalcule increase in density in the 2nd biological treating tank 2; In the groove among the SS the shared ratio of animalcule be maintained at more than 10%, by after the result of the embodiment that states can know, compare the mud minimizing effect that can stably obtain 50% or more with conventional actived sludge.

8th, the embodiment of the 9th aspect and comparative example

Enumerate embodiment and comparative example below the 8th, the 9th aspect more specifically is described.

Embodiment 12

Use to be connected with as the capacity of the 1st biological treating tank 1, implement the processing of organic drainage with method of the present invention shown in Figure 1 as the activated sludge tank (not returned sluge) of 3.6L with as the capacity of the 2nd biological treating tank 1 experimental installation as the activated sludge tank of 15L.The pH that regulates first biological treating tank 11 respectively is that the pH of 6.8, second biological treating tank 12 is 6.8.Under following condition, turn round, promptly the solvability BOD volumetric loading in the 1st biological treating tank 1 is 3.85kg-BOD/m ³/ d, HRT are 4h, and the solvability BOD sludge loading in the 2nd biological treating tank 2 is that 0.022kg-BOD/kg-MLSS/d, HRT are 17h, and whole BOD volumetric loading is 0.75kg-BOD/m ³/ d, HRT are 21h.Experiment is carried out under in 20 ℃ thermostatic chamber.The mud transformation efficiency is 0.18kg-MLSS/kg-BOD as a result.What should explain is, the HRT of 75% required the 1st biological treating tank 1 of the BOD in the former water that oxygenolysis is obtained through test on the table in advance is 4h.

From turning round beginning after 1 month; 12h turns round under condition same as described above; Carry out afterwards the matrix flow is reduced to half the and replenishes the running (the BOD volumetric loading being reduced by half) of the water yield that reduces part with treating water around here; Replace 12h and repeat the test (load change running) of above-mentioned running, the result can maintain the HRT of the 1st biological treating tank 1 about 4h, and the bacterium in the 1st biological treating tank 1 also is maintained at dispersion state.But, when reducing by half, disperse load bacteria concentration to reduce, and disperse the propagation again of bacterium to have little time during load restoration, the organism in the draining does not decompose, and flows into the 2nd biological treating tank 2 sometimes.For this reason, the mud transformation efficiency increases some, reaches 0.28kg-SS/kg-BOD.

The leech wheel animalcule is preponderated in the 2nd biological treating tank 2 between on-stream period; Animalcule number before the load change running is 55000～70000/ml; Shared ratio is 20% among the interior SS of groove, but after the load change running beginning, the animalcule number rests on about 30000/ml.

Embodiment 13

In the 1st biological treating tank 1 with 5% groove in filling ratio to add particle diameter be the sponge of 5mm, in the 1st biological treating tank, carry out the fluidized bed type active sludge treatment, in addition, under the condition identical, turn round with embodiment 1.

As a result, after the load change running beginning, also can the HRT of the 1st biological treating tank 1 be maintained about 4h, the bacterium in the 1st biological treating tank 1 also is maintained at dispersion state.And the mud transformation efficiency also can maintain 0.18kg-SS/kg-BOD.

In between on-stream period, in the front and back of high loading change, the leech wheel animalcule is all preponderated in the 2nd biological treating tank 2, and the animalcule number is 55000～70000/ml, and shared ratio is 20% among the interior SS of groove.

Comparative example 9

In embodiment 12, omit the 1st biological treating tank, use only to comprise the experimental installation of capacity as the 2nd biological treating tank of 15L, handle.Experiment is carried out under in 20 ℃ thermostatic chamber, is 0.76kg-BOD/m at solvability BOD volumetric loading ³/ d, HRT are continuous operation 1 month under the condition of 20h, though result's water quality treatment is good, the mud transformation efficiency is 0.40kg-SS/kg-BOD.

The same with embodiment 12, carry out the matrix flow is reduced to half the running (the BOD volumetric loading being reduced by half) 12h around here, carry out the load change service test that every 12h alternately repeats above-mentioned running, the mud transformation efficiency is constant as a result, reaches 0.40kg-SS/kg-BOD.In between on-stream period, in activated sludge tank, can be observed the sufficient wheel animalcule of palpus of the leech wheel animalcule of 3000/ml, 10000/ml, the shared ratio of animalcule often is below 5% among the interior SS of groove.

Comparative example 10

After the load change running, the matrix flow is reduced to the backflow of not carrying out treating water after half, in addition, under the condition identical, turns round with embodiment 12.

As a result, before the load change running, the same with embodiment 1; The mud transformation efficiency is 0.18kg-SS/kg-BOD; After the load change running beginning, in the 1st biological treating tank 1, the thread property bacterium of dispersion state (long 50～1000 μ m) is preponderated; Dominant leech wheel animalcule is reduced to 0/ml by 50000/ml before making load change in the 2nd biological treating tank 2, and the mud transformation efficiency also rises to 0.34kg-SS/kg-BOD.

Figure 24 representes that (produce VSS: the relation the mud transformation efficiency), Figure 25 representes that the input BOD after the load change running beginning measures and the excess sludge generation (produces VSS: relation the mud transformation efficiency) for input BOD amount in

above embodiment

12,13 and the comparative example 9,10, that the load change running is preceding and excess sludge generation.

Can know by Figure 24,25,, utilize the multistage activated sludge process of the predation of animalcule can obtain higher mud minimizing effect no matter before and after the load change; But utilizing during multistage activated sludge process handles; According to the present invention, maintain in the specialized range through HRT, and then carry out the fluidized bed type active sludge treatment through in the 1st biological treating tank, adding carrier with the 1st biological treating tank; No matter how load changes thus, all can obtain stable mud and reduce effect.

Claims

1. the bioremediation of organic drainage, this method has:

High loading handle in the organic drainage BOD so that the BOD 70% or more be converted into the dispersion thalline the 1st biological treating tank and

Make the 2nd biological treating tank of tiny organism coexistence in the dispersion thalline flocculating after will transforming,

The method is characterized in that: wherein said the 1st biological treating tank is handled under the condition of pH6～8, and said the 2nd biological treating tank is handled under the condition of pH5～6,

The BOD volumetric loading of the 1st biological treating tank is 1～20kg/m ³/ d,

The HRT of the 1st biological treating tank is 0.5～24h,

The solvability BOD sludge loading of the 2nd biological treating tank is 0.01～0.1kg-BOD/kg-MLSS/d.

2. the bioremediation of organic drainage as claimed in claim 1; It is characterized in that; Making the treatment process in said the 2nd biological treating tank is the multiple-stage treatment more than 2 grades, in the 2nd biological treating tank, after the biological treatment of pH5～6, carries out the biological treatment more than the pH6.

3. the bioremediation of organic drainage as claimed in claim 1; It is characterized in that; The processing mode of utilizing said the 2nd biological treating tank to carry out is that the back segment at biological treating tank is provided with equipment for separating liquid from solid, will be back to the sludge return type biological treatment mode of this biological treating tank through the mud of solid-liquid separation; In biological treating tank, added the fluidized bed type biological treatment mode of carrier, or membrane sepn formula biological treatment mode.

4. the bioremediation of organic drainage as claimed in claim 1; It is characterized in that; Be utilized in the fluidized bed type biological treatment mode or the multiple-stage treatment mode more than 2 grades of having added carrier in the biological treating tank, carry out the processing in said the 1st biological treating tank.