CN104445612A - Method for rapidly starting denitrification-nitrification biochemical treatment system - Google Patents
Method for rapidly starting denitrification-nitrification biochemical treatment system Download PDFInfo
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Abstract
The invention relates to a method for rapidly starting a denitrification-nitrification biochemical treatment system, the denitrification-nitrification biochemical treatment system comprises the following components: a homogenizing unit, an anoxic unit, an aerobic unit and a deposition unit; the anoxic unit and the aerobic unit are collectively referred to as a biochemistry unit. The method is characterized in that an oxidizability substance required by denitrification is added in the homogenizing unit or the anoxic unit for domestication of denitrifying bacteria in advance, an iron compound is added at the homogenizing unit or the anoxic unit or the aerobic unit or an outlet of the aerobic unit for improving the sludge settlement performance of the deposition unit, and inhibition of iron ion in the iron compound (except iron hydroxide) on the denitrification and nitrification reactions can be eliminated by adding alkalescence substance. The method guarantees rapid starting of the denitrification-nitrification biochemical treatment system, when the denitrification-nitrification biochemical treatment system is started by using same seed sludge and a water inlet program. The method provided by the invention can complete starting by at least three weeks in advance, and the effluent standard-reaching rate at a starting period is increased.
Description
Technical field
The present invention relates to the biochemical treatment of waste water or sewage, is a kind of method of quick startup denitrification-nitrated biochemical treatment system specifically, and described denitrification-nitrated biochemical treatment system is for the treatment of the waste water containing high-enriched organics and ammonia nitrogen in high density simultaneously.
Background technology
The waste water that some industrial installation is discharged, multiple production equipment discharges the composite waste of waste water or the composite waste of above waste water and municipal effluent, the waste water that all may be formed simultaneously containing higher concentration organism and behavior of high-strength ammonium (namely contains the waste water of high-enriched organics and ammonia nitrogen in high density simultaneously, waste water referred to as containing organism and ammonia nitrogen), country and provincial standard can show as high concentration COD to the COD(high-enriched organics of draining when measuring, but COD does not always represent organism), ammonia nitrogen has requirement, and index is more and more stricter, the processing requirements this type of being contained to the waste water of organism and ammonia nitrogen is substantially all to remove organism, also removal of ammonia and nitrogen is wanted.
When major part, the cost of denitrification-nitrated biochemical processing process process or relatively low is adopted to the waste water containing organism and ammonia nitrogen.Organism in the high-valence state nitrogen oxidized waste waters such as the preposition nitrate radical that nitration section can be utilized to produce of denitrification, can reduce the organic loading of aerobic unit, increases the nitrobacteria content of aerobic unit.
Conventional denitrification-nitrated biochemical treatment system mainly comprises: homogeneous unit, anoxic unit are (also referred to as double oxygen unit, mainly carry out denitrification biochemical reaction), aerobic unit is (also referred to as aeration unit, mainly carry out nitration reaction) and precipitation unit, wherein anoxic unit and aerobic unit also can be referred to as biochemical unit.Conventional denitrification-nitrated biochemical treatment system schematic flow sheet is shown in Fig. 1.In Fig. 1, homogeneous refers to homogeneous unit, anoxic refers to anoxic unit, aerobic finger aerobic unit, precipitation refer to precipitation unit.The main units of unit is as follows: homogeneous unit is generally homogeneous pond, and anoxic unit is generally oxygen compatibility pool, and aerobic unit is generally aeration tank, and precipitation unit is generally settling tank, and except the form in pond, each structures also can use the forms such as tank, post, well.
But conventional denitrification-nitrated biochemical treatment system existence startup even starts failed problem slowly.Generally believe that nitrobacteria is chemoautotrophic bacteria, generation time is long, reproduction speed slow, be easy to run off, easily cause that nitrobacteria ratio in system biological amount is too small, difficulty in starting, fluctuation of service.
200910219411.9 propose to adopt high-concentration ammonia nitrogenous wastewater to enter rear-mounted denitrification device artificial culture nitrobacteria, are added in urban sewage treatment system, nitrobacteria ratio in raising system; 200710010384.5(CN101239751) propose to adopt intermittent activated sludge process to improve nutrient solution ammonia nitrogen concentration enrichment culture nitrobacteria mud gradually and then process high concentration ammonia nitrogen sewage.These scheme essence constantly add nitrifier to denitrification-nitrated biochemical treatment system, is not to solve the essential measure that in start-up course, in system, nitrobacteria is run off, and do not impel denitrification-nitrated biochemical treatment system self to start and steady running; And the two all needs to adopt independent device for cultivating nitrifier outside wastewater treatment equipment, adds device quantity and running cost.
200910098630.6(C101549903B) propose continuum micromeehanics interval water outlet add the Starting mode of blood urea nitrogen to design loading 2 ~ 3 times, the method of fundamentally start quickly is not proposed, the startup cycle does not reduce, the ratio adding nitrobacteria is seemed in startup, but the nitrification ability of device can decline because of actual motion again very soon, and the water outlet of continuum micromeehanics interval is especially leaned on the device of flow by gravity overflow can not realize in non-batch operation scheme.
Aerobic nitrifying granular activated sludge seems to solve nitrifier losing issue.And " temperature is on the impact (China Environmental Science 2009 of aerobic particle mud nitrogen removal performance and granule stability, 29 (7): 697-70) research " and 210810228327.9(CN101386448B) shows, current aerobic nitrifying granular activated sludge technology is applicable to the higher occasion of ammonia nitrogen loading, and temperature fluctuation, working time extend all can cause granule sludge disintegrate finally cause the fluctuation of service of system and finally cause starting unsuccessfully, more crucially the cultivation of aerobic nitrifying granular activated sludge is more difficult to realization of industrialization.
201010136902.X(CN101774693B) adopt first preliminary biofilm then emphasis cultivate the mode that domestication nitrifier cultivates domestication denitrifying bacteria again, can by up to standard for the water outlet of pre-denitrification biological aerated filter process debugging through 120 days ~ 140 days.Which is not suitable for Sludge System, and required start time is still longer.
Therefore conventional denitrification-nitrated biochemical treatment system starts when water inlet is the waste water containing high-enriched organics and ammonia nitrogen in high density simultaneously, especially start within the very fast time, be still difficult point and the key point of denitrification-nitrated biochemical treatment waste water technology, need fundamentally to solve, the successful Application of this technology could be promoted.
Summary of the invention
For the defect of existing denitrification-nitrated biochemical processing process start-up technique simultaneously containing existence when starting when high-enriched organics and ammonia nitrogen in high density in biochemical unit object water inlet, the object of the present invention is to provide a kind of method of quick startup denitrification-nitrated biochemical treatment system, low with nitrobacteria ratio in the start-up course overcoming the conventional starting method of existing denitrification-nitrated biochemical treatment system, nitrobacteria is easily run off, system starts slow and instability problem.
For reaching above object, the technical scheme that the present invention takes is:
A kind of method of quick startup denitrification-nitrated biochemical treatment system, described denitrification-nitrated biochemical treatment system is for the treatment of the waste water containing high-enriched organics and ammonia nitrogen in high density simultaneously, this system comprises: homogeneous unit, anoxic unit, aerobic unit and precipitation unit, anoxic unit and aerobic unit are referred to as biochemical unit, it is characterized in that:
By increasing oxidizing substance needed for denitrification in homogeneous unit or anoxic unit, tame denitrifying bacterium in advance,
Sludge settling property in precipitation unit is improved by adding iron compound to the outlet of homogeneous unit or anoxic unit or aerobic unit or aerobic unit,
By add alkaline matter eliminate except ironic hydroxide except added by iron compound iron ion to the suppression of denitrification and nitration reaction.
On the basis of technique scheme, needed for described denitrification, oxidizing substance is: containing the material of high-valence state nitrogen.
On the basis of technique scheme, the described material containing high-valence state nitrogen is the material containing nitrate radical or nitrite anions, as the waste water containing nitrate radical and/or nitrite anions or the solid containing nitrate radical and/or nitrite anions or liquid or waste liquid.
On the basis of technique scheme, described iron compound includes but not limited to: containing ironic hydroxide or ferrous sulfate or ferric sulfate or iron(ic) chloride or containing the suspension liquid of the arbitrary above-mentioned substance of proportioning or liquid or solid or waste liquid or waste water.
On the basis of technique scheme, when the iron compound added contains material beyond ironic hydroxide, keep biochemical unit pH value in 6 ~ 9 scopes by adding alkaline matter.
On the basis of technique scheme, described alkaline matter includes but not limited to: sodium carbonate solution or sodium hydroxide solution or sodium hydrogen carbonate solution or the solution containing the arbitrary above-mentioned alkaline matter of proportioning.
On the basis of technique scheme, denitrification-between the nitrated biochemical treatment system starting period, waste water progressively adds homogeneous unit by control sequence and flow, at the end of denitrification-nitrated biochemical treatment system starts, the water quality characteristic entering the homogeneous waste water of anoxic unit is:
Ammonia nitrogen concentration is 60 ~ 330mg/L,
COD concentration is 300 ~ 1500mg/L,
PH value between 6 ~ 9,
Homogeneous waste water has biodegradability, and biodegradability BOD and COD ratio represents, BOD and COD ratio >=0.3.
On the basis of technique scheme, denitrification-be point to biochemical unit to add kind of a mud between the nitrated biochemical treatment system starting period, little by little increase and enter the waste strength of biochemical unit or flow or kind, kind of mud is cultivated and tamed, until it adapts to target waste strength and flow completely;
Denitrification-nitrated biochemical treatment system starts end and refers to that kind of mud can adapt to target waste strength and kind and flow completely, index be the waste strength entering homogeneous unit, flow and kind in target zone and denitrification-nitrated biochemical treatment system water outlet reach in target call situation and run more than 2 weeks continuously, and sludge concentration can maintain more than 1.5g/L.
On the basis of technique scheme, concrete steps are:
Step 1, waste water introduces homogeneous unit: when having multiply intake, can introduce multiply in proportion and intake between the starting period, or first introduces easy biochemical waste water and introduce that concentration is higher, the poorer waste water of biochemical again according to the method in step 8 successively;
Step 2, denitrification-used kind of nitrated biochemical treatment system mud is added in anoxic unit and/or aerobic unit, the water in clear water or homogeneous unit is added in anoxic unit and aerobic unit, open aerobic unit Air supply facility and anoxic unit stirring facility, mud and water or waste water in anoxic unit and aerobic unit are mixed, makes always to reach 1 ~ 6g/L by filtration residue in pond;
Step 3, opens mixed-liquor return;
Step 4, outlet to homogeneous unit or anoxic unit or aerobic unit or aerobic unit is disposable to add containing ironic hydroxide or ferrous sulfate or ferric sulfate or iron(ic) chloride or containing the suspension liquid of the arbitrary above-mentioned substance of proportioning or liquid or solid or waste liquid or waste water, the add-on of ferro element be after adding ferro element in biochemical unit always can not filtration residue amount 1 ~ 31%;
Step 5, adds the material containing high-valence state nitrogen to homogeneous unit, makes the ratio of COD concentration and high-valence state nitrogen total concn in homogeneous unit structures be 1 ~ 6;
Stopping to the opportunity that homogeneous unit adds containing the material of high-valence state nitrogen is: in step 8 implementation process, in aerobic unit ammonia nitrogen concentration reduce or aerobic unit in the concentration of nitrate nitrogen higher than nitrate nitrogen in homogeneous unit and cultured water total concn time, or mud and muddy water mixed solution backflow itself are when can cause the ratio of COD concentration and high-valence state nitrogen total concn in homogeneous unit structures to be 1 ~ 6, or when cultured water concentration is higher than COD concentration in homogeneous unit, can stops or reducing the material added containing high-valence state nitrogen;
Step 6, the water outlet of homogeneous unit is introduced anoxic unit and controls flow, and the muddy water mixed solution of anoxic unit flows into aerobic unit, and the muddy water mixed solution inflow precipitation unit of aerobic unit, to covering sludge reflux tube inlet, namely opens sludge reflux;
Step 7, adjustment Air supply facility makes aerobic unit outlet dissolved oxygen concentration reach 2 ~ 7mg/L;
Step 8, continuum micromeehanics continuous effluent is run, the water outlet of monitoring precipitation unit, treat its COD index reach water outlet requirement 160% within and within ammonia nitrogen index reaches water outlet requirement 120%, increase the kind of waste water that enters homogeneous unit or improve 1.2 ~ 3 times that the flow of waste water of introducing homogeneous unit and concentration to the product of flow and concentration is original value, the mud of anoxic unit and aerobic unit is tamed;
Biochemical unit pH is adjusted in 6 ~ 9 scopes with alkaline matter in operation;
Adjusting Air supply facility in operation keeps aerobic unit outlet dissolved oxygen concentration to reach 2 ~ 7mg/L;
Step 9, enter the concentration of the waste water of homogeneous unit and flow and kind and reach target zone, precipitation unit water outlet reaches target call in continuous more than 2 weeks, and sludge concentration can maintain more than 1.5g/L, starts and terminates.
On the basis of technique scheme, clear water or other lower concentration drainings can be added to homogeneous unit or anoxic unit or aerobic unit between the starting period, reduce the initial COD concentration of biochemical unit to 2 times of its precipitation unit water outlet target value to 4 times, reduce ammonia nitrogen concentration to 2 times of its precipitation unit water outlet target value to 4 times.
On the basis of technique scheme, in order to eliminate the suppression of iron ion to denitrification and nitration reaction, except the iron compound added is except the situation of ironic hydroxide, the interpolation with iron compound also adds alkaline matter simultaneously, and addition method is:
When adding iron compound to homogeneous unit, regulate to biochemical unit water inlet pH value to >=6.0 by adding alkaline matter to homogeneous unit,
When adding iron compound to the outlet of anoxic unit or aerobic unit or aerobic unit, keep biochemical unit pH value >=6.0 by adding alkaline matter to this unit or homogeneous unit.
On the basis of technique scheme, denitrification-used kind of nitrated biochemical treatment system mud is municipal sewage plant mud, industrial effluent treatment plant's mud, anaerobic reactor discharge one of any in mud or the mixture of two kinds and the arbitrary above-mentioned mud of above proportioning.
The method of quick startup denitrification-nitrated biochemical treatment system of the present invention, simultaneously containing when starting denitrification-nitrated biochemical treatment system when high-enriched organics and ammonia nitrogen in high density in biochemical unit object water inlet, ensure the quick startup of anti-nitre-nitrated biochemical treatment system, when using same kind mud and water inlet program starts denitrification-nitrated biochemical treatment system, use the method that provides of the present invention can shift to an earlier date the time at least three weeks and complete startup, between the starting period, standard water discharge rate significantly improves.
The present invention by increasing oxidizing substance needed for denitrification-containing the material of the high-valence state such as nitrate radical or nitrite anions nitrogen in homogeneous unit or anoxic unit, tame denitrifying bacterium in advance, accelerate the startup of system denitrification biochemical function, solve denitrifying bacterium domestication and be later than nitrobacteria and tame the problem that between starting period of causing, aerobic unit organic loading is high and then biochemical unit nitrobacteria ratio is low;
Improving sludge settling property in precipitation unit by adding iron compound to the outlet of homogeneous unit or anoxic unit or aerobic unit or aerobic unit, to have contained in precipitation unit the smooth and sludge loss problem of sludge reflux;
Simultaneously, in order to avoid the suppression added denitrification and nitrated biochemical reaction of the molysite beyond ironic hydroxide, keep biochemical unit pH value in 6 ~ 9 scopes by adding alkaline matter (sodium carbonate solution or sodium hydroxide solution or sodium hydrogen carbonate solution or the waste liquid containing the arbitrary above-mentioned alkaline matter of proportioning) simultaneously, eliminate and add molysite beyond ironic hydroxide to the impact of denitrification-nitrated biochemical reaction;
By adopting above measure to start denitrification-nitrated biochemical treatment system, obtain the effect of the fast and stable startup being better than conventional Starting mode, and between the starting period, standard water discharge rate improves.
Accompanying drawing explanation
The present invention has following accompanying drawing:
Fig. 1 is conventional denitrification-nitrated biochemical treatment system schematic flow sheet.
Fig. 2 is quick startup denitrification of the present invention-nitrated biochemical treatment system schematic flow sheet.
All the standard elements such as pre-treatment are eliminated in note 1: Fig. 1,2, eliminate multipoint water feeding, the routine operation details such as multiply water inlet, pH regulator, nutritive salt add, multi-stage aeration, but the selectivity not affecting various standard element and working method uses and associativity use.
Waste water in note 2: Fig. 1,2 can be multiply sewage or waste water, combined sewage or waste water.Such as: can be the multiply waste water that multiple production equipment is discharged, or the composite waste of waste water discharged by multiple production equipment, or municipal effluent, or be mixed into the multiply waste water of municipal effluent, or be mixed into the composite waste of municipal effluent.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The start-up course of the present invention to the denitrification-nitrated biochemical treatment system of routine is as shown in Figure 1 studied.In the denitrification-nitrated biochemical treatment system of routine, oxidizing substance needed for denitrification in anoxic unit---the high-valence state such as nitrate radical or nitrite anions nitrogen, from the product of the lower valency such as ammonia nitrogen or blood urea nitrogen nitrogen at aerobic unit nitration oxidation, conventional start-up course first cultivates domestication nitrifier naturally to finite concentration, the oxidizing substances such as the nitrate radical of system or nitrite anions could be cultivated after having certain generation speed and tame out denitrifying bacteria, as 201010136902.X(CN101774693B) etc. Starting mode, the appearance of denitrification biochemical reaction must be later than the generation of nitrated biochemical reaction, 200910219411.9 and 200710010384.5(CN101239751) nitrifier cultivated is when starting for denitrification-nitrated biochemical treatment system, the denitrifying capacity of system also still needs to be obtained by the domestication of certain hour.Therefore the effect of denitrification organics removal of conventional denitrification-between the nitrated biochemical treatment system starting period is little, aerobic bacteria is leaned on to remove, (biochemistry pool generally comprises oxygen compatibility pool and aeration tank to biochemistry pool, in denitrification-nitrated biochemical treatment system, mud returns oxygen compatibility pool, flow into aeration tank again, in oxygen compatibility pool and aeration tank mud, contain substantially isocyatic denitrifying bacteria, nitrifier and aerobic bacteria simultaneously.) in the concentration of aerobic bacteria higher than concentration during normal operation, and nitrifier concentration is lower than concentration during normal operation, naturally reduces the ratio of biochemical unit nitrobacteria, adds the difficulty of biochemical unit cultivation in system itself and reservation nitrobacteria.
The present invention also finds under study for action, when process contains the waste water of high-enriched organics and ammonia nitrogen in high density simultaneously, in the process of start-up and operation denitrification-nitrated biochemical treatment system, there is serious Mud up-floating problem in precipitation unit, mud floats from precipitation unit and then runs off with water outlet, and first cause water outlet SS not up to standard, biochemistry pool mud reduces then, biochemical reaction weakens, and water outlet COD, ammonia nitrogen etc. are not up to standard.The detailed process of precipitation unit generation sludge loss is: after system has denitrifying capacity, cause in precipitation unit and denitrification can occur, thus mud flco or mud bed gassiness in precipitation unit, cause sludge reflux not smooth until Mud up-floating, mud runs off with scraping slag operation, even if cause time serious stopping discharging excess sludge, system sludge does not also increase age; Mud runs off with water outlet simultaneously, and now go out water suspension and raise, going out water suspension (SS) may exceed emission standard.The precipitation unit sludge loss problem that denitrification causes must solve, and just can make denitrification-smooth start-up and operation of nitrated biochemical treatment system.
As shown in Figure 2, the method for quick startup denitrification-nitrated biochemical treatment system of the present invention, comprises the following steps:
Simultaneously containing when starting denitrification-nitrated biochemical treatment system when high-enriched organics and ammonia nitrogen in high density in biochemical unit object water inlet:
By adding oxidizing substance needed for denitrification-containing the material of high-valence state nitrogen (containing the material of nitrate radical or nitrite anions in homogeneous unit or anoxic unit, as the waste water containing nitrate radical and/or nitrite anions or the solid containing nitrate radical/or nitrite anions or liquid or waste liquid), tame denitrifying bacteria in advance, accelerate the startup of system denitrification biochemical function, solve denitrifying bacterium domestication and be later than nitrobacteria and tame the problem that between starting period of causing, aerobic unit organic loading is high and then biochemical unit nitrobacteria ratio is low;
Improving sludge settling property in precipitation unit by adding iron compound to the outlet of homogeneous unit or anoxic unit or aerobic unit or aerobic unit, to have contained in precipitation unit the smooth and sludge loss problem of sludge reflux; Described iron compound includes but not limited to: containing ironic hydroxide or ferrous sulfate or ferric sulfate or iron(ic) chloride or containing the suspension liquid of the arbitrary above-mentioned substance of proportioning or liquid or solid or waste liquid or waste water.Such as: containing the suspension liquid of ironic hydroxide or ferrous sulfate or ferric sulfate or iron(ic) chloride or liquid or solid or waste liquid or waste water, or: containing the arbitrary suspension liquid of proportionings two or more in ironic hydroxide, ferrous sulfate, ferric sulfate, iron(ic) chloride or liquid or solid or waste liquid or waste water.
When the iron compound added is containing beyond ironic hydroxide during material, keep biochemical unit pH value in 6 ~ 9 scopes by adding alkaline matter, object eliminates the suppression to denitrification and nitration reaction of iron ion in the iron compound (except ironic hydroxide) that adds.Described alkaline matter includes but not limited to: sodium carbonate solution or sodium hydroxide solution or sodium hydrogen carbonate solution, or containing the solution of the arbitrary above-mentioned alkaline matter of proportioning.Such as: containing the arbitrary solution of proportionings two or more in sodium carbonate, sodium hydroxide, sodium bicarbonate.
By adopting above measure, denitrification-nitrated biochemical treatment system obtains the effect of the fast and stable startup being better than conventional Starting mode.
On the basis of technique scheme, denitrification-between the nitrated biochemical treatment system starting period, waste water progressively adds homogeneous unit by control sequence and flow, at the end of denitrification-nitrated biochemical treatment system starts, the water quality characteristic entering the homogeneous waste water of anoxic unit is: ammonia nitrogen concentration is 60 ~ 330mg/L, COD concentration is 300 ~ 1500mg/L, and pH value is between 6 ~ 9, and homogeneous waste water has biodegradability, its biodegradability BOD and COD ratio represents, its BOD and COD ratio (B/C) >=0.3.
Denitrification-refer between the nitrated biochemical treatment system starting period: add kind of a mud to biochemical unit, little by little increases and enters the waste strength of biochemical unit or flow or kind, cultivate and tame, until it adapts to target waste strength and flow completely to kind of mud;
Denitrification-nitrated biochemical treatment system starts end and refers to: plant mud and can adapt to target waste strength and kind and flow completely, index be the waste strength entering homogeneous unit, flow and kind in target zone and denitrification-nitrated biochemical treatment system water outlet reach in target call situation and run more than 2 weeks continuously, and sludge concentration can maintain more than 1.5g/L.
On the basis of technique scheme, the concrete steps starting denitrification-nitrated biochemical treatment system are fast:
Step 1, waste water introduces homogeneous unit: when having multiply intake, can introduce multiply in proportion and intake between the starting period, or first introduces easy biochemical waste water and introduce that concentration is higher, the poorer waste water of biochemical again according to the method in step 8 successively;
Clear water or other lower concentration drainings can be added to homogeneous unit or anoxic unit or aerobic unit between the starting period, reduce the initial COD concentration of biochemical unit to 2 times of its precipitation unit water outlet target value to 4 times, reduce ammonia nitrogen concentration to 2 times of its precipitation unit water outlet target value to 4 times;
Step 2, denitrification-used kind of nitrated biochemical treatment system mud is added in anoxic unit and/or aerobic unit, denitrification-used kind of nitrated biochemical treatment system mud can be municipal sewage plant mud (municipal sewage plant mud, the excess sludge as after the mud mixture in oxygen compatibility pool (anoxic pond), aeration tank, digester or excess sludge or dehydration), industrial effluent treatment plant's mud, anaerobic reactor discharge one of any in mud or the mixture of two kinds and the arbitrary above-mentioned mud of above proportioning; The water in clear water or homogeneous unit is added in anoxic unit and aerobic unit; Open aerobic unit Air supply facility and anoxic unit stirring facility, mud and water or waste water in anoxic unit and aerobic unit are mixed, make always to reach 1 ~ 6g/L by filtration residue (namely water sample stays material on the filter after quantitative paper filters, in 103 ~ 105 DEG C of amounts obtained that dry to constant weight) in pond;
Step 3, opens mixed-liquor return;
Step 4, outlet to homogeneous unit or anoxic unit or aerobic unit or aerobic unit is disposable to add containing ironic hydroxide or ferrous sulfate or ferric sulfate or iron(ic) chloride or containing the suspension liquid of the arbitrary above-mentioned substance of proportioning or liquid or solid or waste liquid or waste water, the add-on of ferro element (characterizes with total iron, see GB14506.5-2010) in biochemical unit after adding ferro element always can not filtration residue amount (namely water sample stays material on the filter after filtering, in 103 ~ 105 DEG C of amounts obtained that dry to constant weight) 1 ~ 31%;
In order to eliminate the suppression of iron ion to denitrification and nitrated biochemical reaction, except the iron compound added is except the situation of ironic hydroxide, the interpolation with iron compound also adds alkaline matter simultaneously, and addition method is:
When adding iron compound to homogeneous unit, regulate to biochemical unit water inlet pH value to >=6.0 by adding alkaline matter to homogeneous unit,
When adding iron compound to the outlet of anoxic unit or aerobic unit or aerobic unit, keep biochemical unit pH value >=6.0 by adding alkaline matter to this unit or homogeneous unit;
Iron adds that concentration is higher, and alkaline matter add-on is larger, and alkaline matter can be sodium carbonate solution or sodium hydroxide solution or sodium hydrogen carbonate solution or the waste liquid containing the arbitrary above-mentioned alkaline matter of proportioning;
Step 5, adds the material containing high-valence state nitrogen to homogeneous unit, makes the ratio of COD concentration and high-valence state nitrogen total concn in homogeneous unit structures be 1 ~ 6;
With the raising of step 8 kind of waste water, organic concentration, that notes increase high-valence state nitrogen adds total amount;
Stopping to the opportunity that homogeneous unit adds containing the material of high-valence state nitrogen is: in step 8 implementation process, in aerobic unit ammonia nitrogen concentration reduce or aerobic unit in the concentration of nitrate nitrogen higher than nitrate nitrogen in homogeneous unit and cultured water total concn time, or mud and muddy water mixed solution backflow itself are when can cause the ratio of COD concentration and high-valence state nitrogen total concn in homogeneous unit structures to be 1 ~ 6, or when in homogeneous unit, cultured water concentration is higher than COD concentration, can stop or reducing adding containing high-valence state nitrogen material;
By adding oxidizing substance needed for denitrification (referring to the material containing nitrate radical or nitrite anions), high-valence state nitrogen in increase system, carry out the domestication of denitrifying bacteria in advance, solve denitrifying bacteria domestication between the starting period and be later than nitrifier domestication, in aerobic unit, the concentration of aerobic bacteria is higher than concentration during normal operation, and nitrifier concentration is lower than the problem of concentration during normal operation;
Step 6, the water outlet of homogeneous unit is introduced anoxic unit and controls flow, and the muddy water mixed solution of anoxic unit flows into aerobic unit, and the muddy water mixed solution inflow precipitation unit of aerobic unit, to covering sludge reflux tube inlet, namely opens sludge reflux;
Step 7, adjustment Air supply facility makes aerobic unit outlet dissolved oxygen concentration reach 2 ~ 7mg/L;
Step 8, continuum micromeehanics continuous effluent is run, the water outlet of monitoring precipitation unit, treat its COD index reach water outlet requirement 160% within (containing 160%) and ammonia nitrogen index reach water outlet requirement 120% within (containing 120%), increase the kind of waste water that enters homogeneous unit or improve 1.2 ~ 3 times that the flow of waste water of introducing homogeneous unit and concentration to the product of flow and concentration is original value, the mud of anoxic unit and aerobic unit is tamed;
Biochemical unit pH is adjusted in 6 ~ 9 scopes with alkaline matter in operation;
Adjusting Air supply facility in operation keeps aerobic unit outlet dissolved oxygen concentration to reach 2 ~ 7mg/L;
Step 9, enter the concentration of the waste water of homogeneous unit and flow and kind and reach target zone, precipitation unit water outlet reaches target call in continuous more than 2 weeks, and sludge concentration can maintain more than 1.5g/L, starts and terminates.
The invention has the advantages that:
1, add the high-valence state such as nitrate radical or nitrite anions nitrogen, the denitrification function of system and nitrification function are tamed simultaneously, solves the problem that between the starting period, biochemical unit nitrobacteria ratio is low;
2, at iron compounds such as the disposable interpolation ironic hydroxides of initial start stage, cause the add-on of ferro element to account in biochemical unit always can not filtration residue amount 1 ~ 31%, inhibit rapidly mud in the floating of second pond and loss;
3, keeping biochemical unit pH value in 6 ~ 9 scopes by adding alkaline matter, eliminating and adding molysite to the impact of biochemical reaction;
By adopting above startup measure, denitrification-nitrated biochemical treatment system obtains the effect of the fast and stable startup being better than conventional Starting mode, started early more than 3 weeks, and between the starting period, standard water discharge rate improves.
Be below specific embodiment:
Embodiment 1
Technical solution of the present invention is about 20t/h for the treatment of cyclohexanone production apparatus discharge waste water, coal gasification apparatus discharge waste water is about 80t/h and municipal effluent is about 200t/h, cyclohexanone production apparatus is discharged waste water COD and is about 1500mg/L, waste water COD is about 1000mg/L, ammonia nitrogen is about 700mg/L in coal gasification apparatus discharge, municipal effluent COD is about 300mg/L, and ammonia nitrogen is about 30mg/L; Oxygen compatibility pool and aeration tank cubic capacity are 8000m
3; It is 400 ~ 700mg/L, NH that 3 strands of waste water are mixed into anoxic unit waste water COD in homogeneous pond
3-N is 100 ~ 250mg/L, B/C is 0.5 ~ 0.7; Water outlet requires COD≤60mg/L, NH
3-N≤15mg/L; Planting mud is municipal sewage plant excess sludge; Improve that to enter the opportunity that the wastewater flow of homogeneous pond structures or increase enter the kind of waste water of homogeneous pond structures be that precipitation unit effluent COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L.
Start-up course is as follows:
First introduce municipal effluent 100t/h to homogeneous pond, municipal sewage plant excess sludge is added to expiring pond to oxygen compatibility pool and aeration tank, unlatching oxygen compatibility pool stirs facility and aeration tank Air supply facility makes mud and waste water mix, open mixed-liquor return, now in oxygen compatibility pool and aeration tank always can not filtration residue amount be 6g/L(and seed sludge amount be 6g/L), sludge volume index (SVI) is 150ml/g, dissolve iron vitriol 2438kg, form solution 50m
3, add in homogeneous pond, dissolve powdered sodium carbonate 1100kg simultaneously, form solution 50m
3, add homogeneous pond, in homogeneous pond, pH is maintained 6.0 ~ 7.5, the waste water containing nitrate radical after neutralization of nitric acid production plant discharge is added (substantially not containing organism to homogeneous pond, the SODIUMNITRATE of composition mainly about 1.5wt%) 6.5 ~ 14t/h, the waste water the concentration of nitrate nitrogen making homogeneous pond flow to oxygen compatibility pool is about 150 ~ 300mg/L, and in the structures of homogeneous pond, the ratio of COD concentration and the concentration of nitrate nitrogen is about 1 ~ 2, flow into oxygen compatibility pool until homogeneous pond waste water cause aeration tank mud mixture to flow into precipitation unit and after covering sludge reflux tube inlet, open sludge reflux, adjustment Air supply facility makes aeration tank outlet dissolved oxygen concentration reach 2 ~ 7mg/L, start continuum micromeehanics continuous effluent to run, now monitor aeration tank sludge volume index (SVI, also can be described as sludge settling ratio) be 140ml/g, measure ferro element add-on be now in biochemistry pool always can not filtration residue 1%, the water outlet of monitoring precipitation unit, determine after 3 days that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, improve municipal effluent add-on and be about 200t/h to target value, namely the waste strength and the flow product that enter homogeneous pond are increased to original 2 times, the add-on improved containing nitrate radical waste water is original 2 times simultaneously, the ratio of COD concentration and the concentration of nitrate nitrogen in the structures of homogeneous pond is made to keep being about 1 ~ 2, the water outlet of monitoring precipitation unit, determine after 3 days that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, and increase coal gasification waste water 20t/h, the ammonia nitrogen in waste water concentration and the flow product that namely enter homogeneous pond are increased to original 3 times, the water outlet of monitoring precipitation unit, determine after 1 week that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, increases coal gasification waste water to 80t/h, stop adding containing nitrate radical waste water simultaneously, add sodium hydrogen carbonate solution and maintain aerobic unit pH>=6.3, the water outlet of monitoring precipitation unit, determine after 2 weeks that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, adds cyclohexanone production apparatus discharge waste water and is about 20t/h, the water outlet of monitoring precipitation unit, determine after 3 days that its COD reaches below 80mg/L and ammonia nitrogen concentration reaches below 15mg/L and maintains continuous 2 weeks, always filtration residue amount can not be about 4.2g/L in biochemistry pool, sludge settling ratio (SVI) is 165ml/g, start and terminate, about 6 weeks consuming time.
Comparative example 1
With flow condition, the startup of seed sludge condition of embodiment 1, but do not add nitrate radical and ferro element.
Correlation technique scheme is about 20t/h for the treatment of cyclohexanone production apparatus discharge waste water, coal gasification apparatus discharge waste water is about 80t/h and municipal effluent is about 200t/h, cyclohexanone production apparatus is discharged waste water COD and is about 1500mg/L, waste water COD is about 1000mg/L, ammonia nitrogen is about 700mg/L in coal gasification apparatus discharge, municipal effluent COD is about 300mg/L, and ammonia nitrogen is about 30mg/L; Oxygen compatibility pool and aeration tank cubic capacity are 8000m
3; It is 700 ~ 1000mg/L, NH that 3 strands of waste water are mixed into anoxic unit waste water COD in homogeneous pond
3-N is 150 ~ 220mg/L, B/C is 0.5 ~ 0.7; Water outlet requires COD≤60mg/L, NH
3-N≤15mg/L; Planting mud is municipal sewage plant excess sludge.Improve that to enter the opportunity that the wastewater flow of homogeneous pond structures or increase enter the kind of waste water of homogeneous pond structures be that precipitation unit effluent COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L.
Start-up course is as follows:
First introduce municipal effluent 100t/h to homogeneous pond; Municipal sewage plant excess sludge is added to expiring pond to oxygen compatibility pool and aeration tank; Unlatching oxygen compatibility pool stirs facility and aeration tank Air supply facility makes mud and waste water mix, open mixed-liquor return, can not filtration residue amount be always now 6g/L in oxygen compatibility pool and aeration tank, sludge volume index (SVI also can be described as sludge settling ratio) be 150ml/g; Flow into oxygen compatibility pool until homogeneous pond waste water cause aeration tank mud mixture to flow into precipitation unit and after covering sludge reflux tube inlet, open sludge reflux; Adjustment Air supply facility makes aeration tank outlet dissolved oxygen concentration reach 2 ~ 7mg/L; Start continuum micromeehanics continuous effluent to run, now monitoring aeration tank sludge volume index (SVI) is 165ml/g, the water outlet of monitoring precipitation unit, determine after 5 days that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, improve municipal effluent add-on and be about 200t/h to target value, the waste strength and the flow product that namely enter homogeneous pond are increased to original 2 times; The water outlet of monitoring precipitation unit, determine after 5 days that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, and increase coal gasification waste water 20t/h, the ammonia nitrogen in waste water concentration and the flow product that namely enter homogeneous pond are increased to original 3 times; The water outlet of monitoring precipitation unit, within 1 week, postprecipitation unit there occurs Mud up-floating, and continue operation and determine after 2 weeks that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, increases coal gasification waste water to 80t/h; The water outlet of monitoring precipitation unit, have when going out water suspension and exceed standard, add sodium hydrogen carbonate solution and maintain aerobic unit pH >=6.3, after 4 weeks, determine that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, adds cyclohexanone production apparatus discharge waste water and is about 20t/h; The water outlet of monitoring precipitation unit, determine after 1 week that its COD reaches below 80mg/L and ammonia nitrogen concentration reaches below 15mg/L and maintains continuous 2 weeks, always filtration residue amount can not be about 2.9g/L in biochemistry pool, sludge settling ratio (SVI) is 260ml/g, start and terminate, about 11.5 weeks consuming time.Start length consuming time 5 weeks than embodiment 1, and at the end of between poorer than embodiment 1, the biochemical unit sludge quantity of sludge settling property few, starting period water outlet cause compliance rate because SS exceeds standard comparatively embodiment be low by 30%.
Embodiment 2
Technical solution of the present invention is about 10L/d for the treatment of cyclohexanone production apparatus discharge waste water, coal gasification apparatus discharge waste water is about 40L/d, rubber antiager RD production equipment discharge waste water is about 5L/d and recirculated cooling water sewer is about 100L/d, cyclohexanone production apparatus is discharged waste water COD and is about 1500mg/L, waste water COD is about 1000mg/L, ammonia nitrogen is about 500 ~ 700mg/L in coal gasification apparatus discharge, rubber antiager RD production equipment is discharged waste water COD and is about 9000 ~ 15000mg/L, and recirculated cooling water sewer COD is about 80mg/; Anoxic unit and the total useful volume of aerobic unit are 250L; It is 550 ~ 1000mg/L, NH that 4 strands of waste water are mixed into anoxic unit waste water COD in homogeneous pond
3-N is 100 ~ 200mg/L, B/C is 0.3 ~ 0.5; Water outlet requires COD≤80mg/L, NH
3-N≤15mg/L; Planting mud is industrial effluent treatment plant's anoxic pond mud; Improving the wastewater flow opportunity entering homogeneous unit structures is that precipitation unit effluent COD concentration reaches below 128mg/L, ammonia nitrogen concentration reaches below 18mg/L.
Start-up course is as follows:
First introduce each stock waste water in the treatment capacity ratio of each stock waste water to homogeneous unit, make its COD, ammonia nitrogen concentration, pH value reach target inflow requirement; Mud mixture is added in industrial effluent treatment plant's anoxic pond mud to 95% of pond useful volume to biochemical unit; Unlatching anoxic unit stirs facility and aerobic unit Air supply facility makes mud and waste water mix, open mixed-liquor return, can not filtration residue amount be always now 3.4g/L in anoxic unit and aerobic unit, sludge volume index (SVI also claims sludge settling ratio) be 278ml/g; Add the suspension liquid (this is suspended the filter cake after from the press filtration of chlorobenzene production device waste water neutralize and uses water-dispersion again) containing ironic hydroxide to anoxic and aerobic unit and evenly spread to biochemical unit, now monitoring aeration tank mud, to amass index (SVI) be 140ml/g, measure ferro element add-on be now in biochemistry pool always can not filtration residue 20%; Add homogeneous unit by after SODIUMNITRATE dissolution of solid, make homogeneous pond flow to the concentration of nitrate nitrogen in the waste water of oxygen compatibility pool and be about 240 ~ 340mg/L, in homogeneous unit structures, the ratio of COD concentration and the concentration of nitrate nitrogen is about 2 ~ 3; Flow into oxygen compatibility pool until homogeneous pond waste water cause aeration tank mud mixture to flow into precipitation unit and after covering sludge reflux tube inlet, open sludge reflux; Adjustment Air supply facility makes aeration tank outlet dissolved oxygen concentration reach 2 ~ 7mg/L; Start continuum micromeehanics 10L/d to run, the water outlet of monitoring precipitation unit, determine after 18 days that its COD concentration reaches below 128mg/L, ammonia nitrogen concentration reaches below 18mg/L, improve flooding quantity to about 20L/d, namely the waste strength and the flow product that enter homogeneous pond are increased to original 2 times, maintain SODIUMNITRATE add-on constant, make the ratio of COD concentration and the concentration of nitrate nitrogen in homogeneous unit structures be about 4 ~ 6; Continue the water outlet of monitoring precipitation unit, determine after 10 days that its COD concentration reaches below 128mg/L, ammonia nitrogen concentration reaches below 18mg/L, improve flooding quantity to about 60L/d, raising SODIUMNITRATE add-on is 2 times on last stage simultaneously, makes the ratio of COD concentration and the concentration of nitrate nitrogen in homogeneous unit structures be about 2.7 ~ 4; Continue the water outlet of monitoring precipitation unit, determine after 10 days that its COD concentration reaches below 128mg/L, ammonia nitrogen concentration reaches below 18mg/L, improves flooding quantity and is about 155L/d to target value, stop adding of SODIUMNITRATE simultaneously; Continue the water outlet of monitoring precipitation unit, determine after 11 days that its COD concentration reaches below 80mg/L, ammonia nitrogen concentration reaches below 15mg/L, maintain water outlet up to standard and run 2 weeks continuously, always filtration residue amount 4.4g/L can not be about in biochemistry pool, sludge volume index (SVI) is 150ml/g, starts and terminates, 9 weeks consuming time.
Comparative example 2
With flow condition, the startup of seed sludge condition of embodiment 2, but do not add nitrate radical and ferro element.
Correlation technique scheme is about 10L/d for the treatment of cyclohexanone production apparatus discharge waste water, coal gasification apparatus discharge waste water is about 40L/d, rubber antiager RD production equipment discharge waste water is about 5L/d and recirculated cooling water sewer is about 100L/d, cyclohexanone production apparatus is discharged waste water COD and is about 1500mg/L, waste water COD is about 1000mg/L, ammonia nitrogen is about 500 ~ 700mg/L in coal gasification apparatus discharge, rubber antiager RD production equipment is discharged waste water COD and is about 15000mg/L, and recirculated cooling water sewer COD is about 80mg/; Anoxic unit and the total useful volume of aerobic unit are 250L; It is 550 ~ 1000mg/L, NH that 4 strands of waste water are mixed into anoxic unit waste water COD in homogeneous pond
3-N is 100 ~ 200mg/L, B/C is 0.3 ~ 0.5; Water outlet requires COD≤80mg/L, NH
3-N≤15mg/L; Planting mud is industrial effluent treatment plant's anoxic pond mud; Improving the wastewater flow opportunity entering homogeneous unit structures is that precipitation unit effluent COD concentration reaches below 128mg/L, ammonia nitrogen concentration reaches below 18mg/L.
Start-up course is as follows:
First introduce each stock waste water in the treatment capacity ratio of each stock waste water to homogeneous unit, make its COD, ammonia nitrogen concentration, pH value reach target inflow requirement, mud mixture is added in industrial effluent treatment plant's anoxic pond mud to 95% of pond useful volume to biochemical unit, unlatching anoxic unit stirs facility and aerobic unit Air supply facility makes mud and waste water mix, open mixed-liquor return, can not filtration residue amount be always now 3.4g/L in anoxic unit and aerobic unit, sludge volume index (SVI also claims sludge settling ratio) be 278ml/g, flow into oxygen compatibility pool until homogeneous pond water waste water cause aeration tank mud mixture to flow into precipitation unit and after covering sludge reflux tube inlet, open sludge reflux, adjustment Air supply facility makes aeration tank outlet dissolved oxygen concentration reach 2 ~ 7mg/L, start continuum micromeehanics 10L/d to run, the water outlet of monitoring precipitation unit, determine after 21 days that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, improve flooding quantity to about 20L/d, the waste strength and the flow product that namely enter homogeneous pond are increased to original 2 times, continue the water outlet of monitoring precipitation unit, still can not determine after 14 days that its COD concentration reaches below 128mg/L, ammonia nitrogen concentration reaches below 18mg/L, but sludge concentration only surplus 1.2g/L in biochemistry pool, mud SVI reaches 400ml/g, continues to improve flooding quantity to about 60L/d, continue the water outlet of monitoring precipitation unit, determine after 28 days that its COD concentration reaches below 128mg/L, ammonia nitrogen concentration reaches below 18mg/L, but sludge settling ratio (SVI) reaches 480ml/g, improves flooding quantity and is about 155L/d to target value, continue the water outlet of monitoring precipitation unit, determine after 21 days that its COD concentration reaches below 80mg/L, ammonia nitrogen concentration reaches below 15mg/L, maintain water outlet up to standard and run 2 weeks continuously, always filtration residue amount 1.9g/L can not be about in biochemistry pool, sludge volume index (SVI) is 400ml/g, start and terminate, 14 weeks consuming time, length consuming time 5 weeks are started than embodiment 2, at the end of sludge settling property poorer than embodiment 2, biochemical unit sludge quantity is few, and sludge settling property causes the mud mixture when practical application in industry to be difficult to be separated in precipitation unit and carry out sludge reflux in start-up course.
Embodiment 3
Technical solution of the present invention is about 10L/d for the treatment of coal gasification apparatus discharge waste water and municipal effluent is about 100L/d, and waste water COD is about 1000mg/L, ammonia nitrogen is about 700mg/L in coal gasification apparatus discharge, and municipal effluent COD is about 300mg/L, and ammonia nitrogen is about 30mg/L; Oxygen compatibility pool and aeration tank cubic capacity are 60L; It is 300 ~ 400mg/L, NH that 2 strands of waste water are mixed into anoxic unit waste water COD in homogeneous pond
3-N is 60 ~ 120mg/L, B/C is 0.6 ~ 0.9; Water outlet requires COD≤60mg/L, NH
3-N≤15mg/L; Planting mud is municipal sewage plant digester mud; Improve that to enter the opportunity that the wastewater flow of homogeneous pond structures or increase enter the kind of waste water of homogeneous pond structures be that precipitation unit effluent COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L.
Start-up course is as follows:
First introduce each stock waste water in the treatment capacity ratio of each stock waste water to homogeneous unit, make its COD, ammonia nitrogen concentration, pH value reach target inflow requirement; Add municipal sewage plant digester mud to 17% of biochemical unit useful volume to biochemical unit, then add municipal effluent to 100% of useful volume; Unlatching anoxic unit stirs facility and aerobic unit Air supply facility makes mud and waste water mix, open mixed-liquor return, can not filtration residue amount be always now 1g/L in anoxic unit and aerobic unit, sludge volume index (SVI also claims sludge settling ratio) be 100ml/g; Add the iron(ic) chloride of dissolving and the sodium hydroxide of dissolving to homogeneous unit, in homogeneous unit, pH remains 7.0 ~ 8.5; Add homogeneous unit by after SODIUMNITRATE dissolution of solid, make homogeneous pond flow to the concentration of nitrate nitrogen in the waste water of oxygen compatibility pool and be about 120 ~ 150mg/L, in homogeneous unit structures, the ratio of COD concentration and the concentration of nitrate nitrogen is about 2.5 ~ 3; Treat that homogeneous pond water waste water flows into oxygen compatibility pool and causes aeration tank mud mixture to flow into precipitation unit, open sludge reflux; Adjustment Air supply facility makes aeration tank outlet dissolved oxygen concentration reach 2 ~ 7mg/L; Start continuum micromeehanics 30L/d to run, the water outlet of monitoring precipitation unit, determine after 7 days that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, detect ferro element add-on be now in biochemistry pool always can not filtration residue 31%, now monitoring aeration tank mud, to amass index (SVI) be 60ml/g; Improve flooding quantity to about 60L/d, the waste strength and the flow product that namely enter homogeneous pond are increased to original 2 times, maintain SODIUMNITRATE add-on constant, make the ratio of COD concentration and the concentration of nitrate nitrogen in homogeneous unit structures keep being about 5 ~ 6; Continue the water outlet of monitoring precipitation unit, determine after 10 days that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, improves flooding quantity and is about 110L/d to target value, stop adding of SODIUMNITRATE simultaneously; Continue the water outlet of monitoring precipitation unit, determine after 11 days that its COD concentration reaches below 60mg/L, ammonia nitrogen concentration reaches below 15mg/L, maintain water outlet up to standard and run 2 weeks continuously, always filtration residue amount 4.5g/L can not be about in biochemistry pool, sludge volume index (SVI) is 80ml/g, starts and terminates, 5 weeks consuming time.
Embodiment 4
Technical solution of the present invention is about 35L/d for the treatment of coal gasification apparatus discharge waste water and recirculated cooling water sewer is about 50L/d and waste water 0.75 ~ 1L/d discharged by 4-aminodiphenylamine production equipment and cyclohexanone production apparatus discharge waste water is about 6L/d, waste water COD is about 1000mg/L, ammonia nitrogen is about 700mg/L in coal gasification apparatus discharge, recirculated cooling water sewer COD is about 80mg/L, and 4-aminodiphenylamine production equipment is discharged waste water COD and is about 80000 ~ 110000mg/L; Oxygen compatibility pool and aeration tank cubic capacity are 75L; It is 1000 ~ 1500mg/L, NH that 4 strands of waste water are mixed into anoxic unit waste water COD in homogeneous pond
3-N is 160 ~ 330mg/L, B/C is 0.4 ~ 0.8; Water outlet requires COD≤80mg/L, NH
3-N≤15mg/L; Planting mud is municipal sewage plant excess sludge dehydrated sludge cake; Improve that to enter the opportunity that the wastewater flow of homogeneous pond structures or increase enter the kind of waste water of homogeneous pond structures be that precipitation unit effluent COD concentration reaches below 128mg/L, ammonia nitrogen concentration reaches below 18mg/L.
Start-up course is as follows:
First introduce each stock waste water in the treatment capacity ratio of each stock waste water to homogeneous unit, make its COD, ammonia nitrogen concentration, pH value reach target inflow requirement; Mud cake after adding the dehydration of municipal sewage plant excess sludge to biochemical unit, its Adding Way is: the mud cake being no more than 3 days the storage time is mixed into recirculated cooling water sewer, pump into through sludge delivery pump, then add recirculated cooling water sewer to 100% of useful volume; Unlatching anoxic unit stirs facility and aerobic unit Air supply facility makes mud and waste water mix, open mixed-liquor return, can not filtration residue amount be always now 4g/L in anoxic unit and aerobic unit, sludge volume index (SVI also can be described as sludge settling ratio) be 100ml/g; Add the ferric sulfate of dissolving and the sodium bicarbonate of dissolving to homogeneous unit, in homogeneous unit, pH remains 6.0 ~ 8.5; Add homogeneous unit by after SODIUMNITRATE dissolution of solid, make homogeneous pond flow to the concentration of nitrate nitrogen in the waste water of oxygen compatibility pool and be about 400 ~ 600mg/L, in homogeneous unit structures, the ratio of COD concentration and the concentration of nitrate nitrogen is about 2 ~ 3.7; Flow into oxygen compatibility pool until homogeneous pond water waste water cause aeration tank mud mixture to flow into precipitation unit and after covering sludge reflux tube inlet, open sludge reflux; Adjustment Air supply facility makes aerobic unit outlet dissolved oxygen concentration reach 2 ~ 7mg/L; Start continuum micromeehanics 10L/d to run, the water outlet of monitoring precipitation unit, determine after 7 days that its COD concentration reaches below 128mg/L, ammonia nitrogen concentration reaches below 18mg/L, detect ferro element add-on be now in biochemistry pool always can not filtration residue 9%, now monitoring aeration tank mud, to amass index (SVI) be 90ml/g; Improve flooding quantity to about 30L/d, namely the waste strength and the flow product that enter homogeneous pond are increased to original 3 times, raising SODIUMNITRATE add-on is 3 times on last stage simultaneously, makes the ratio of COD concentration and the concentration of nitrate nitrogen in homogeneous unit structures keep being about 2 ~ 3.7; Continue the water outlet of monitoring precipitation unit, determine after 14 days that its COD concentration reaches below 128mg/L, ammonia nitrogen concentration reaches below 18mg/L, improves flooding quantity and is about 90L/d to target value, within 3 days, stops adding of SODIUMNITRATE afterwards; Continue the water outlet of monitoring precipitation unit, determine after 14 days that its COD concentration reaches below 80mg/L, ammonia nitrogen concentration reaches below 15mg/L, maintain water outlet up to standard and run 2 weeks continuously, always filtration residue amount 4.5g/L can not be about in biochemistry pool, sludge volume index (SVI) is 100ml/g, starts and terminates, 7 weeks consuming time.
Embodiment 5
Technical solution of the present invention is about 10L/d for the treatment of coal gasification apparatus discharge waste water and municipal effluent is about 100L/d, and waste water COD is about 1000mg/L, ammonia nitrogen is about 700mg/L in coal gasification apparatus discharge, and municipal effluent COD is about 300mg/L, and ammonia nitrogen is about 30mg/L; Oxygen compatibility pool and aeration tank cubic capacity are 60L; It is 300 ~ 400mg/L, NH that 2 strands of waste water are mixed into anoxic unit waste water COD in homogeneous pond
3-N is 60 ~ 120mg/L, B/C is 0.6 ~ 0.9; Water outlet requires COD≤60mg/L, NH
3-N≤15mg/L; Planting mud is municipal sewage plant digester mud; Improve that to enter the opportunity that the wastewater flow of homogeneous pond structures or increase enter the kind of waste water of homogeneous pond structures be that precipitation unit effluent COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L.
Start-up course is as follows:
First introduce each stock waste water in the treatment capacity ratio of each stock waste water to homogeneous unit, make its COD, ammonia nitrogen concentration, pH value reach target inflow requirement; Add municipal sewage plant digester mud to 17% of biochemical unit useful volume to biochemical unit, then add municipal effluent to 100% of useful volume; Unlatching anoxic unit stirs facility and aerobic unit Air supply facility makes mud and waste water mix, open mixed-liquor return, can not filtration residue amount be always now 1g/L in anoxic unit and aerobic unit, sludge volume index (SVI also claims sludge settling ratio) be 100ml/g; Add the iron(ic) chloride of dissolving and the sodium hydroxide of dissolving to homogeneous unit, in homogeneous unit, pH remains 7.0 ~ 8.5; Add homogeneous unit by after Sodium Nitrite dissolution of solid, the waste water Central Asia the concentration of nitrate nitrogen making homogeneous pond flow to oxygen compatibility pool is about 200 ~ 250mg/L, and in homogeneous unit structures, the ratio of COD concentration and cultured water concentration is about 1.5 ~ 1.8; Treat that homogeneous pond water waste water flows into oxygen compatibility pool and causes aeration tank mud mixture to flow into precipitation unit, open sludge reflux; Adjustment Air supply facility makes aeration tank outlet dissolved oxygen concentration reach 2 ~ 7mg/L; Start continuum micromeehanics 30L/d to run, the water outlet of monitoring precipitation unit, determine after 7 days that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, detect ferro element add-on be now in biochemistry pool always can not filtration residue 31%, now monitoring aeration tank mud, to amass index (SVI) be 60ml/g; Improve flooding quantity to about 60L/d, the waste strength and the flow product that namely enter homogeneous pond are increased to original 2 times, maintain Sodium Nitrite add-on constant, make the ratio of COD concentration and cultured water concentration in homogeneous unit structures be about 3 ~ 3.6; Continue the water outlet of monitoring precipitation unit, determine after 10 days that its COD concentration reaches below 108mg/L, ammonia nitrogen concentration reaches below 18mg/L, improves flooding quantity and is about 110L/d to target value, stop adding of Sodium Nitrite simultaneously; Continue the water outlet of monitoring precipitation unit, determine after 11 days that its COD concentration reaches below 60mg/L, ammonia nitrogen concentration reaches below 15mg/L, maintain water outlet up to standard and run 2 weeks continuously, always filtration residue amount 4.5g/L can not be about in biochemistry pool, sludge volume index (SVI) is 80ml/g, starts and terminates, 5 weeks consuming time.
The content be not described in detail in this specification sheets belongs to the known prior art of professional and technical personnel in the field.
Claims (12)
1. one kind starts the method for denitrification-nitrated biochemical treatment system fast, described denitrification-nitrated biochemical treatment system is for the treatment of the waste water containing high-enriched organics and ammonia nitrogen in high density simultaneously, this system comprises: homogeneous unit, anoxic unit, aerobic unit and precipitation unit, anoxic unit and aerobic unit are referred to as biochemical unit, it is characterized in that:
By increasing oxidizing substance needed for denitrification in homogeneous unit or anoxic unit, tame denitrifying bacterium in advance,
Sludge settling property in precipitation unit is improved by adding iron compound to the outlet of homogeneous unit or anoxic unit or aerobic unit or aerobic unit,
By add alkaline matter eliminate except ironic hydroxide except added by iron compound iron ion to the suppression of denitrification and nitration reaction.
2. start the method for denitrification-nitrated biochemical treatment system as claimed in claim 1 fast, it is characterized in that: needed for described denitrification, oxidizing substance is: containing the material of high-valence state nitrogen.
3. start the method for denitrification-nitrated biochemical treatment system as claimed in claim 2 fast, it is characterized in that: the described material containing high-valence state nitrogen is the material containing nitrate radical or nitrite anions, as the waste water containing nitrate radical and/or nitrite anions or the solid containing nitrate radical and/or nitrite anions or liquid or waste liquid.
4. start as claimed in claim 1 the method for denitrification-nitrated biochemical treatment system fast, it is characterized in that: described iron compound includes but not limited to: containing ironic hydroxide or ferrous sulfate or ferric sulfate or iron(ic) chloride or containing the suspension liquid of the arbitrary above-mentioned substance of proportioning or liquid or solid or waste liquid or waste water.
5. starting the method for denitrification-nitrated biochemical treatment system as claimed in claim 4 fast, it is characterized in that: when the iron compound added contains material beyond ironic hydroxide, keeping biochemical unit pH value in 6 ~ 9 scopes by adding alkaline matter.
6. start as claimed in claim 5 the method for denitrification-nitrated biochemical treatment system fast, it is characterized in that: described alkaline matter includes but not limited to: sodium carbonate solution or sodium hydroxide solution or sodium hydrogen carbonate solution or the solution containing the arbitrary above-mentioned alkaline matter of proportioning.
7. start the method for denitrification-nitrated biochemical treatment system as claimed in claim 1 fast, it is characterized in that: denitrification-between the nitrated biochemical treatment system starting period, waste water progressively adds homogeneous unit by control sequence and flow, at the end of denitrification-nitrated biochemical treatment system starts, the water quality characteristic entering the homogeneous waste water of anoxic unit is:
Ammonia nitrogen concentration is 60 ~ 330mg/L,
COD concentration is 300 ~ 1500mg/L,
PH value between 6 ~ 9,
Homogeneous waste water has biodegradability, and biodegradability BOD and COD ratio represents, BOD and COD ratio >=0.3.
8. start the method for denitrification-nitrated biochemical treatment system as claimed in claim 7 fast, it is characterized in that:
Denitrification-between the nitrated biochemical treatment system starting period be points to biochemical unit and adds kind of a mud, little by little increases the waste strength entering biochemical unit or flow or kind, cultivates and tame, until it adapts to target waste strength and flow completely to kind of mud;
Denitrification-nitrated biochemical treatment system starts end and refers to that kind of mud can adapt to target waste strength and kind and flow completely, index be the waste strength entering homogeneous unit, flow and kind in target zone and denitrification-nitrated biochemical treatment system water outlet reach in target call situation and run more than 2 weeks continuously, and sludge concentration can maintain more than 1.5g/L.
9. start the method for denitrification-nitrated biochemical treatment system as claimed in claim 1 fast, it is characterized in that, concrete steps are:
Step 1, waste water introduces homogeneous unit: when having multiply intake, can introduce multiply in proportion and intake between the starting period, or first introduces easy biochemical waste water and introduce that concentration is higher, the poorer waste water of biochemical again according to the method in step 8 successively;
Step 2, denitrification-used kind of nitrated biochemical treatment system mud is added in anoxic unit and/or aerobic unit, the water in clear water or homogeneous unit is added in anoxic unit and aerobic unit, open aerobic unit Air supply facility and anoxic unit stirring facility, mud and water or waste water in anoxic unit and aerobic unit are mixed, makes always to reach 1 ~ 6g/L by filtration residue in pond;
Step 3, opens mixed-liquor return;
Step 4, outlet to homogeneous unit or anoxic unit or aerobic unit or aerobic unit is disposable to add containing ironic hydroxide or ferrous sulfate or ferric sulfate or iron(ic) chloride or containing the suspension liquid of the arbitrary above-mentioned substance of proportioning or liquid or solid or waste liquid or waste water, the add-on of ferro element be after adding ferro element in biochemical unit always can not filtration residue amount 1 ~ 31%;
Step 5, adds the material containing high-valence state nitrogen to homogeneous unit, makes the ratio of COD concentration and high-valence state nitrogen total concn in homogeneous unit structures be 1 ~ 6;
Stopping to the opportunity that homogeneous unit adds containing the material of high-valence state nitrogen is: in step 8 implementation process, in aerobic unit ammonia nitrogen concentration reduce or aerobic unit in the concentration of nitrate nitrogen higher than nitrate nitrogen in homogeneous unit and cultured water total concn time, or mud and muddy water mixed solution backflow itself are when can cause the ratio of COD concentration and high-valence state nitrogen total concn in homogeneous unit structures to be 1 ~ 6, or when cultured water concentration is higher than COD concentration in homogeneous unit, can stops or reducing the material added containing high-valence state nitrogen;
Step 6, the water outlet of homogeneous unit is introduced anoxic unit and controls flow, and the muddy water mixed solution of anoxic unit flows into aerobic unit, and the muddy water mixed solution inflow precipitation unit of aerobic unit, to covering sludge reflux tube inlet, namely opens sludge reflux;
Step 7, adjustment Air supply facility makes aerobic unit outlet dissolved oxygen concentration reach 2 ~ 7mg/L;
Step 8, continuum micromeehanics continuous effluent is run, the water outlet of monitoring precipitation unit, treat its COD index reach water outlet requirement 160% within and within ammonia nitrogen index reaches water outlet requirement 120%, increase the kind of waste water that enters homogeneous unit or improve 1.2 ~ 3 times that the flow of waste water of introducing homogeneous unit and concentration to the product of flow and concentration is original value, the mud of anoxic unit and aerobic unit is tamed;
Biochemical unit pH is adjusted in 6 ~ 9 scopes with alkaline matter in operation;
Adjusting Air supply facility in operation keeps aerobic unit outlet dissolved oxygen concentration to reach 2 ~ 7mg/L;
Step 9, enter the concentration of the waste water of homogeneous unit and flow and kind and reach target zone, precipitation unit water outlet reaches target call in continuous more than 2 weeks, and sludge concentration can maintain more than 1.5g/L, starts and terminates.
10. start the method for denitrification-nitrated biochemical treatment system as claimed in claim 9 fast, it is characterized in that: between the starting period, clear water or other lower concentration drainings can be added to homogeneous unit or anoxic unit or aerobic unit, reduce the initial COD concentration of biochemical unit to 2 times of its precipitation unit water outlet target value to 4 times, reduce ammonia nitrogen concentration to 2 times of its precipitation unit water outlet target value to 4 times.
11. methods starting denitrification-nitrated biochemical treatment system fast as claimed in claim 9, it is characterized in that: in order to eliminate the suppression of iron ion to denitrification and nitration reaction, except the iron compound added is except the situation of ironic hydroxide, interpolation with iron compound also adds alkaline matter simultaneously, and addition method is:
When adding iron compound to homogeneous unit, regulate to biochemical unit water inlet pH value to >=6.0 by adding alkaline matter to homogeneous unit,
When adding iron compound to the outlet of anoxic unit or aerobic unit or aerobic unit, keep biochemical unit pH value >=6.0 by adding alkaline matter to this unit or homogeneous unit.
12. methods starting as claimed in claim 9 denitrification-nitrated biochemical treatment system fast, is characterized in that: denitrification-used kind of nitrated biochemical treatment system mud is municipal sewage plant mud, industrial effluent treatment plant's mud, anaerobic reactor discharge one of any in mud or the mixture of two kinds and the arbitrary above-mentioned mud of above proportioning.
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