CN110117148A - A kind of the low temperature thermokalite digestion procedure and its reaction unit of sewage plant biochemical sludge - Google Patents
A kind of the low temperature thermokalite digestion procedure and its reaction unit of sewage plant biochemical sludge Download PDFInfo
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- CN110117148A CN110117148A CN201910440751.8A CN201910440751A CN110117148A CN 110117148 A CN110117148 A CN 110117148A CN 201910440751 A CN201910440751 A CN 201910440751A CN 110117148 A CN110117148 A CN 110117148A
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- alkali
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The present invention provides a kind of low temperature thermokalite digestion procedure of sewage plant biochemical sludge, and sludge liquid plus alkali are stirred and carry out low-temperature heat.The present invention further provides a kind of low temperature thermokalites of sewage plant biochemical sludge to clear up reaction unit, it include pond body, the input end of the pond body is equipped with mud inlet and adds alkali mouth, and the outlet end of the pond body is equipped with mud mouth, is equipped with heater, thermometer, pH meter and multiple blenders in the pond body.The low temperature thermokalite resolution reaction method and its reaction unit of a kind of sewage plant biochemical sludge provided by the invention, it is used in combination using low temperature pyrogenation and alkaline hydrolysis, both reaction temperature is reduced, the consumption of alkali is reduced again, the microbial cell body in sludge for generating biochemical processing procedure of sewage is cracked, sludge yield is reduced, the pressure of the further subsequent processing disposition of sludge is mitigated.
Description
Technical field
The invention belongs to technical field of sewage, be related to a kind of sewage plant biochemical sludge low temperature thermokalite digestion procedure and
Its reaction unit, and in particular to a kind of to react the biochemical sludge progress low temperature thermokalite resolution of sewage plant generation to reduce sludge
The method and device thereof of yield.
Background technique
It, generally can be using the organic pollutant in bioanalysis degradation sewage, in organic dirt of degrading in sewage treatment field
While contaminating object, microbial cell body is proliferated, on the one hand these microorganisms are that sewage treatment is made that contribution, on the other hand
The part of excessive proliferation will be discharged from biochemical treatment system, to generate a large amount of biological sludge.It is micro- contained by this sludge
There is a large amount of water intracellular in biological cell, moisture percentage in sewage sludge is still up to 60%~80% after mechanical dehydration, subsequent processing
Disposition needs to spend higher cost.
Currently, can be handled using high temperature pyrolysis technique sludge, i.e., at 150~200 DEG C and 0.5~0.8MPa
Under pressure condition, crack sludge microbe body, intracellular water and nutriment are released, the dehydration journey of sludge
Degree improves, and the moisture content after can making mechanical sludge dewatering is lower, so that making the yield of sludge reduces.But use high temperature pyrolysis work
Skill operation temperature is high, needs high temperature heat source, generally uses steam, can use industrial steam or is steamed using natural gas boiler manufacture
Vapour, cracking 1 ton of sludge (in terms of doing matter by sludge, similarly hereinafter) about needs 1.5 tons of steam, and run cost is higher, and reaction is at high temperature under high pressure
It carries out, reactor cost of manufacture is high, and it is high to operate level requirement to operations staff.
Sludge can also be handled using adding alkali to break born of the same parents' technique, i.e., add a high proportion of alkali, such as hydrogen in sludge
Sodium oxide molybdena or calcium oxide, such as cracking 1 ton of sludge about needs 200 kilograms of calcium oxide (quick lime) to crack microbial body, releases
Water and nutriment intracellular, equally can be improved the degree of dehydration of sludge, reduce sludge yield.Alkaline hydrolysis technique is in normal temperature and pressure
Lower progress, reaction condition is acceptant, but reaction speed is slower, and quantity of alkali consumption is big, and adding for alkali increases the dry of reaction product
Amount of substance.
In addition somebody's research cracks microbial cell body using technologies such as ozone oxidation, hydrogen peroxide oxidation, ultrasonic waves, makes
Mud decrement.But above-mentioned other microbial body breaking techniques costs are higher, do not have engineering application value still at present.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of pyrolysis under cryogenic with
Alkaline hydrolysis synergy cracks the microbial cell body in sewage plant sludge to reduce the method and device thereof of sludge yield.
In order to achieve the above objects and other related objects, first aspect present invention provides a kind of the low of sewage plant biochemical sludge
Alkali digestion procedure is warmed, sludge liquid plus alkali are stirred and carries out low-temperature heat.
The semisolid or solid matter that above-mentioned sewage plant biochemical sludge generates in the sewage disposal process of sewage plant.
Biochemical sludge be derived from sewage plant biochemistry pool processing sewage during microorganism growth, microorganism is with having in sewage
Machine pollutant is that nutrients proliferation is grown, and one side decomposing organic matter, another aspect micro organism quantity increases, and needs periodically from life
Change and exclude a part in pond, to keep the balance of microbial biomass, the microbial body of this part discharge is exactly the residue of sewage plant
Sludge.
Preferably, the moisture content of the sludge liquid is 95~99.5%.
Preferably, the alkali is combined selected from one or both of sodium hydroxide or calcium oxide.
Preferably, the sludge liquid adds the pH value after alkali to be 8~12.It is highly preferred that the sludge liquid adds the pH value after alkali
It is 9~11.
Preferably, the stirring rate that the sludge liquid adds alkali to stir is 10-100 revs/min.It is highly preferred that the sludge
The stirring rate that liquid adds alkali to stir is 20-80 revs/min.
Preferably, the mixing time that the sludge liquid adds alkali to stir is 1~6 hour.It is highly preferred that the sludge liquid adds alkali
The mixing time of stirring is 3~5 hours.
Preferably, the low-temperature heat is heated using heater, and the temperature of hot water is 60~90 DEG C in heater.More
Preferably, the temperature of hot water is 70~90 DEG C in the heater.
It is highly preferred that the flow of hot water is 3~10 times of sludge flow quantity in the heater.Most preferably, described to add
The flow of hot water is 5~8 times of sludge flow quantity in hot device.
It is highly preferred that hot water is the sewage plant output water of heat pump recycling in the heater.
Preferably, the temperature of the low-temperature heat of the sludge liquid is 60~80 DEG C.It is highly preferred that the low temperature of the sludge liquid
The temperature of heating is 70~80 DEG C.
Second aspect of the present invention provides a kind of low temperature thermokalite resolution reaction unit of sewage plant biochemical sludge, includes pond
Body, the input end of the pond body are equipped with mud inlet and add alkali mouth, and the outlet end of the pond body is equipped with mud mouth, sets in the pond body
Having heaters, thermometer, pH meter and multiple blenders.
Preferably, the interior edge of the pond body is successively arranged the first stirring area, heating zone, the second stirring area into mud direction, described
The input end of first stirring area is equipped with mud inlet and adds alkali mouth, is equipped with the first blender, the heating in first stirring area
It is equipped with heater, thermometer and pH meter in area, the outlet end of second stirring area is equipped with mud mouth, in second stirring area
Equipped with the second blender.
Preferably, the mud inlet is located at the side wall upper part of the pond body input end, and described plus alkali mouth is located at the pond body
The top of input end, the mud mouth are located at the lower sidewall of the pond body outlet end.
It is highly preferred that the mud inlet is located at the pond body side wall upper part where the input end of first stirring area, it is described to add
Alkali mouth is located at the pond body top where the input end of first stirring area, and the mud mouth is located at second stirring area outlet end
The pond body lower sidewall at place.
It is highly preferred that the heater is set to the pond body lower section where the heating zone, the thermometer and pH meter are set to
Above pond body where the heating zone.
Preferably, the heater is successively arranged hot water inlet and hot water outlet along hot water inflow direction.
As described above, the low temperature thermokalite digestion procedure and its reaction dress of a kind of sewage plant biochemical sludge provided by the invention
It sets, has the advantages that
(1) the low temperature thermokalite digestion procedure and its reaction unit of a kind of sewage plant biochemical sludge provided by the invention, can answer
For sewage treatment field, in the sludge for generating biochemical processing procedure of sewage using mode associated with low temperature pyrogenation and alkaline hydrolysis
Microbial cell body is cracked, and water and nutriment intracellular are discharged, so that sludge yield is reduced, after mitigation sludge is further
The pressure of continuous processing disposition.
(2) the low temperature thermokalite digestion procedure and its reaction unit of a kind of sewage plant biochemical sludge provided by the invention uses
Low-temperature heat, it is not necessary to which it is big to be heated using heat supplies such as industrial waste heat, sewage source heat pumps as heat source using high-temperature steam for cost
Amplitude reduction, reaction process is milder, easy to operate.
(3) the low temperature thermokalite digestion procedure and its reaction unit of a kind of sewage plant biochemical sludge provided by the invention uses
Low temperature pyrogenation is used in combination with alkaline hydrolysis, not only reduces reaction temperature, but also reduces the consumption of alkali.
Detailed description of the invention
Fig. 1 is shown as a kind of structural representation of the low temperature thermokalite resolution reaction unit of sewage plant biochemical sludge of the invention
Figure.
Appended drawing reference
1 pond body
11 first stirring areas
12 heating zones
13 second stirring areas
2 mud inlets
3 mud mouths
4 add alkali mouth
5 blenders
51 first blenders
52 second blenders
6 heaters
61 hot water inlets
62 hot water outlets
7 thermometers
8 pH meters
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily.
Please refer to Fig. 1.It should be clear that this specification structure depicted in this specification institute accompanying drawings, ratio, size etc., only to cooperate
The revealed content of specification is not intended to limit the invention enforceable so that those skilled in the art understands and reads
Qualifications, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size,
It does not influence still fall in disclosed technology contents under the effect of present invention can be generated and the purpose that can reach
It obtains in the range of capable of covering.Meanwhile cited such as "upper", "lower", "left", "right", " centre " and " one " in this specification
Term, be merely convenient to being illustrated for narration, rather than to limit the scope of the invention, the change of relativeness or
Adjustment, under the content of no substantial changes in technology, when being also considered as the enforceable scope of the present invention.
The present invention provides a kind of low temperature thermokalite digestion procedure of sewage plant biochemical sludge, and sludge liquid plus alkali are stirred and carried out
Low-temperature heat.
The semisolid or solid matter that above-mentioned sewage plant biochemical sludge generates in the sewage disposal process of sewage plant.
Biochemical sludge be derived from sewage plant biochemistry pool processing sewage during microorganism growth, microorganism is with having in sewage
Machine pollutant is that nutrients proliferation is grown, and one side decomposing organic matter, another aspect micro organism quantity increases, and needs periodically from life
Change and exclude a part in pond, to keep the balance of microbial biomass, the microbial body of this part discharge is exactly the residue of sewage plant
Sludge.
For biochemical sludge, for handling the sewage plant based on sanitary sewage, 10,000 tons of sewage of every processing are generated
About 1~2 ton of surplus sludge volume (in terms of doing matter by sludge), wherein than water, the microbial body in biochemical sludge accounts for about 40~
70%, part in addition is inorganic substances, such as silt particle etc..Microbial body mainly includes bacterium, protozoan and algae etc..From
The excess sludge being discharged in biochemistry pool is slurry condition, and moisture content is generally 99~99.5%, and concentrated rear moisture content can drop
It is in still flowable state, and volume is bigger, such as one ton of solid amount of sludge, moisture content are 95% to being 95~98%
If, gross mass is 20 tons, and 19 tons therein are water.The sludge of this form must further decrease its total amount could be into one
Step disposition utilizes, and on the one hand to reduce its moisture content, on the other hand can cut down to amount of solid therein, be exactly to wherein
The microbial cell body of Organic cut down.After sludge is further cut down and reduces moisture content, total amount is greatly lowered, example
Such as one ton of sludge of solid amount, if moisture content drops to 50%, gross mass is only 2 tons, and this sludge is solid shape
State is readily transported and disposes.It, can be further to mud decrement, such as solid if can cut down to the total solid of sludge
The sludge that one ton of total amount, Organic microbial cell body accounting 50% therein, cut down technology pair according to sludge by that is, 0.5 ton
This part organic principle abatement 40%, that is, cut down 0.2 ton, and total solid is reduced to 0.8 ton, if moisture content drops to 50%,
Gross mass is only 1.6 tons.
In a specific embodiment, the sludge liquid is the sludge containing microbial body that sewage plant generates, warp
Moisture content after concentration is 95~99.5%, for the flowable state similar to liquid.
In the low temperature thermokalite digestion procedure of sewage plant biochemical sludge provided by the present invention, the reaction is usually in alkaline item
It being carried out under part, the type and usage amount of suitable alkali can be selected in those skilled in the art, to adjust the pH value in staying water,
For example, it may be inorganic base, more specifically can be alkali metal hydroxide, alkaline earth metal hydroxide, alkali metal oxide or
Alkaline earth oxide etc., in a preferred embodiment of the invention, the alkali is selected from sodium hydroxide and/or calcium oxide；Example again
Such as, the usage amount of alkali generally depends on the pH value of reaction system, and in a preferred embodiment of the invention, the sludge liquid adds alkali
PH value afterwards is 8~12, and in preferable situation, the sludge liquid adds the pH value after alkali to be 9~11, and the pH value of reaction system can be with
By online pH meter real-time monitoring, to control caustic dosage.
In a preferred embodiment, the stirring rate that the sludge liquid adds alkali to stir is 10-100 revs/min.Compared with
In good situation, the stirring rate that the sludge liquid adds alkali to stir is 20-80 revs/min.Sludge liquid is stirred by blender
It mixes, so that reaction progress is uniform.
In a preferred embodiment, the mixing time that the sludge liquid adds alkali to stir is 1~6 hour.In preferable feelings
Under condition, the mixing time that the sludge liquid adds alkali to stir is 3~5 hours.
In a preferred embodiment, the low-temperature heat is heated using heater, the temperature of hot water in heater
Degree is 60~90 DEG C.In preferable situation, the temperature of hot water is 70~90 DEG C in the heater.The heater is conventional makes
Heater, commercially available acquisition.
Further, the flow of hot water is 3~10 times of sludge flow quantity in the heater.Specifically, described to add
The flow of hot water is 5~8 times of sludge flow quantity in hot device.
Further, the sewage plant output water that hot water recycles in the heater for heat pump.
In a preferred embodiment, the temperature of the low-temperature heat of the sludge liquid is 60~80 DEG C.In preferable situation
Under, the temperature of the low-temperature heat of the sludge liquid is 70~80 DEG C.The sludge liquid monitors sludge liquid by online thermometer
Temperature is to control the flow of hot water.
The low temperature in above-mentioned low-temperature heat be it is corresponding with the high temperature of high temperature pyrolysis, refer to the temperature such as 60~80 DEG C
Degree, such temperature are easier to obtain, it is not necessary to using high-temperature steam as heat source, using industrial waste heat, sewage source heat pump
Equal heat supplies, heating cost are greatly lowered, and reaction process is milder, easy to operate.
It is low under the conditions of pyrolysis efficiency higher temperatures under cryogenic conditions, it assists with alkaline hydrolysis, i.e. low temperature pyrogenation is combined with alkaline hydrolysis and made
With making up the efficiency of low temperature pyrogenation with alkaline hydrolysis effect, the sludge microbe body that greater efficiency equally may be implemented cracks effect.Heat
Solution is combined with alkaline hydrolysis, not only reduces reaction temperature, but also reduce the consumption of alkali.
As shown in Figure 1, the present invention further provides a kind of low temperature thermokalites of sewage plant biochemical sludge to clear up reaction unit, packet
Pond body is included, the input end of the pond body is equipped with mud inlet and adds alkali mouth, and the outlet end of the pond body is equipped with mud mouth, the pond
It is equipped with heater, thermometer, pH meter and multiple blenders in vivo.
In a preferred embodiment, as shown in Figure 1, the interior edge of the pond body is successively arranged the first stirring into mud direction
Area, heating zone, the second stirring area, the input end of first stirring area are equipped with mud inlet and add alkali mouth, first stirring area
It is inside equipped with the first blender, is equipped with heater, thermometer and pH meter in the heating zone, the outlet end of second stirring area is set
There is mud mouth, is equipped with the second blender in second stirring area.
In a preferred embodiment, as shown in Figure 1, the mud inlet is located on the side wall of the pond body input end
Portion, described plus alkali mouth are located at the top of the pond body input end, and the mud mouth is located at the lower sidewall of the pond body outlet end.
Specifically, as shown in Figure 1, the mud inlet is located on the pond body side wall where the input end of first stirring area
Portion, described plus alkali mouth are located at the pond body top where the input end of first stirring area, and the mud mouth is located at described second and stirs
Mix the pond body lower sidewall where area outlet end.The setting position of above-mentioned mud inlet and mud mouth, convenient for sludge in pond body
It advances.Above-mentioned plus alkali mouth setting position, convenient for adding alkali.
In a specific embodiment, as shown in Figure 1, the heater is under the pond body where the heating zone
Side, the thermometer and pH meter are set to the pond body top where the heating zone.In a preferred embodiment, such as Fig. 1 institute
Show, the heater is successively arranged hot water inlet and hot water outlet along hot water inflow direction.The heater passes through hot water flow
Heat is provided.
In a preferred embodiment, as shown in Figure 1, the temperature is calculated as online thermometer.So as to supervise in real time
Survey the temperature of sludge liquid in pond body.The online temperature is calculated as conventional use of online thermometer, commercially available acquisition.
In a preferred embodiment, as shown in Figure 1, the pH meter is online pH meter.So as to real-time monitoring pond
The pH value of internal sludge liquid is to control caustic dosage.The online pH meter is conventional use of online pH meter, can be purchased from the market
Buy acquisition.
It in a preferred embodiment, can be from market as shown in Figure 1, the blender is conventional use of blender
Upper purchase obtains.
In the specific implementation process, the sludge containing microbial body sewage plant generated, its concentrated rear moisture content are
95~99.5%, it is sludge liquid in the flowable state for being similar to liquid.Sludge liquid is using the sewage plant biochemical sludge in the present invention
Low temperature thermokalite resolution reaction unit is handled, and sludge liquid is flowed into pond body through mud inlet, while by adding alkali mouth that alkali is added,
Alkali is combined selected from one or both of sodium hydroxide or calcium oxide, and starting blender stir within 1~6 hour, preferably 3~
5 hours；Stirring rate is 10-100 revs/min, preferably 20-80 revs/min；Pass through the pH of sludge liquid in pH meter conditioning tank body
Value is 8~12, preferably 9~11.Meanwhile hot water is passed through into heater by hot water inlet, hot water temperature is 60~90 DEG C,
Preferably 70~90 DEG C；The intracorporal sludge liquid of heater heating bath, by the temperature of sludge liquid in thermometer monitoring pool body to
The flow of hot water is controlled, the flow of hot water is 3~10 times, preferably 5~8 times of sludge flow quantity in heater；Sludge liquid
Heating temperature is set in 60~80 DEG C, preferably 70~80 DEG C, and the hot water of exchanged heat is discharged by hot water outlet.Specific behaviour
When making, while the first blender being located in the first stirring area and the second blender in the second stirring area are opened, to dirt
Mud liquid is stirred, so that reaction progress is uniform.Heater, thermometer and pH meter are located in heating zone, can to pyrolysis with
Alkaline hydrolysis control effectively, and is generally pyrolyzed the synergy with alkaline hydrolysis, and the microbial cell body in sludge is cracked.
Embodiment 1
The biochemical sludge that sewage plant is generated, its concentrated rear moisture content is 97%, in the flowable state for being similar to liquid, is
Sludge liquid.Sludge liquid is handled using the low temperature thermokalite resolution reaction unit of the sewage plant biochemical sludge in the present invention, will be dirty
Mud liquid flows into pond body through mud inlet, while by adding alkali mouth that alkali is added, alkali is sodium hydroxide, and starting blender carries out 4 hours
Stirring, stirring rate are 60 revs/min, and the pH value by sludge liquid in pH meter conditioning tank body is 10, the dosage of sodium hydroxide
It is the 8% of sludge dry weight amount.Meanwhile hot water, the dirt that thermal water source's self-heating blowback is received are passed through into heater by hot water inlet
Water factory's output water, hot water temperature are 90 DEG C, and the intracorporal sludge liquid of heater heating bath passes through sludge liquid in thermometer monitoring pool body
Temperature to control the flow of hot water, the flow of hot water is 7 times of sludge flow quantity, the temperature setting of sludge liquid in heater
At 70 DEG C, the hot water of exchanged heat is discharged by hot water outlet.When specific operation, it while opening in the first stirring area
First blender and the second blender in the second stirring area, are stirred sludge liquid, so that reaction progress is uniform.
Heater, thermometer and pH meter are located in heating zone, can control effectively to pyrolysis with alkaline hydrolysis, generally through pyrolysis and alkaline hydrolysis
Synergy, the microbial cell body in sludge cracked.
Embodiment 2
The biochemical sludge that sewage plant is generated, its concentrated rear moisture content is 98%, in the flowable state for being similar to liquid, is
Sludge liquid.Sludge liquid is handled using the low temperature thermokalite resolution reaction unit of the sewage plant biochemical sludge in the present invention, will be dirty
Mud liquid flows into pond body through mud inlet, while by adding alkali mouth that alkali is added, alkali is calcium oxide, and starting blender stir within 3 hours
It mixes, stirring rate is 80 revs/min, and the pH value by sludge liquid in pH meter conditioning tank body is 11, and the dosage of calcium oxide is dirt
The 12% of mud dry weight amount.Meanwhile hot water, the sewage plant that thermal water source's self-heating blowback is received are passed through into heater by hot water inlet
Output water, hot water temperature are 80 DEG C, and the intracorporal sludge liquid of heater heating bath passes through the temperature of sludge liquid in thermometer monitoring pool body
Degree is to control the flow of hot water, the flow of hot water is 6 times of sludge flow quantity in heater, and the temperature of sludge liquid is set in 75
DEG C, the hot water of exchanged heat is discharged by hot water outlet.When specific operation, while first be located in the first stirring area is opened
Blender and the second blender in the second stirring area, are stirred sludge liquid, so that reaction progress is uniform.Heating
Device, thermometer and pH meter are located in heating zone, can control effectively to pyrolysis with alkaline hydrolysis, generally through being pyrolyzed the connection with alkaline hydrolysis
Cooperation is used, and the microbial cell body in sludge is cracked.
Embodiment 3
The biochemical sludge that sewage plant is generated, not concentrated, moisture content 99.2%, in the flowing for being similar to liquid
State is sludge liquid.Sludge liquid is handled using the low temperature thermokalite resolution reaction unit of the sewage plant biochemical sludge in the present invention,
Sludge liquid is flowed into pond body through mud inlet, while by adding alkali mouth that alkali is added, alkali is sodium hydroxide, starting blender carries out 5
Hour stirring, stirring rate are 40 revs/min, and the pH value by sludge liquid in pH meter conditioning tank body is 9, and sodium hydroxide adds
Amount is the 8% of sludge dry weight amount.Meanwhile hot water is passed through into heater by hot water inlet, what thermal water source's self-heating blowback was received
Sewage plant output water, hot water temperature are 75 DEG C, and the intracorporal sludge liquid of heater heating bath passes through sludge in thermometer monitoring pool body
The temperature of liquid is to control the flow of hot water, the flow of hot water is 8 times of sludge flow quantity in heater, and the temperature of sludge liquid is set
70 DEG C are scheduled on, the hot water of exchanged heat is discharged by hot water outlet.When specific operation, it while opening in the first stirring area
The first blender and the second blender in the second stirring area, sludge liquid is stirred so that reaction carry out it is equal
It is even.Heater, thermometer and pH meter are located in heating zone, can control effectively to pyrolysis with alkaline hydrolysis, generally through pyrolysis and
The synergy of alkaline hydrolysis, the microbial cell body in sludge are cracked.
Embodiment 4
Sludge after taking 10 tons of sewage plants concentrated respectively, moisture percentage in sewage sludge 97% are computed dry matter content therein
It is 0.3 ton, the processing of born of the same parents' method is broken using the treatment conditions for the treatment of conditions, existing high temperature pyrolytic cracking (HTP) in embodiment 1, existing plus alkali
Condition respectively cracks sludge.
By embodiment 1, treated that sludge detects, it is found that the cell body in sludge has been cracked, organic substance obtains
It to release, is converted with pressing mud cake yield and moisture content of the cake after filter press filters pressing, sludge cut rate reaches 20%, and existing
High temperature pyrolytic cracking (HTP) is suitable to the cut rate of sludge, and abatement effect is obvious.Meanwhile the moisture percentage in sewage sludge after squeezing is 60%, hence it is evident that
It reduces.Above-mentioned sludge cut rate, which refers to, carries out dewatering press to sludge using after certain abatement technical treatment, to producing after squeezing
Raw mud cake is measured and surveys its moisture content to calculating its sludge total amount, compared with the sludge total amount before abatement after obtain
Ratio.
Meanwhile sludge is handled using existing high temperature pyrolytic cracking (HTP), sludge liquid is pumped into autoclave first, is stirred using blender
It mixes, the heating coil outside kettle is passed through steam heating, and the amount of steam is controlled by the temperature sensor in kettle, makes sludge liquid in kettle
Temperature is increased to 150 DEG C and keeps this temperature, at this moment the pressure of kettle about 0.5MPag.After reaction 30 minutes, the switch of reaction kettle
Valve is opened, and sludge liquid is injected into flash tank, then enters heat exchanger from flash tank, and heat exchange is cooled to 50 DEG C, carries out press dewatering,
Sludge cut rate is 25%.Meanwhile the moisture percentage in sewage sludge after squeezing is 60%.Existing high temperature pyrolytic cracking (HTP) handles sludge, needs to consume
0.45 ton of steam, based on 1 ton 200 yuan of steam market price, cost accounting RMB90.
Born of the same parents' method is broken using existing plus alkali and handles sludge, sludge liquid is pumped into Basic fluxing raction pond first, is stirred using blender, pressed
According to the quick lime that 20% investment of sludge dry mass needs, it is stirred to react 2 hours, carries out press dewatering, sludge cut rate is about
0%., the moisture percentage in sewage sludge after squeezing is 60%.Existing plus alkali breaks born of the same parents' method and handles sludge, need to consume alkali such as calcium oxide (quick lime)
90 kilograms, based on 1 kilogram 0.8 yuan of market price of calcium oxide (quick lime), cost accounting RMB72.
And sludge is handled using treatment conditions in embodiment 1 in the present invention, due to low temperature pyrogenation, using hot water heating, heat
The sewage plant output water that water source self-heating blowback is received, the temperature of hot water are 90 DEG C, and sludge liquid feeding temperature is 20 DEG C, are heated to 70
DEG C, the hot water amount needed is 70 tons.Only need to consume certain electric energy using the heat of the sewage plant output water of heat pump recycling, this
The electric energy consumed in embodiment is 30kWh, cost accounting RMB20.
Alkaline hydrolysis is carried out simultaneously, alkali such as 45 kilograms of calcium oxide (quick lime) is consumed, by 1 kilogram of calcium oxide (quick lime) market price
0.8 yuan of meter, cost accounting RMB36, total costing RMB56.Above-mentioned cost accounting data are shown in Table 1.As shown in Table 1, originally
The low temperature thermokalite digestion procedure used in invention, processing cost breaks born of the same parents' method significantly lower than existing high temperature pyrolytic cracking (HTP) plus alkali, at low cost
It is honest and clean.
Table 1
By data comparison in table 1 it is found that the mode for taking mechanical expression to be dehydrated again after three kinds of method conditionings can make sludge
Moisture content is reduced to 60%.Wherein high temperature pyrolytic cracking (HTP) is to the cut rate highest of sludge, but cost also highest；And alkali is added to break born of the same parents' method pair
Sludge is substantially without consumption；Method of the invention is the compromise algorithm of above two method, both reduces sludge conditioning
Cost, and have higher cut rate to sludge, it is worthy of popularization.
In conclusion the low temperature thermokalite digestion procedure and its reaction dress of a kind of sewage plant biochemical sludge provided by the invention
It sets, is used in combination using low temperature pyrogenation and alkaline hydrolysis, not only reduce reaction temperature, but also reduce the consumption of alkali, make at biochemical sewage
The microbial cell body in sludge that reason process generates is cracked, and sludge yield is reduced, and mitigates sludge further subsequent place
Manage the pressure of disposition.So the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (10)
1. sludge liquid plus alkali are stirred and carry out low-temperature heat, institute by a kind of low temperature thermokalite digestion procedure of sewage plant biochemical sludge
The temperature for stating the low-temperature heat of sludge liquid is 60~80 DEG C.
2. a kind of low temperature thermokalite digestion procedure of sewage plant biochemical sludge according to claim 1, which is characterized in that described
Alkali is combined selected from one or both of sodium hydroxide or calcium oxide.
3. a kind of low temperature thermokalite digestion procedure of sewage plant biochemical sludge according to claim 1, which is characterized in that described
Sludge liquid adds the pH value after alkali to be 8~12.
4. a kind of low temperature thermokalite digestion procedure of sewage plant biochemical sludge according to claim 1, which is characterized in that described
The stirring rate that sludge liquid adds alkali to stir is 10-100 revs/min.
5. a kind of low temperature thermokalite digestion procedure of sewage plant biochemical sludge according to claim 1, which is characterized in that described
The mixing time that sludge liquid adds alkali to stir is 1~6 hour.
6. a kind of low temperature thermokalite digestion procedure of sewage plant biochemical sludge according to claim 1, which is characterized in that described
Low-temperature heat is heated using heater, and the temperature of hot water is 60~90 DEG C in heater.
7. a kind of low temperature thermokalite digestion procedure of sewage plant biochemical sludge according to claim 6, which is characterized in that described
The flow of hot water is 3~10 times of sludge flow quantity in heater.
8. a kind of low temperature thermokalite of sewage plant biochemical sludge clears up reaction unit, which is characterized in that it include pond body (1), it is described
The input end of pond body (1) is equipped with mud inlet (2) and adds alkali mouth (4), and the outlet end of the pond body (1) is equipped with mud mouth (3), described
Heater (6), thermometer (7), pH meter (8) and multiple blenders (5) are equipped in pond body (1).
9. a kind of low temperature thermokalite of sewage plant biochemical sludge according to claim 8 clears up reaction unit, which is characterized in that
Edge is successively arranged the first stirring area (11), heating zone (12), the second stirring area (13) into mud direction in the pond body (1), described
The input end of first stirring area (11) is equipped with mud inlet (2) and adds alkali mouth (4), and first is equipped in first stirring area (11) and is stirred
It mixes device (51), heater (6), thermometer (7) and pH meter (8), second stirring area (13) is equipped in the heating zone (12)
Outlet end be equipped with mud mouth (3), be equipped with the second blender (52) in second stirring area (13).
10. a kind of low temperature thermokalite of sewage plant biochemical sludge according to claim 8 clears up reaction unit, feature exists
In the heater (6) is successively arranged hot water inlet (61) and hot water outlet (62) along hot water inflow direction.
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