CN110316929A - A kind of biochemical sludge internal carbon source utilizes method - Google Patents
A kind of biochemical sludge internal carbon source utilizes method Download PDFInfo
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- CN110316929A CN110316929A CN201910655103.4A CN201910655103A CN110316929A CN 110316929 A CN110316929 A CN 110316929A CN 201910655103 A CN201910655103 A CN 201910655103A CN 110316929 A CN110316929 A CN 110316929A
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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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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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
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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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C11/00—Other nitrogenous fertilisers
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
Abstract
The invention discloses a kind of biochemical sludge internal carbon sources to utilize method, is related to technical field of sludge treatment, mainly for solving the problems, such as existing method bring overproof water quality, influencing sludge activity；Steps are as follows: 1) sewage plant biochemical sludge carries out pyrohydrolysis processing；2) sludge hot hydrolysate is handled water outlet with sewage treatment plant and mixed, magnesium chloride is added in mixed liquor and is reacted, then mixed liquor is precipitated by biochemical sludge after pyrohydrolysis is handled；3) by after precipitating base sludge residue carry out plate compression dehydration, 4) by after precipitating upper liquid sand filtration handle, then carry out nanofiltration membrane separation；The application successively washes biochemical sludge pyrohydrolysis product, the reaction of magnesium chloride medicament, precipitation and separation, sand filtration processing and nanofiltration membrane separation, in separation removal pyrohydrolysis product major part is nitrogenous, phosphorus-containing compound and inert impurities, treated, and pyrohydrolysis product can be used as carbon source is back to sewage plant biochemical treatment system.
Description
Technical field
The present invention relates to technical field of sludge treatment, specifically a kind of biochemical sludge internal carbon source utilizes method.
Background technique
Generally existing entering organic matter of water concentration is relatively low at present for China's most cities sanitary sewage, trade effluent, carbon-nitrogen ratio
It is worth relatively low problem, so that carbon source needed for biological denitrification denitrogenation is insufficient, causes processing water outlet total nitrogen to be difficult to up to standard.Often need
The external carbon sources such as glucose, sodium acetate are added, to maintain carbon source needed for denitrification denitrogenation, this both increases sewage treatment drug
It expends, and increases sewage plant excess sludge yield.In addition, due to generating a large amount of excess sludges in biochemical processing procedure of sewage,
As can releasing the organic matter in sludge by carrying out processing to biochemical sludge, and using the organic matter released as dirt
Carbon source needed for water process denitrification denitrogenation can then save the consuming of additional carbon needed for sewage treatment, and can make biochemistry
Recycling sludge reduces sewage plant overall operation cost.
Pyrohydrolysis is a kind of biochemical sludge lysis broken wall treatment technology.The technology using high temperature, high pressure to biochemical sludge into
Row pyrohydrolysis and flash distillation process hydrolyze extracellular polymeric and larger molecular organics in biochemical sludge, and destroy sludge
The cell wall of middle microorganism hydrolyzes the carbohydrate in extracellular microbial, protein and fat, is converted into carbohydrate, ammonia
The easily biological-degradables organic matter such as base acid and fatty acid, carbon source needed for which can be used as sewage treatment denitrification denitrogenation.But
Due in pyrohydrolysis product, other than the easily biological-degradable substance being converted into, also containing nitrogen, phosphorus compound and insoluble lazy
Property impurity；Pyrohydrolysis product is directly such as back to raw sewage processing system without processing, on the one hand will cause sewage treatment
Nitrogen, phosphorus load increase, and keep sewage effluents water quality exceeded, and it is tired in biochemical system on the other hand to will cause inert impurities
Product, influences sludge activity.
Summary of the invention
The purpose of the present invention is to provide a kind of biochemical sludge internal carbon sources to utilize method,.
To achieve the above object, the invention provides the following technical scheme:
A kind of biochemical sludge internal carbon source utilizes method, and steps are as follows:
1) after the concentrated dehydration with conventional mechanical of sewage plant biochemical sludge, moisture content 80-85% is carried out pyrohydrolysis
Processing；
2) sludge hot hydrolysate is handled water outlet with sewage treatment plant and mixed by biochemical sludge after pyrohydrolysis is handled
It closes, then adds magnesium chloride in mixed liquor and reacted, then mixed liquor is precipitated；
3) the base sludge residue after precipitating is subjected to plate compression dehydration；
4) upper liquid after precipitating is first subjected to sand filtration processing, removes the graininess impurity in liquid；Then it is received
Filter membrane separating treatment；Organic matter in liquid is retained by nanofiltration membrane, and obtained nanofiltration retentate fluid reflux is used as at sewage plant biochemistry
Carbon source needed for reason system denitrification, ammonium ion, chloride ion in liquid penetrate nanofiltration membrane, are enriched ammonia nitrogen in permeate, into
Nitrogenous fertilizer is made in one step.
Based on the above technical solution, the present invention also provides following optional technical solutions:
In a kind of optinal plan: the technological parameter of sludge pyrohydrolysis process described in step 1) is as follows: pyrohydrolysis temperature
It is 160-180 DEG C, hot water decompression force is 0.55-0.6MPa, pyrohydrolysis reaction time 30min.
In a kind of optinal plan: sludge hot hydrolysate and the volume ratio of sewage plant processing water outlet are 1:5- in step 2)
10。
In a kind of optinal plan: it is 30min that the reaction time is mixed in step 2).
In a kind of optinal plan: magnesium chloride adds 4-4.5 times that concentration is phosphorus mass concentration in mixed liquor in step 2),
Being stirred to react the time is 30min.
In a kind of optinal plan: the sedimentation time is 2-3h in step 2).
In a kind of optinal plan: it is 55-60% that filter-press dehydration, which obtains the moisture content of mud cake, in step 4).
Compared to the prior art, beneficial effects of the present invention are as follows:
(1) in pyrohydrolysis process, the cell wall of microorganism is destroyed in biochemical sludge, the carbon aquation in microbial cell
It closes object, protein and fat to hydrolyze, is converted into the solubility such as carbohydrate, amino acid and fatty acid or microsolubility substance；
(2) in mixing water-washing process, the solubility or microsolubility substance that sludge hot hydrolysis generates are shifted through dilution
Into water lotion；
(3) in medicament reaction process, the magnesium chloride that adds and the nitrogenous, phosphorus-containing compound in sludge hot hydrolysate are anti-
It answers, generates magnesium ammonium phosphate sediment；
(4) during precipitation and separation, the insoluble inert residues in sludge hot hydrolysate are removed by separation, meanwhile,
Major part in sludge hot hydrolysate is nitrogenous and phosphorus-containing compound is removed by forming magnesium ammonium phosphate sediment；Sludge pyrohydrolysis
The easily biological-degradable organic matter of solubility or microsolubility in product is back at sewage plant biochemistry in sedimentation basin upper liquid
Reason system not only may be used as carbon source needed for denitrification denitrogenation, but also not will increase sewage plant nitrogen, phosphorus processing load；
(5) since the base sludge residue inanimate matter content after precipitation and separation is high, mixed liquor volatile suspended solid, MLVSS concentration
Ratio with mixed genetic-neural network is 30-40%；Therefore the dewatering of the sludge residue is good, is dehydrated through plate compression
The moisture content of the cake obtained afterwards is low compared to the moisture content of routine biochemistry sludge dewatering mud cake, is 55-60%；
(6) soluble easily biological-degradable organic matter, the Yi Jiwei generated in sedimentation basin upper liquid containing sludge pyrohydrolysis
The nitrogenous compound of precipitating is formed with phosphorus-containing compound, the principal mode of the nitrogenous compound is ammonium ion, will be on sedimentation basin
Portion's liquid first handles removal graininess impurity through sand filtration, then carries out nanofiltration membrane retention separating treatment；Monovalent ion (ammonium root in water
Ion and chloride ion etc.) it can pass through nanofiltration membrane, and the organic matter in water is then retained by nanofiltration membrane, i.e., is handled by nanofiltration by liquid
In organic matter and ammonia nitrogen realize separation；
(7) after nanofiltration membrane treatment, have in obtained trapped fluid rich in easily biological-degradables such as carbohydrate, amino acid and fatty acid
Machine object, it is reflowable not only to have may be used as carbon source needed for denitrification denitrogenation to sewage plant biochemical treatment system, but also not will increase sewage plant
Nitrogen, phosphorus handle load；And ammonia nitrogen is enriched in nanofiltration permeate liquid, nitrogenous fertilizer can further be made.
Specific embodiment
Following embodiment can be described in detail the present invention, and each embodiment cited by the present invention is only to illustrate the present invention,
It is not used to limit the scope of the present invention.Any modification apparent easy to know or change made for the present invention are without departure from the present invention
Spirit and scope.
Embodiment 1
In the embodiment of the present invention, a kind of biochemical sludge internal carbon source utilizes method, and steps are as follows:
1) after the concentrated dehydration with conventional mechanical of sewage plant biochemical sludge, moisture content 80% is carried out at pyrohydrolysis
Reason；
2) sludge hot hydrolysate is handled water outlet with sewage treatment plant and mixed by biochemical sludge after pyrohydrolysis is handled
It closes, then adds magnesium chloride in mixed liquor and reacted, then mixed liquor is precipitated；
3) the base sludge residue after precipitating is subjected to plate compression dehydration；
4) upper liquid after precipitating is first subjected to sand filtration processing, removes the graininess impurity in liquid；Then it is received
Filter membrane separating treatment；Organic matter in liquid is retained by nanofiltration membrane, and carbohydrate, amino acid and rouge are rich in obtained nanofiltration retentate fluid
The easily biological-degradables organic matter such as fat acid, flow back carbon source needed for being used as sewage plant biochemical treatment system denitrification, the ammonium root in liquid
The monovalent ions such as ion, chloride ion penetrate nanofiltration membrane, are enriched ammonia nitrogen in permeate, nitrogenous fertilizer is further made.
Wherein, the technological parameter of sludge pyrohydrolysis process described in step 1) is as follows: pyrohydrolysis temperature is 160 DEG C, hot water
Decompression force is 0.55MPa, pyrohydrolysis reaction time 30min.
Sludge hot hydrolysate and the volume ratio of sewage plant processing water outlet are 1:5 in step 2).
It is 30min that the reaction time is mixed in step 2).
Magnesium chloride adds 4- times that concentration is phosphorus mass concentration in mixed liquor in step 2), and being stirred to react the time is 30min.
The sedimentation time is 2h in step 2).
It is 55% that filter-press dehydration, which obtains the moisture content of mud cake, in step 4).
Embodiment 2
In the embodiment of the present invention, a kind of biochemical sludge internal carbon source utilizes method, and steps are as follows:
1) after the concentrated dehydration with conventional mechanical of sewage plant biochemical sludge, moisture content 81% is carried out at pyrohydrolysis
Reason；
2) sludge hot hydrolysate is handled water outlet with sewage treatment plant and mixed by biochemical sludge after pyrohydrolysis is handled
It closes, then adds magnesium chloride in mixed liquor and reacted, then mixed liquor is precipitated；
3) the base sludge residue after precipitating is subjected to plate compression dehydration；
4) upper liquid after precipitating is first subjected to sand filtration processing, removes the graininess impurity in liquid；Then it is received
Filter membrane separating treatment；Organic matter in liquid is retained by nanofiltration membrane, and carbohydrate, amino acid and rouge are rich in obtained nanofiltration retentate fluid
The easily biological-degradables organic matter such as fat acid, flow back carbon source needed for being used as sewage plant biochemical treatment system denitrification, the ammonium root in liquid
The monovalent ions such as ion, chloride ion penetrate nanofiltration membrane, are enriched ammonia nitrogen in permeate, nitrogenous fertilizer is further made.
Wherein, the technological parameter of sludge pyrohydrolysis process described in step 1) is as follows: pyrohydrolysis temperature is 165 DEG C, hot water
Decompression force is 0.56MPa, pyrohydrolysis reaction time 30min.
Sludge hot hydrolysate and the volume ratio of sewage plant processing water outlet are 1:6 in step 2).
It is 30min that the reaction time is mixed in step 2).
Magnesium chloride, which adds concentration and is 4.1 times of phosphorus mass concentration in mixed liquor, in step 2) is stirred to react the time and is
30min。
The sedimentation time is 2h in step 2).
It is 56% that filter-press dehydration, which obtains the moisture content of mud cake, in step 4).
Embodiment 3
In the embodiment of the present invention, a kind of biochemical sludge internal carbon source utilizes method, and steps are as follows:
1) after the concentrated dehydration with conventional mechanical of sewage plant biochemical sludge, moisture content 82% is carried out at pyrohydrolysis
Reason；
2) sludge hot hydrolysate is handled water outlet with sewage treatment plant and mixed by biochemical sludge after pyrohydrolysis is handled
It closes, then adds magnesium chloride in mixed liquor and reacted, then mixed liquor is precipitated；
3) the base sludge residue after precipitating is subjected to plate compression dehydration；
4) upper liquid after precipitating is first subjected to sand filtration processing, removes the graininess impurity in liquid；Then it is received
Filter membrane separating treatment；Organic matter in liquid is retained by nanofiltration membrane, and carbohydrate, amino acid and rouge are rich in obtained nanofiltration retentate fluid
The easily biological-degradables organic matter such as fat acid, flow back carbon source needed for being used as sewage plant biochemical treatment system denitrification, the ammonium root in liquid
The monovalent ions such as ion, chloride ion penetrate nanofiltration membrane, are enriched ammonia nitrogen in permeate, nitrogenous fertilizer is further made.
Wherein, the technological parameter of sludge pyrohydrolysis process described in step 1) is as follows: pyrohydrolysis temperature is 170 DEG C, hot water
Decompression force is 0.58MPa, pyrohydrolysis reaction time 30min.
Sludge hot hydrolysate and the volume ratio of sewage plant processing water outlet are 1:8 in step 2).
It is 30min that the reaction time is mixed in step 2).
Magnesium chloride, which adds concentration and is 4.3 times of phosphorus mass concentration in mixed liquor, in step 2) is stirred to react the time and is
30min。
The sedimentation time is 2.5h in step 2).
It is 58% that filter-press dehydration, which obtains the moisture content of mud cake, in step 4).
Embodiment 4
In the embodiment of the present invention, a kind of biochemical sludge internal carbon source utilizes method, and steps are as follows:
1) after the concentrated dehydration with conventional mechanical of sewage plant biochemical sludge, moisture content 84% is carried out at pyrohydrolysis
Reason；
2) sludge hot hydrolysate is handled water outlet with sewage treatment plant and mixed by biochemical sludge after pyrohydrolysis is handled
It closes, then adds magnesium chloride in mixed liquor and reacted, then mixed liquor is precipitated；
3) the base sludge residue after precipitating is subjected to plate compression dehydration；
4) upper liquid after precipitating is first subjected to sand filtration processing, removes the graininess impurity in liquid；Then it is received
Filter membrane separating treatment；Organic matter in liquid is retained by nanofiltration membrane, and carbohydrate, amino acid and rouge are rich in obtained nanofiltration retentate fluid
The easily biological-degradables organic matter such as fat acid, flow back carbon source needed for being used as sewage plant biochemical treatment system denitrification, the ammonium root in liquid
The monovalent ions such as ion, chloride ion penetrate nanofiltration membrane, are enriched ammonia nitrogen in permeate, nitrogenous fertilizer is further made.
Wherein, the technological parameter of sludge pyrohydrolysis process described in step 1) is as follows: pyrohydrolysis temperature is 175 DEG C, hot water
Decompression force is 0.59MPa, pyrohydrolysis reaction time 30min.
Sludge hot hydrolysate and the volume ratio of sewage plant processing water outlet are 1:9 in step 2).
It is 30min that the reaction time is mixed in step 2).
Magnesium chloride, which adds concentration and is 4.5 times of phosphorus mass concentration in mixed liquor, in step 2) is stirred to react the time and is
30min。
The sedimentation time is 3h in step 2).
It is 58% that filter-press dehydration, which obtains the moisture content of mud cake, in step 4).
Embodiment 5
In the embodiment of the present invention, a kind of biochemical sludge internal carbon source utilizes method, and steps are as follows:
1) after the concentrated dehydration with conventional mechanical of sewage plant biochemical sludge, moisture content 85% is carried out at pyrohydrolysis
Reason；
2) sludge hot hydrolysate is handled water outlet with sewage treatment plant and mixed by biochemical sludge after pyrohydrolysis is handled
It closes, then adds magnesium chloride in mixed liquor and reacted, then mixed liquor is precipitated；
3) the base sludge residue after precipitating is subjected to plate compression dehydration；
4) upper liquid after precipitating is first subjected to sand filtration processing, removes the graininess impurity in liquid；Then it is received
Filter membrane separating treatment；Organic matter in liquid is retained by nanofiltration membrane, and carbohydrate, amino acid and rouge are rich in obtained nanofiltration retentate fluid
The easily biological-degradables organic matter such as fat acid, flow back carbon source needed for being used as sewage plant biochemical treatment system denitrification, the ammonium root in liquid
The monovalent ions such as ion, chloride ion penetrate nanofiltration membrane, are enriched ammonia nitrogen in permeate, nitrogenous fertilizer is further made.
Wherein, the technological parameter of sludge pyrohydrolysis process described in step 1) is as follows: pyrohydrolysis temperature is 180 DEG C, hot water
Decompression force is 0.6MPa, pyrohydrolysis reaction time 30min.
Sludge hot hydrolysate and the volume ratio of sewage plant processing water outlet are 1:10 in step 2).
It is 30min that the reaction time is mixed in step 2).
Magnesium chloride, which adds concentration and is 4.5 times of phosphorus mass concentration in mixed liquor, in step 2) is stirred to react the time and is
30min。
The sedimentation time is 3h in step 2).
It is 60% that filter-press dehydration, which obtains the moisture content of mud cake, in step 4).
Internal carbon source utilization is carried out to certain city sewage plant biochemical sludge using the technology of the present invention, technological parameter is as follows:
(1) after the industrial park sewage plant biochemical sludge is concentrated and centrifugal dehydration treatment, moisture content of the cake 80-
85%.
(2) by sludge carry out pyrohydrolysis processing, 160 DEG C of pyrohydrolysis reaction temperature, pyrohydrolysis reaction pressure 0.6MPa, hot water
Solve reaction time 30min.The sludge quality of pyrohydrolysis before and after the processing is as shown in the table；
As it can be seen that sludge, after pyrohydrolysis is handled, the indexs such as dissolubility COD, nitrogen, phosphorus are sharply increased, and dissolubility is volatilized
The ratio of property fatty acid and dissolubility COD is sharply increased, it is meant that the ingredient of organic matter is mostly easy biology in pyrohydrolysis product
The volatile fatty acid of degradation.
| Unit | Raw sludge | Pyrohydrolysis product | |
| Moisture percentage in sewage sludge | 81.8% | 83.2% | |
| Dissolubility COD | mg/L | 83 | 64200 |
| Dissolubility total nitrogen | mg/L | 12 | 3300 |
| Dissolubility total phosphorus | mg/L | 0.82 | 459 |
| Dissolubility volatile fatty acid/dissolubility COD | 0.87% | 62.3% |
(3) sludge hot hydrolysate is handled water outlet with sewage treatment plant to mix, the two volume ratio is 1:7, mixing
Being stirred to react the time is 30min.Then it adds magnesium chloride in mixed liquor to be reacted, it is in mixed liquor that magnesium chloride, which adds concentration,
4.5 times of phosphorus mass concentration, being stirred to react the time is 30min.Mixed liquor is precipitated again, sedimentation time 2-3h；Precipitating
Supernatant carries out nanofiltration membrane treatment after sand filtration is handled, and the nanofiltration rate of recovery is 50-75%；
Sludge hot hydrolysate is received after washing, medicament reaction, precipitation and separation, sand filtration processing and nanofiltration membrane separation
The property for filtering trapped fluid is as shown in the table, it is seen then that after using process proposed by the present invention, in sludge hot hydrolysate
Nitrogen, phosphorus are largely removed, and obtained aqueous wash liquid is rich in high concentration easily biological-degradable organic matter, be can be used as carbon source and are back to dirt
The processing of water factory's biochemical system.
(4) nanofiltration retentate fluid is back to the processing of sewage plant biochemical system, the base sludge residue after precipitating is subjected to plate
The processing of frame filter-press dehydration, the moisture content that filter-press dehydration obtains mud cake is 57.6%.
Biochemical sludge pyrohydrolysis product is not back to raw sewage processing system directly by the present invention, but by biochemical sludge
Pyrohydrolysis product successively washed, the reaction of magnesium chloride medicament, precipitation and separation, sand filtration processing and nanofiltration membrane separation, separation
Remove in pyrohydrolysis product major part is nitrogenous, phosphorus-containing compound and inert impurities, treated, and pyrohydrolysis product can be used as
Carbon source is back to sewage plant biochemical treatment system.
The above, the only specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, it is any
Those familiar with the art can easily think of the change or the replacement in the technical scope that the disclosure discloses, and should all contain
It covers within the protection scope of the disclosure.Therefore, the protection scope of the disclosure should be subject to the protection scope in claims.
Claims (7)
1. a kind of biochemical sludge internal carbon source utilizes method, which is characterized in that steps are as follows:
1) after the concentrated dehydration with conventional mechanical of sewage plant biochemical sludge, moisture content 80-85% is carried out pyrohydrolysis processing；
2) sludge hot hydrolysate is handled water outlet with sewage treatment plant and mixed, so by biochemical sludge after pyrohydrolysis is handled
Magnesium chloride is added in mixed liquor afterwards to be reacted, then mixed liquor is precipitated；
3) the base sludge residue after precipitating is subjected to plate compression dehydration；
4) upper liquid after precipitating is first subjected to sand filtration processing, removes the graininess impurity in liquid；Then nanofiltration membrane is carried out
Separating treatment；Organic matter in liquid is retained by nanofiltration membrane, and obtained nanofiltration retentate fluid reflux is used as sewage plant biochemical treatment system
It unites carbon source needed for denitrification, ammonium ion, chloride ion in liquid penetrate nanofiltration membrane, be enriched ammonia nitrogen in permeate, further
Nitrogenous fertilizer is made.
2. biochemical sludge internal carbon source according to claim 1 utilizes method, which is characterized in that sludge hot described in step 1)
The technological parameter of hydrolytic process is as follows: pyrohydrolysis temperature is 160-180 DEG C, and hot water decompression force is 0.55-0.6MPa, and pyrohydrolysis is anti-
30min between seasonable.
3. biochemical sludge internal carbon source according to claim 1 or 2 utilizes method, which is characterized in that sludge hot in step 2
Hydrolysate and the volume ratio of sewage plant processing water outlet are 1:5-10.
4. biochemical sludge internal carbon source according to claim 3 utilizes method, which is characterized in that be mixed in step 2 anti-
It is 30min between seasonable.
5. biochemical sludge internal carbon source according to claim 4 utilizes method, which is characterized in that magnesium chloride adds in step 2
Concentration is 4-4.5 times of phosphorus mass concentration in mixed liquor, and being stirred to react the time is 30min.
6. biochemical sludge internal carbon source according to claim 1 utilizes method, which is characterized in that the sedimentation time is in step 2
2-3h。
7. biochemical sludge internal carbon source according to claim 1 utilizes method, which is characterized in that filter-press dehydration obtains in step 4)
Moisture content to mud cake is 55-60%.
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| CN113213671A (en) * | 2021-06-09 | 2021-08-06 | 东珠生态环保股份有限公司 | Desilting method for silt mixed water body |
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