CN106755141A - The method that pyrohydrolysis joint high temperature anaerobic acidifying improves acidogenesis of waste activated sludge amount - Google Patents
The method that pyrohydrolysis joint high temperature anaerobic acidifying improves acidogenesis of waste activated sludge amount Download PDFInfo
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- CN106755141A CN106755141A CN201611190063.3A CN201611190063A CN106755141A CN 106755141 A CN106755141 A CN 106755141A CN 201611190063 A CN201611190063 A CN 201611190063A CN 106755141 A CN106755141 A CN 106755141A
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- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/40—Preparation of oxygen-containing organic compounds containing a carboxyl group including Peroxycarboxylic acids
- C12P7/54—Acetic acid
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- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/40—Preparation of oxygen-containing organic compounds containing a carboxyl group including Peroxycarboxylic acids
- C12P7/52—Propionic acid; Butyric acids
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- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/62—Carboxylic acid esters
- C12P7/625—Polyesters of hydroxy carboxylic acids
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Abstract
The present invention relates to a kind of high temperature acidified method for improving acidogenesis of waste activated sludge amount of pyrohydrolysis joint, belong to specific resistance to filtration and resource technology field.The present invention uses HTHP pyrohydrolysis and high temperature anaerobic acidification technique, and by the release dissolving of sludge protein, organic matter in effectively improving sludge after the treatment of HTHP pyrohydrolysis, it is high temperature acidified there is provided abundant solvent borne organic matter to be that sludge is subsequently carried out.High temperature anaerobic acidifying can form some distinctive breaks down proteins Pseudomonas, the degradation efficiency of larger molecular organicses in further raising system.Therefore, the method that the present invention is acidified Combined Treatment excess sludge using HTHP pyrohydrolysis and high temperature anaerobic, can effectively improve excess sludge hydrolysis efficiency and realize the maximization of small molecular organic acid yield.
Description
Technical field
The present invention relates to a kind of specific resistance to filtration and resource technology field, specifically a kind of HTHP hot water is de-connected
Close the method that anaerobic acidification improves acidogenesis of waste activated sludge amount.
Background technology
With the fast development of sewage disposal, the sludge of China produces total amount to increase rapidly in recent years.The whole nation is dirty within 2015
Mud total amount is close to 40,000,000 tons, it is contemplated that will break through 60,000,000 tons to the year two thousand twenty sludge yield.But it is the sludge reduction of China, steady
Fixedization, innoxious and recycling treatment utility ratio lag behind wastewater treatment rate.The decrement and recycling of current sludge are most normal
Method is anaerobic digestion.Anaerobic digestion can not only produce the energy substance that methane etc. can be utilized, moreover it is possible to react
The intermediate product of substantial amounts of organic acid is produced in journey.Especially volatile fatty acid：Acetic acid, propionic acid, n-butyric acie, isobutyric acid,
Valeric acid etc., have a wide range of applications value.Therefore, the organic matter in sludge is effectively discharged, is at utmost produced organic
Acid is the effective way for realizing residual sludge reduction and recycling.
General anaerobic sludge digestion is divided into 4 steps：Hydrolysis, acidifying, acetoxylation and methanation, whole process are more multiple
It is miscellaneous.And utilize excess sludge hydrolysis acidification to produce VFAs (volatile fatty acid) and be mainly the anaerobic digestion control by sludge in water
Solve, be acidified the two stages.Because the VFAs amounts that sludge under conventional anaerobic condition is produced are little, deficiency is met in Practical Project
The need for carbon source, therefore researcher proposes various methods to regulate and control reaction system, improves sludge hydrolysis, acidification rate, including：
Using pyrohydrolysis：50-90 DEG C, with surfactant Combined Treatment excess sludge, add Mg2+(magnesium ion) replaces metal in sludge
Ion, plus various methods such as alkali, ultrasonic pretreatment sludge.These processing methods are typically all to promote undissolved in sludge to have
Machine thing is decomposed into the organic matter of solubility, improves the biological degradability of organic matter；And during HTHP pyrohydrolysis can make sludge
The abundant broken wall of cell, the organic matter for making its intracellular discharges completely, is a kind of more preferable method for improving sludge hydrolysis, acidification rate.
The content of the invention
The present invention is for the problem that existing sludge anaerobic acidification rate of producing acid is slow, product acid amount is low, it is proposed that a kind of hot water
The method that the high temperature anaerobic acidifying of solution joint improves acidogenesis of waste activated sludge amount, this method can be made in sludge using HTHP pyrohydrolysis
The abundant broken wall of cell, the organic matter for making its intracellular under anaerobic discharges completely, compared to other sludge anaerobic acidifications
Method, the concentration of volatile fatty acid improves much in system.
The present invention uses following technical scheme：
A kind of method that pyrohydrolysis joint high temperature anaerobic acidifying improves acidogenesis of waste activated sludge amount, it is characterised in that including following
Step:
1) excess sludge predrainage：The excess sludge of urban wastewater treatment firm is carried out into predrainage, the sludge after predrainage
It is 80-85% containing the tax rate, obtains predrainage sludge；
2) HTHP pyrohydrolysis：Volume is pyrohydrolysis reactor volume 2/3 predrainage sludge is taken, hot water is positioned over
In solution retort, high-temperature high-pressure pyrohydrolysis reaction is carried out, the temperature of pyrohydrolysis retort is 160-190 DEG C, pressure is 0.5-
1.2Mpa, the reaction time is 30-60min；After reaction terminates, after pressure is slowly dropped to 0.3-0.8MPa in reactor, enter
Row pressure release is flashed, and obtains pyrohydrolysis sludge, and the moisture content for determining pyrohydrolysis sludge is generally 91-94%；
3) high temperature anaerobic acidification reaction：Take step 1) treatment predrainage sludge and step 2) treatment pyrohydrolysis sludge,
Wherein pyrohydrolysis sludge and the ratio of predrainage sludge is 4-0.25, and predrainage sludge and pyrohydrolysis sludge are fully mixed
Synthesis mixing sludge, then dilute with water mixing sludge, makes its moisture percentage in sewage sludge be 92-95%, by the mixing sludge after dilution
It is injected into high temperature anaerobic acidification reaction tank, starts high temperature anaerobic acidification reaction tank, the temperature of retort is 50-60 DEG C, high temperature
The speed of agitator of the agitator in anaerobic acidification retort is set to 60-120 turns/min, reacts 2-4 days, when detection high temperature anaerobic
The concentration of the volatile fatty acid VFAs in acidification reaction tank>2000mg/L, soluble chemical oxygen demand SCOD concentration>
Terminate during 4000mg/L reaction, hereafter retort into spoil disposal, enter mud running status, residence time of the sludge in retort is excellent
Elect as：2-6 days, the preferred residence time was 3-4 days, and the spoil disposal and inputiing mud volume will ensure that sludge is stopped in retort
Time, the sludge added be step 2) in pyrohydrolysis close sludge；
4) mud-water separation：The sludge discharged from high temperature anaerobic acidification reaction tank, is dehydrated using plate and frame filter press, real
Existing mud-water separation, the liquid isolated as higher concentration volatile fat acid solution；The volatile fatty acid of the higher concentration
Solution, the fermentation that can be used for polyhydroxyalkanoate as carbon source substitution glucose synthesizes.
It is of the invention compared with traditional sludge anaerobic acidification produces volatile fatty acid technique, sludge retention time can effectively contract
It is short：The common sludge anaerobic acidification process sludge residence time is about 8-10 days, the sludge retention time preferably 3-4 of this method
My god；Compared with pyrohydrolysis or thermophilic digestion treatment sludge is used alone, the concentration of volatile fatty acid is substantially carried in system
Height, can improve 30-50%.
Brief description of the drawings
Fig. 1 is the change in concentration figure of SCOD, VFAs of embodiments of the invention 1.
Fig. 2 is the change in concentration figure of SCOD, VFAs of embodiments of the invention 1.
Fig. 3 is the change in concentration figure of SCOD, VFAs of embodiments of the invention 1.
Specific embodiment
With reference to embodiment, the present invention will be further described：
Embodiment 1：A kind of method that pyrohydrolysis joint high temperature anaerobic acidifying improves acidogenesis of waste activated sludge amount, uses following step
Suddenly：
1) predrainage is carried out to the excess sludge of urban wastewater treatment firm using belt filter press, obtains predrainage sludge,
It is 85% to measure moisture content.
2) 80L predrainage sludge is taken, pyrohydrolysis retort is added, starts pyrohydrolysis consersion unit, pressure liter in retort
To 0.6MPa, pressure 60min, hydrolysis is kept to carry out pressure release flash distillation immediately after terminating, pressure recovers in treating whole system
To normal atmosphere (An), the mud in flash tank is taken out, you can obtain pyrohydrolysis sludge, measure the moisture content of pyrohydrolysis sludge about
The concentration for being 93%, VFAs is 2132mg/L.
3) 75L predrainage sludge is taken, 300L pyrohydrolysis sludge, after being sufficiently mixed, the moisture content for being diluted with water to sludge is
92.49%, it is added in anaerobic acidification retort, high temperature anaerobic acidification reaction is carried out, stir speed (S.S.) is 120rad/ in system
Min, temperature is 60 DEG C, spoil disposal is started after 2 days, enters mud, into semicontinuous reactiveness, residence time of the sludge in retort
It is 2-3 days, the change in concentration of SCOD, VFAs in monitoring system, the test result of SCOD, VFAs is shown in Fig. 1 in system, in system
The concentration of VFAs maintains more than 4000mg/L.
4) mud-water separation：The sludge discharged from high temperature anaerobic acidification reaction tank, is dehydrated using plate and frame filter press, real
Existing mud-water separation, the liquid isolated as higher concentration volatile fat acid solution；The volatile fatty acid of the higher concentration
Solution, the fermentation that can be used for polyhydroxyalkanoate as carbon source substitution glucose synthesizes.
Embodiment 2：A kind of method that pyrohydrolysis joint high temperature anaerobic acidifying improves acidogenesis of waste activated sludge amount, uses following step
Suddenly：
1) predrainage is carried out to the excess sludge of urban wastewater treatment firm using belt filter press, obtains predrainage sludge,
It is 83% to measure moisture content.
2) 80L predrainage sludge is taken, pyrohydrolysis retort is added, starts pyrohydrolysis consersion unit, pressure liter in retort
To 0.8MPa, pressure 30min is kept, hydrolysis terminates, and after slow pressure release to 0.6MPa, pressure release flash distillation is carried out immediately, treats
Pressure recovers to normal atmosphere (An) in whole system, the mud in flash tank is taken out, you can obtain pyrohydrolysis sludge, measure heat
The concentration that the moisture content of hydrolyzing sludge is about 91%, VFAs is 2964mg/L.
3) 160L predrainage sludge is taken, 160L pyrohydrolysis sludge, after being sufficiently mixed, the moisture content for being diluted with water to sludge is
94.15%, it is added in anaerobic acidification retort, high temperature anaerobic acidification reaction is carried out, stir speed (S.S.) is 120rad/ in system
Min, temperature is 50 DEG C, spoil disposal is started after 4 days, enters mud, and into semicontinuous reactiveness, the residence time is sludge in the reactor
3-4 days, the change in concentration of SCOD, VFAs in monitoring system, the test result of SCOD, VFAs is shown in Fig. 2 in system, VFAs in system
Concentration maintain more than 6000mg/L.
4) mud-water separation：The sludge discharged from high temperature anaerobic acidification reaction tank, is dehydrated using plate and frame filter press, real
Existing mud-water separation, the liquid isolated as higher concentration volatile fat acid solution；The volatile fatty acid of the higher concentration
Solution, the fermentation that can be used for polyhydroxyalkanoate as carbon source substitution glucose synthesizes.
Embodiment 3：A kind of method that pyrohydrolysis joint high temperature anaerobic acidifying improves acidogenesis of waste activated sludge amount, uses following step
Suddenly：
1) predrainage is carried out to the excess sludge of urban wastewater treatment firm using belt filter press, obtains predrainage sludge,
It is 85% to measure moisture content.
2) 80L predrainage sludge is taken, pyrohydrolysis retort is added, starts pyrohydrolysis consersion unit, pressure liter in retort
To 1.0MPa, pressure 30min is kept, after hydrolysis terminates, pressure release flash distillation is carried out immediately, pressure recovers in treating whole system
To normal atmosphere (An), the mud in flash tank is taken out, you can obtain pyrohydrolysis sludge, measure the moisture content of pyrohydrolysis sludge about
The concentration for being 94%, VFAs is 2655mg/L.
3) 200L predrainage sludge is taken, 50L pyrohydrolysis sludge, after being sufficiently mixed, the moisture content of sludge is 95%, is added to
In anaerobic acidification retort, high temperature anaerobic acidification reaction is carried out, stir speed (S.S.) is 120rad/min in system, temperature is 50 DEG C, 4
Start spoil disposal after it, enter mud, into semicontinuous reactiveness, the residence time is 4-7 days to sludge in the reactor, in monitoring system
The change in concentration of SCOD, VFAs, the test result of SCOD, VFAs is shown in Fig. 3 in system, and the concentration of VFAs is maintained in system
More than 4000mg/L.
4) mud-water separation：The sludge discharged from high temperature anaerobic acidification reaction tank, is dehydrated using plate and frame filter press, real
Existing mud-water separation, the liquid isolated as higher concentration volatile fat acid solution；The volatile fatty acid of the higher concentration
Solution, the fermentation that can be used for polyhydroxyalkanoate as carbon source substitution glucose synthesizes.
The present invention is processed sludge using the joint high temperature anaerobic acidifying of HTHP pyrohydrolysis, HTHP pyrohydrolysis
The cytoplasm of sludge can be allowed fully to discharge, organic matter when contributing to subsequent high temperature anaerobic acidification in sludge more effectively changes
Be volatile fatty acid, compared with pyrohydrolysis or high temperature anaerobic being used alone and is acidified, volatile fatty acid in system it is dense
Degree is significantly improved, and raising amount reaches 40%-50% in above-described embodiment.
It should be pointed out that under the premise without departing from the principles of the invention, some improvement and change can also be made, these Datong District
Small difference is improved and the technical scheme of change also should be regarded as within the protection domain of this patent.
Claims (1)
1. a kind of method that pyrohydrolysis joint high temperature anaerobic acidifying improves acidogenesis of waste activated sludge amount, it is characterised in that including following step
Suddenly:
1) excess sludge predrainage：The excess sludge of urban wastewater treatment firm is carried out into predrainage, the sludge after predrainage contains tax
Rate is 80-85%, obtains predrainage sludge；
2) HTHP pyrohydrolysis：Volume is pyrohydrolysis reactor volume 2/3 predrainage sludge is taken, pyrohydrolysis is positioned over anti-
Answer in tank, carry out high-temperature high-pressure pyrohydrolysis reaction, the temperature of pyrohydrolysis retort is 160-190 DEG C, and pressure is 0.5-1.2Mpa,
Reaction time is 30-60min；After reaction terminates, after pressure is slowly dropped to 0.3-0.8MPa in reactor, pressure release sudden strain of a muscle is carried out
Steam, obtain pyrohydrolysis sludge, the moisture content for determining pyrohydrolysis sludge is generally 91-94%；
3) high temperature anaerobic acidification reaction：Take step 1) treatment predrainage sludge and step 2) treatment pyrohydrolysis sludge, wherein
Pyrohydrolysis sludge is 4-0.25 with the volume ratio of predrainage sludge, and predrainage sludge and pyrohydrolysis sludge are fully mixed
Synthesis mixing sludge, then dilute with water mixing sludge, makes its moisture percentage in sewage sludge be 92-95%, by the mixing sludge after dilution
It is injected into high temperature anaerobic acidification reaction tank, starts high temperature anaerobic acidification reaction tank, the temperature of retort is 50-60 DEG C, high temperature
The speed of agitator of the agitator in anaerobic acidification retort is set to 60-120 turns/min, reacts 2-4 days, when detection high temperature anaerobic
The concentration of the volatile fatty acid VFAs in acidification reaction tank>2000mg/L, soluble chemical oxygen demand SCOD concentration>
Terminate during 4000mg/L reaction, hereafter retort into spoil disposal, enter mud running status, residence time of the sludge in retort is excellent
Elect as：2-6 days, the preferred residence time was 3-4 days, and the spoil disposal and inputiing mud volume will ensure that sludge is stopped in retort
Time, the sludge added be step 2) in pyrohydrolysis sludge；
4) mud-water separation：The sludge discharged from high temperature anaerobic acidification reaction tank, is dehydrated using plate and frame filter press, realizes mud
Water is separated, the liquid isolated as higher concentration volatile fat acid solution；The volatile fat acid solution of the higher concentration,
The fermentation that polyhydroxyalkanoate can be used for as carbon source substitution glucose synthesizes.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110877953A (en) * | 2019-12-24 | 2020-03-13 | 北京城市排水集团有限责任公司 | Reaction system for sludge resource utilization |
| CN111362561A (en) * | 2020-03-25 | 2020-07-03 | 北京城市排水集团有限责任公司 | Method for resource utilization of sludge |
| CN111500650A (en) * | 2020-06-30 | 2020-08-07 | 中粮营养健康研究院有限公司 | Method for efficiently producing PHA |
| CN113336404A (en) * | 2021-04-29 | 2021-09-03 | 北京城市排水集团有限责任公司 | Resource method for developing thermal hydrolysis sludge carbon source |
| CN113511787A (en) * | 2021-07-14 | 2021-10-19 | 清华大学 | Excess sludge anaerobic acidogenic fermentation method based on ultrahigh temperature system |
| CN115159792A (en) * | 2022-06-29 | 2022-10-11 | 中冶华天工程技术有限公司 | System and method for obtaining carbon source by utilizing high-temperature enhanced sludge hydrolysis |
| CN115417567A (en) * | 2022-08-30 | 2022-12-02 | 中冶华天工程技术有限公司 | Excess sludge hydrolysis acidification method based on carbon source recycling and stable dehydration performance |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110877953A (en) * | 2019-12-24 | 2020-03-13 | 北京城市排水集团有限责任公司 | Reaction system for sludge resource utilization |
| CN111362561A (en) * | 2020-03-25 | 2020-07-03 | 北京城市排水集团有限责任公司 | Method for resource utilization of sludge |
| CN111500650A (en) * | 2020-06-30 | 2020-08-07 | 中粮营养健康研究院有限公司 | Method for efficiently producing PHA |
| CN113336404A (en) * | 2021-04-29 | 2021-09-03 | 北京城市排水集团有限责任公司 | Resource method for developing thermal hydrolysis sludge carbon source |
| CN113511787A (en) * | 2021-07-14 | 2021-10-19 | 清华大学 | Excess sludge anaerobic acidogenic fermentation method based on ultrahigh temperature system |
| CN113511787B (en) * | 2021-07-14 | 2022-06-28 | 清华大学 | Excess sludge anaerobic acidogenic fermentation method based on ultrahigh temperature system |
| CN115159792A (en) * | 2022-06-29 | 2022-10-11 | 中冶华天工程技术有限公司 | System and method for obtaining carbon source by utilizing high-temperature enhanced sludge hydrolysis |
| CN115417567A (en) * | 2022-08-30 | 2022-12-02 | 中冶华天工程技术有限公司 | Excess sludge hydrolysis acidification method based on carbon source recycling and stable dehydration performance |
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Application publication date: 20170531 |