CN104404090A - Method for promoting residual sludge to carry out anaerobic fermentation to produce acid - Google Patents
Method for promoting residual sludge to carry out anaerobic fermentation to produce acid Download PDFInfo
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- CN104404090A CN104404090A CN201410629872.4A CN201410629872A CN104404090A CN 104404090 A CN104404090 A CN 104404090A CN 201410629872 A CN201410629872 A CN 201410629872A CN 104404090 A CN104404090 A CN 104404090A
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- 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
- C12P7/64—Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
- C12P7/6409—Fatty acids
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Abstract
The invention discloses a method for promoting residual sludge to carry out anaerobic fermentation to produce acid, and belongs to the technical field of solid waste processing and recycling. The provided method aims to solve the problems of low hydrolysis speed and insufficient short-chain aliphatic acid accumulation during the sludge anaerobic digestion process. The sludge is subjected to a nitrite pretreatment to increase the dissolution of organic matters, then the pH value is adjusted to an alkaline area to further promote the organic matter hydrolysis and short-chain aliphatic acid accumulation during the sludge anaerobic fermentation process, and at the same time the activity of microorganisms, which can produce methane, is prohibited, so the yield of short-chain aliphatic acid is increased. The provided method can effectively shorten the retention time of sludge anaerobic fermentation, increase the acid producing efficiency, and achieve the goals of sludge reduction and recycling.
Description
Technical field
The invention belongs to environment protection and solid waste resource recovery technical field, be specifically related to a kind of method utilizing the alkaline digest of nitrite pretreatment coupling to promote sludge anaerobic fermentative production short chain fatty acid.
Background technology
Along with activated sludge process is widely used in city and technique for treating industrial wastewater, the process handling problems of the excess sludge of generation receives the attention of more and more scholar, and how to test the focus that the minimizing of excess sludge and resource utilization become research.Mud is primarily of microbial population and the large amount of organic composition that depends on, and its content accounts for 60%, and the organic constituent of biological easily degraded is more than 40%, and they are the abundant nutrition sources of microorganism.Its potential carbon source is effectively utilized to become the key of research excess sludge Environmental capacity and development of resources.
In recent years, anaerobic fermentation technology, because it is simple to operate, running cost is low and byproduct value added advantages of higher, becomes a new focus of excess sludge process.Wherein, the short chain fatty acid produced in anaerobic acidification process, not only can be directly used in the additional carbon of sewage work's denitrogenation dephosphorizing, and has a wide range of applications and many potential industrial uses.Sludge anaerobic fermenting process is mainly divided into three phases: acidication stage, hydrogenesis and acetogenesis stage and methane phase stage, and hydrolysis stage is considered to the rate-limiting step in anaerobic fermentation process always.
Document 1 (Kun Luo et al.Bioresource Technology, 2011,102,7103-7110) reports sodium lauryl sulphate (SDS) and promotes sludge hydrolytic and souring stage with lytic enzyme coupling.Its shortcoming be sodium lauryl sulphate as a kind of chemical surfactant, cannot biological degradation, long-term existence has certain toxic action to environment, and the use of two kinds of reagent substantially increases running cost.
Document 2 (U.Neis et al.Journal of EnvironmentalScience and Health, Part A, 2008,43,1541-1545) adopt and ultrasonicly carry out pre-treatment to excess sludge, after research finds anaerobically fermenting, gas production rate improves 30%.But ultrasonic pretreatment method energy consumption is comparatively large, higher to equipment requirements, has certain limitation.
Summary of the invention
The object of the present invention is to provide a kind of method promoting excess sludge anaerobic fermentation and acid production.Be intended to improve sludge anaerobic fermentation hydrolysis speed, thus promote the method for fermentation and acid, nitrite pre-treatment is coupled with alkaline digest and improves anaerobically fermenting and produce organic acid output.
The technical solution realizing the object of the invention is:
The present invention adopts the alkaline digest of nitrite pretreatment coupling, is intended to improve excess sludge anaerobic fermentation and acid production amount.Specifically comprise following concrete steps:
(1) with municipal sewage plant's second pond mud for raw material, add in reactor, add nitrite (for Sodium Nitrite), keep certain pretreatment time, the free nitrous acid (FNA) that nitrite is hydrolyzed fully carries out broken wall effect to sludge microbe, and in cell, organism obtains a large amount of stripping.
(2), after regulating reactor pH value to alkalescence, fill nitrogen deoxidation 10min, sealed reactor, fully mixes sludge system, in constant temperature oscillation case, carry out anaerobically fermenting.
The consumption of the nitrite described in step (1) is NO
2 -the dry weight ratio scope of concentration and mud sample is (0.005-1.0): 1, more preferably (0.02-0.2): 1.
Excess sludge used in step (1), suggestion makes sludge pH contact with nitrite under the condition of 3.0-7.0, has reached better pretreating effect.
In step (1), pretreatment time is adjusted to 2 hours-2 days.
In step (2), reactor pH value is adjusted to 8-12.
In step (2), leavening temperature is 20-40 DEG C.Fermentation time is 2-10 days.
The present invention's application nitrite pretreatment coupling alkaline digest technology promotes that the ultimate principle of excess sludge anaerobic fermentation and acid production is:
After nitrite contacts with mud, the free nitrous acid of generation and response derivative (such as N
2o
3and NO
2), effectively can destroy the cellularstructure in mud, intracellular organism is discharged; Meanwhile, due to the cracking of microorganism, in mud flco, extracellular polymeric (EPS) is discharged, and accelerates organic stripping further, and this significantly for improve the concentration of soluble protein and sugar, can provide more substrate for producing acid phase.In addition, nitrite add the redox potential (ORP) that improve sludge system, inhibit the activity of methanogen, reduce the consumption of short chain fatty acid; By pretreated for nitrite sludge conditioning pH value to alkalescence, sludge hydrolytic can be promoted further, provide suitable growth conditions for acid-producing bacteria and suppress the activity of methanogen floras.Finally reach the accumulation of sludge anaerobic fermentation Short-Chain Fatty Acids.
Compared with prior art, its remarkable advantage is in the present invention:
(1) apply nitrite preconditioning technique, have very strong killing action to microorganism in mud.Even if at very low concentrations, also extracellular polymeric cracking can be impelled, in release cells and extracellular organism, thus strengthen the biological degradability of mud, reinforcement sludge hydrolysis effectively, the stripping of remarkable facilitation of hydrolysis stage protein and soluble sugar etc., improves the speed of sludge anaerobic fermentation and acid production, have effectively achieved the object of sludge reduction, resource utilization.
(2) using basic digestion techniques, by sludge conditioning to alkaline condition, the not only stripping of further enhanced hydrolysis stage organic matter, suppress methane phase process, short chain fatty acid is accumulated simultaneously.
(3) nitrite pre-treatment is coupled with alkaline digest, greatly can improves the stripping of mud organic matter, accelerate sludge hydrolytic speed, thus shorten the sludge fermentation time, save running cost.
(4) nitrite solution can substitute with high ammonia-nitrogen wastewater in theory, thus realizes sludge anaerobic fermentation and carry out with denitrification simultaneously; This has certain actual value to reduction sludge treatment expense, provides direction to successive projectsization application.
Accompanying drawing explanation
Fig. 1 is after the pre-treatment of different nitrite dosage, organic stripping situation in mud supernatant liquor.
Fig. 2 be sludge anaerobic ferment 6 days time, nitrite dosage is on the impact of short chain fatty acid accumulated concentrations.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described in further detail.
Embodiment 1
Get 250mL excess sludge (water ratio 97%, pH=6.87) to add in anaerobic reactor and carry out fermentation and acid.Pre-treatment nitrite dosage ensures NO
2 -=0.05g/g DS, pretreatment time is 24h, pH is 5.0.Fill nitrogen deoxidation 10min in alkaline digest process, pH value is adjusted to 9.0, and temperature of reaction is 30 ± 1 DEG C, and the residence time is 3 days in the reactor, to produce short chain fatty acid be 873 milligrams per liter.
Embodiment 2
Get 250mL excess sludge (water ratio 97%, pH=6.87) to add in anaerobic reactor and carry out fermentation and acid.Pre-treatment nitrite dosage ensures NO
2 -=0.1g/g DS, pretreatment time is 24h, pH is 5.0.Fill nitrogen deoxidation 10min in alkaline digest process, pH value is adjusted to 9.0, and temperature of reaction is 30 ± 1 DEG C, and the residence time is 3 days in the reactor, to produce short chain fatty acid be 1045 milligrams per liter.
Embodiment 3
Get 250mL excess sludge (water ratio 97%, pH=6.87) to add in anaerobic reactor and carry out fermentation and acid.Pre-treatment nitrite dosage ensures NO
2 -=0.2g/g DS, pretreatment time is 24h, pH is 5.0.Fill nitrogen deoxidation 10min in alkaline digest process, pH value is adjusted to 9.0, and temperature of reaction is 30 ± 1 DEG C, and the residence time is 3 days in the reactor, to produce short chain fatty acid be 781 milligrams per liter.
Embodiment 4
Get 250mL excess sludge (water ratio 97%, pH=6.87) to add in anaerobic reactor and carry out fermentation and acid.Pre-treatment nitrite dosage ensures NO
2 -=0.1g/g DS, pretreatment time is 24h, pH is 7.0.Fill nitrogen deoxidation 10min in alkaline digest process, pH value is adjusted to 9.0, and temperature of reaction is 30 ± 1 DEG C, and the residence time is 3 days in the reactor, to produce short chain fatty acid be 642.5 milligrams per liter.
Embodiment 5
Get 250mL excess sludge (water ratio 97%, pH=6.87) to add in anaerobic reactor and carry out fermentation and acid.Pre-treatment nitrite dosage ensures NO
2 -=0.1g/g DS, pretreatment time is 24h, pH is 5.0.Fill nitrogen deoxidation 10min in alkaline digest process, pH value is adjusted to 9.0, and temperature of reaction is 30 ± 1 DEG C, and the residence time is 6 days in the reactor, to produce short chain fatty acid be 2359.9 milligrams per liter.
Embodiment 6
Get 250mL excess sludge (water ratio 97%, pH=6.87) to add in anaerobic reactor and carry out fermentation and acid.Pre-treatment nitrite dosage ensures NO
2 -=0.2g/g DS, pretreatment time is 24h, pH is 5.0.Fill nitrogen deoxidation 10min in alkaline digest process, pH value is adjusted to 9.0, and temperature of reaction is 30 ± 1 DEG C, and the residence time is 6 days in the reactor, to produce short chain fatty acid be 1242.2 milligrams per liter.
Embodiment 7
Get 250mL excess sludge (water ratio 97%, pH=6.87) to add in anaerobic reactor and carry out fermentation and acid.Pre-treatment nitrite dosage ensures NO
2 -=0.05g/g DS, pretreatment time is 24h, pH is 5.0.Fill nitrogen deoxidation 10min in alkaline digest process, pH value is adjusted to 9.0, and temperature of reaction is 30 ± 1 DEG C, and the residence time is 6 days in the reactor, to produce short chain fatty acid be 1821.3 milligrams per liter.
Comparative example 1
Get 250mL excess sludge (water ratio 97%, pH=6.87) to add in anaerobic reactor and carry out fermentation and acid, do not add nitrite solution in pre-treatment, pretreatment time is 24h, pH is 5.0.Fill nitrogen deoxidation 10min in alkaline digest process, pH value is adjusted to 9.0, and temperature of reaction is 30 ± 1 DEG C, and the residence time is 6 days in the reactor, to produce short chain fatty acid be 818.8 milligrams per liter.
Comparative example 2
Get 250mL excess sludge (water ratio 97%, pH=6.87) to add in anaerobic reactor and carry out fermentation and acid, do not add nitrite solution in pre-treatment, pretreatment time is 24h, pH is 5.0.Fill nitrogen deoxidation 10min in alkaline digest process, pH value is adjusted to 5.0, and temperature of reaction is 30 ± 1 DEG C, and the residence time is 3 days in the reactor, to produce short chain fatty acid be 508.2 milligrams per liter.
Above-described embodiment and comparative example reflect key parameter in nitrite pretreatment coupling alkaline digest technology and mud are produced to the impact of acid; be convenient to these those skilled in the art and do suitable change and modification, what protection scope of the present invention defined with claims is as the criterion.
Fig. 1 is the pretreated hydrolysis situation of embodiment 1, embodiment 2, embodiment 3 and comparative example 1 nitrite, reflects adding of nitrite and facilitates stripping organic in mud.
Fig. 2 reflect embodiment 1, embodiment 2, embodiment 3 and comparative example 1 product acid situation, illustrate in trial stretch, nitrite dosage NO
2 -=0.1g/g DS is optimum dosage.
Above-described embodiment does not limit the present invention in any way, and the technical scheme that the mode that every employing is equal to replacement or equivalent transformation obtains all drops in protection scope of the present invention.
Claims (10)
1. one kind promotes the method for excess sludge anaerobic fermentation and acid production, it is characterized in that, first by nitrite pre-treatment, improve organic stripping in mud, again by adjust ph extremely alkalescence, carry out the accumulation that alkaline digest promotes organic hydrolysis and short chain fatty acid in sludge anaerobic fermenting process further, suppress the activity of methanogen simultaneously, thus improve the output of short chain fatty acid.
2. promotion excess sludge anaerobic fermentation and acid production method according to claim 1, is characterized in that: described mud comprises primary sludge and the excess sludge of sewage work.
3. promotion excess sludge anaerobic fermentation and acid production method according to claim 1, is characterized in that: the consumption of nitrite is the dry weight ratio scope of NO2-concentration and mud sample is (0.005-1.0): 1.
4. promotion excess sludge anaerobic fermentation and acid production method according to claim 3, is characterized in that: the consumption of nitrite is the dry weight ratio scope of NO2-concentration and mud sample is (0.02-0.2): 1.
5. promotion excess sludge anaerobic fermentation and acid production method according to claim 1, is characterized in that: in nitrite preprocessing process, sludge pH is 3.0-7.0.
6. promotion excess sludge anaerobic fermentation and acid production method according to claim 1, is characterized in that: nitrite pretreatment time is adjusted to 2 hours-2 days.
7. promotion excess sludge anaerobic fermentation and acid production method according to claim 1, is characterized in that: first fill nitrogen deoxidation before alkaline digest process; In sludge anaerobic fermenting process, pH value is adjusted to 8-12,
8. promotion excess sludge anaerobic fermentation and acid production method according to claim 7, is characterized in that: pH value is adjusted to 9-11.
9. promotion excess sludge anaerobic fermentation and acid production method according to claim 1, is characterized in that: the working time of sludge anaerobic fermentation and acid production is 2-10d.
10. promotion excess sludge anaerobic fermentation and acid production method according to claim 1, is characterized in that: sludge anaerobic leavening temperature is 20-40 DEG C.
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104450805A (en) * | 2014-11-21 | 2015-03-25 | 湖南大学 | Short-chain volatile fatty acid and preparation method thereof |
| CN105861576A (en) * | 2016-04-19 | 2016-08-17 | 湖南大学 | Method for producing volatile fatty acid (VFA) from mushroom cultured residue through alkaline fermentation |
| CN106755134A (en) * | 2017-01-12 | 2017-05-31 | 南京理工大学 | A kind of method using alkaline residue reinforced sludge anaerobic fermentation and acid production |
| CN106834365A (en) * | 2017-02-20 | 2017-06-13 | 湖南大学 | A kind of utilization sludge substrate hydro-thermal charcoal promotes the method that sludge produces SCFA |
| CN106915883A (en) * | 2017-03-13 | 2017-07-04 | 华南师范大学 | A kind of minimizing of endogenous FNA pretreating sludges and process for reclaiming |
| CN107352767A (en) * | 2017-06-22 | 2017-11-17 | 广东省生态环境技术研究所 | A kind of bioleaching hardening agent and the method for removing sludge heavy-metal |
| CN107881203A (en) * | 2017-10-25 | 2018-04-06 | 江南大学 | A kind of method for promoting excess sludge anaerobic fermentation and acid production |
| CN108330149A (en) * | 2018-04-02 | 2018-07-27 | 大连理工大学 | A method of enhancing excess sludge anaerobic fermentation and acid production performance |
| CN108441522A (en) * | 2018-03-29 | 2018-08-24 | 湖南大学 | The method that potassium hydrogen persulfate composite salts (PMS) promote excess sludge anaerobic fermentation production aliphatic acid |
| CN108624629A (en) * | 2018-06-07 | 2018-10-09 | 湖南大学 | A kind of method that contaminant degradation produces aliphatic acid simultaneously in promotion excess sludge |
| CN108728498A (en) * | 2018-06-07 | 2018-11-02 | 湖南大学 | A method of improving excess sludge hydrogen production through anaerobic fermentation |
| CN108793656A (en) * | 2018-05-25 | 2018-11-13 | 上海交通大学 | Promote the method that anaerobic sludge digestion generates methane in sewage gas purity |
| CN110002681A (en) * | 2019-04-23 | 2019-07-12 | 北京工业大学 | A kind of sludge sidestream processing unit and method based on the fermentation of nitrite reinforcement sludge |
| CN113185074A (en) * | 2021-04-12 | 2021-07-30 | 哈尔滨工业大学 | Method for promoting accumulation of sludge anaerobic fermentation short-chain fatty acids by combined pretreatment of free nitrous acid and calcium peroxide |
| CN113371957A (en) * | 2021-05-13 | 2021-09-10 | 西北矿冶研究院 | Method for treating excess sludge based on microbial electrolysis cell |
| CN113697949A (en) * | 2021-08-20 | 2021-11-26 | 中钢集团鞍山热能研究院有限公司 | Short-flow anaerobic reactor device and high-concentration organic wastewater pretreatment method |
| CN114592014A (en) * | 2022-03-22 | 2022-06-07 | 太原理工大学 | Method for enhancing acid production through anaerobic fermentation of excess sludge by photolysis of nitrate |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104450805A (en) * | 2014-11-21 | 2015-03-25 | 湖南大学 | Short-chain volatile fatty acid and preparation method thereof |
| CN105861576A (en) * | 2016-04-19 | 2016-08-17 | 湖南大学 | Method for producing volatile fatty acid (VFA) from mushroom cultured residue through alkaline fermentation |
| CN106755134A (en) * | 2017-01-12 | 2017-05-31 | 南京理工大学 | A kind of method using alkaline residue reinforced sludge anaerobic fermentation and acid production |
| CN106834365A (en) * | 2017-02-20 | 2017-06-13 | 湖南大学 | A kind of utilization sludge substrate hydro-thermal charcoal promotes the method that sludge produces SCFA |
| CN106915883B (en) * | 2017-03-13 | 2019-11-01 | 华南师范大学 | A kind of endogenous FNA pretreating sludge minimizing and process for reclaiming |
| CN106915883A (en) * | 2017-03-13 | 2017-07-04 | 华南师范大学 | A kind of minimizing of endogenous FNA pretreating sludges and process for reclaiming |
| CN107352767A (en) * | 2017-06-22 | 2017-11-17 | 广东省生态环境技术研究所 | A kind of bioleaching hardening agent and the method for removing sludge heavy-metal |
| CN107352767B (en) * | 2017-06-22 | 2020-11-24 | 广东省生态环境技术研究所 | Bioleaching enhancer and method for removing heavy metals in sludge |
| CN107881203A (en) * | 2017-10-25 | 2018-04-06 | 江南大学 | A kind of method for promoting excess sludge anaerobic fermentation and acid production |
| CN108441522A (en) * | 2018-03-29 | 2018-08-24 | 湖南大学 | The method that potassium hydrogen persulfate composite salts (PMS) promote excess sludge anaerobic fermentation production aliphatic acid |
| CN108330149A (en) * | 2018-04-02 | 2018-07-27 | 大连理工大学 | A method of enhancing excess sludge anaerobic fermentation and acid production performance |
| CN108793656B (en) * | 2018-05-25 | 2021-03-09 | 上海交通大学 | Method for improving purity of methane in biogas generated by anaerobic digestion of sludge |
| CN108793656A (en) * | 2018-05-25 | 2018-11-13 | 上海交通大学 | Promote the method that anaerobic sludge digestion generates methane in sewage gas purity |
| CN108728498A (en) * | 2018-06-07 | 2018-11-02 | 湖南大学 | A method of improving excess sludge hydrogen production through anaerobic fermentation |
| CN108624629A (en) * | 2018-06-07 | 2018-10-09 | 湖南大学 | A kind of method that contaminant degradation produces aliphatic acid simultaneously in promotion excess sludge |
| CN110002681A (en) * | 2019-04-23 | 2019-07-12 | 北京工业大学 | A kind of sludge sidestream processing unit and method based on the fermentation of nitrite reinforcement sludge |
| CN110002681B (en) * | 2019-04-23 | 2022-03-29 | 北京工业大学 | Sludge side stream treatment device and method based on nitrite-enhanced sludge fermentation |
| CN113185074A (en) * | 2021-04-12 | 2021-07-30 | 哈尔滨工业大学 | Method for promoting accumulation of sludge anaerobic fermentation short-chain fatty acids by combined pretreatment of free nitrous acid and calcium peroxide |
| CN113371957A (en) * | 2021-05-13 | 2021-09-10 | 西北矿冶研究院 | Method for treating excess sludge based on microbial electrolysis cell |
| CN113697949A (en) * | 2021-08-20 | 2021-11-26 | 中钢集团鞍山热能研究院有限公司 | Short-flow anaerobic reactor device and high-concentration organic wastewater pretreatment method |
| CN113697949B (en) * | 2021-08-20 | 2023-03-10 | 中钢集团鞍山热能研究院有限公司 | Short-process anaerobic reactor device and high-concentration organic wastewater pretreatment method |
| CN114592014A (en) * | 2022-03-22 | 2022-06-07 | 太原理工大学 | Method for enhancing acid production through anaerobic fermentation of excess sludge by photolysis of nitrate |
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