CN103343145A - Method for promoting anaerobic sludge fermentation to produce short-chain fatty acids by utilizing reduced iron powder - Google Patents
Method for promoting anaerobic sludge fermentation to produce short-chain fatty acids by utilizing reduced iron powder Download PDFInfo
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Abstract
The invention belongs to the technical field of environmental protection and recycling and relates to a method for promoting anaerobic sludge fermentation to produce short-chain fatty acids. The method comprises the following steps of: (1) putting sludge into a container, discharging the supernatant liquid, and obtaining a sludge sample; and (2) adding reduced iron powder into the sludge sample, filling nitrogen for oxygen displacement in a reactor, sealing the reactor, uniformly mixing substances in the reaction system, controlling the fermentation temperature, and performing anaerobic fermentation. The sludge can be effectively reduced, the environmental pollution is reduced, the sludge can be recycled, and lots of short-chain fatty acids with high utilization values are produced.
Description
Technical field
The invention belongs to environment protection and resource technology field, relate to a kind of method that promotes sludge anaerobic fermentative production short chain fatty acid.
Background technology
Biological treatment is as a kind of second-stage treatment method of municipal sewage treatment, utilize microorganism in the system to finish degraded to organic pollutant, be the technology of main purpose to remove suspended substance and solvability biodegradable organic, obtained at present using widely.Yet in biological treatment, can produce and be rich in organic mud (comprising primary sludge and excess sludge) in a large number.According to estimates, by the end of the end of the year 2010, the sludge yield of China has reached 4,000,000 tons (dry weights), and the environmental pollution of generation is serious day by day, it is carried out suitable processing dispose very urgent.
Anaerobically fermenting utilizes the effect of anaerobion, can effectively a large amount of organic matter degradations that exist in the mud be converted into methane (CH
4), hydrogen (H
2) wait the energy substance that can utilize again.Short chain fatty acid (comprises acetic acid, propionic acid, butanic acid, isopropylformic acid, positive valeric acid and isovaleric acid etc.) also be a class important intermediate product in the sludge anaerobic fermenting process, it has wide range of applications, and is not only indispensable raw materials such as synthetic paint, coating and makeup, and can provides requisite organic carbon source for denitrogenation dephosphorizing microorganism in the sewage.Studies have shown that in reinforced sewage Biological Phosphorus Removal System (EBPR), every removal 1mg phosphorus need consume short chain fatty acid (Water Science and Technology, 1992,25 (4-5): 185-194) of 6-9mg.Therefore, for effectively removing the phosphorus in the sewage, prevent the too high environment water eutrophication that causes of water outlet phosphorus, sewage work must provide a large amount of organic carbon sources that is easily utilized by microorganism.Yet under most situations, the content of the short chain fatty acid in the sewage all can not meet the demands, and especially in southern municipal effluent, organic carbon source is more not enough, causes in the water outlet phosphorus content too high, causes the eutrophication of environment water.
In the biological carbon and phosphorous removal system of sewage work, a kind of method that improves sewage organic carbon source concentration cost-effectively is to utilize the organic substance that itself exists in the biological treatment system, and the processing through suitable changes into the required carbon source of denitrogenation dephosphorizing microorganism.Mud is the waste material that forms after sewage work's sewage disposal, the hazardous and noxious substances that wherein contains, to produce bigger pollution to environment as heavy metal ion and pathogenic bacteria etc., but but be rich in organic substance in the mud, content is at (excess sludge particularly more than 50%, its organic content is higher), mainly easily utilized the organic constituent of degraded by microorganism with protein and polysaccharide etc., they can be converted into the energy product that can utilize again by microbial metabolism under the anaerobically fermenting condition, as methane (CH
4), hydrogen (H
2) and short chain fatty acid (SCFAs) etc.Therefore, if can effectively the organism in the mud be converted into short chain fatty acid, with realizing the minimizing of sludge treatment, innoxious and resource utilization, improve the effect of the denitrogenation dephosphorizing of sewage work simultaneously.This seminar there are some researches show that excess sludge can be utilized by microorganism under certain conditions and be converted into organic acid (Chinese invention patent, application number 200410067292.7).
The anaerobically fermenting of mud mainly can be divided into three phases, i.e. acidication, product acid and product methane phase.The production of short chain fatty acid mainly is to be produced by preceding two stages control, and it is generally acknowledged that the acidication stage speed is slower, is the rate-limiting step that sludge fermentation is produced acid.Therefore, most research lays particular emphasis on seeks the sludge retention time that the method that improves sludge hydrolytic speed shortens fermentation system, improves the output of short chain fatty acid.At present, the method of extensively having been approved that is used for raising sludge hydrolytic speed mainly contains: high-temperature heat treatment, freeze thawing treatment, mechanical treatment, ultrasonication, chemical treatment (comprise the adjusting of pH, tensio-active agent add), its ultimate principle all is that to make the organism decomposition and inversion of those non-solubility particulate forms in the mud be that micromolecular dissolved matter is utilized by microorganism, yet less at improving the method for producing acid phase speed.
Reduced iron powder has stronger reducing power, on the one hand can with mud in organic substance form iron-carbon dioxide process carbon electrode, the structure of destroying particulate organic matter is easily utilized it by microbial transformation; Also can reduce the redox potential of system on the other hand, provide microorganism required ferro element, improve the activity of acid-producing microorganisms, thereby improve speed and the output of sludge anaerobic fermentative production short chain fatty acid.So far, the relevant research that utilizes reduced iron powder to promote sludge fermentation to produce short chain fatty acid does not have report as yet.
Summary of the invention
The objective of the invention is to provides a kind of method of utilizing reduced iron powder to promote sludge anaerobic fermentative production short chain fatty acid for overcoming the existing defective that reaches.
For achieving the above object, the present invention is by the following technical solutions:
A kind of method that promotes sludge anaerobic fermentative production short chain fatty acid may further comprise the steps:
(1) it is quiet naturally heavy mud to be put into container, and the supernatant liquid of draining then obtains mud sample;
(2) add reduced iron powder in mud sample, and reactor is filled nitrogen drive oxygen, sealed reactor mixes the reaction system material, and the control leavening temperature carries out anaerobically fermenting.
Step (2) does not regulate during the fermentation that pH fluctuates in the pH(fermenting process in the 6.5-8.0 scope), by the acid-producing microorganisms combined action in reduced iron powder and the mud organism (being mainly materials such as protein and polysaccharide) of non-dissolved state in the mud is converted into short chain fatty acid and (comprises acetic acid, propionic acid, isopropylformic acid, butanic acid, isovaleric acid and positive valeric acid etc.), finish the process that reduced iron powder promotes the excess sludge anaerobic fermentation and acid production.
Described mud is sludge of sewage treatment plants, comprises in primary sludge or the excess sludge one or both, and preferably, the blending ratio of primary sludge and excess sludge (dry weight) scope is 30:70-0:100.
In the described step (1), mud in container under 4 ℃ of conditions quiet naturally heavy 24h.
The ratio range of the consumption of described reduced iron powder and the dry weight of mud sample is (0.006～1.2): 1, more preferably (0.03～0.6): 1.
Described reduced iron powder is divided into millimeter level iron powder, micron order iron powder or nano grade iron powder, and its particle size range is 50nm-0.25mm, more preferably 50nm-0.15mm.
In the described step (2), fill nitrogen and drive oxygen 10min.
In the described step (2), the mixing rotating speed of material is 100-110rpm/min in the reaction system.
In the described step (2), mud sample anaerobically fermenting temperature in reactor is 10-55 ℃, more preferably 20-35 ℃.
In the described step (2), be 4-8d the working time of sludge anaerobic fermentation and acid production.
In the described step (2), in the anaerobic fermentation process, the pH scope of anaerobic fermentation system is 6.5-8.0.
In a preferred embodiment, the ratio range of reduced iron powder consumption and mud dry weight is (0.03～0.6): 1.Though the ratio of described reduced iron powder consumption and mud dry weight can both promote the organism in the mud to be converted into target lipid acid in the scope of 0.006:1-1.2:1, and within the specific limits, increase along with the reduced iron powder amount, promoter action to sludge anaerobic fermentation and acid production is more obvious, and the cumulative concentration of short chain fatty acid is more high.But take all factors into consideration the relation of the cumulative withdrawal of raw materials cost and short chain fatty acid, the comparatively ideal reduced iron powder consumption that the present invention adopts and the ratio range of mud dry weight are 0.03:1-0.6:1.
The ultimate principle of utilizing reduced iron powder to promote the sludge of sewage treatment plant anaerobically fermenting to produce short chain fatty acid among the present invention is:
Reduced iron powder is a kind of more active metal, its electropotential E
0(Fe
2+/ Fe)=-0.440V, have stronger reducing power.Under churned mechanically effect, granule sludge is subjected to effects such as shearing on the one hand, the broken decomposition, the macromolecular substance of Sludge Surface (mainly being protein and polysaccharose substance) can break away from mud granule and enter water, reduced iron powder and mud mixture mix on the other hand, can with mud in organism form iron-carbon dioxide process carbon electrode, destroy the chemical structure of particulate organic matter, make it be converted into the small-molecule substance that is easily utilized by acid-producing microorganisms, increase concentration of substrate, therefore can promote the accumulation of short chain fatty acid; The condition of sludge anaerobic fermentation and acid production needs control in addition, the acid-producing bacteria major part is anerobe or facultative anaerobe, need under lower redox potential condition, can effectively the organism in the mud be converted into the target organic acid, and reduced iron powder is as a kind of reductive agent, can with the oxygen (O of sludge fermentation system
2) wait reaction, reduce the redox potential in the fermentation system, for acid-producing microorganisms provides suitable anaerobic environment; In addition, in the process of sludge anaerobic fermentative production short chain fatty acid, at first by hydrolytic action main organic substance (protein and polysaccharide etc.) hydrolysis in the mud is converted into small-molecule substances such as amino acid and monose, in the cell of acid-producing microorganisms, be converted into the end products based on short chain fatty acid then, justacrine is to the extracellular, this metabolic process relates to the participation of a large amount of transfer transport and multiple important metabolic enzyme, reduced iron powder can promote the Metabolic activity of microorganism to be conducive to the production that acid-producing bacteria carries out short chain fatty acid as a kind of electron donor; The iron ion that its oxidation produces also is the bioelement of microorganism growth, can effectively improve the activity of producing the many key enzymes of acid phase, for example participate in a kind of key enzyme pyruvic acid ferritin oxydo-reductase (the pyruvate-ferredoxin oxidoreductase in the acid process, POR) just comprise the Fe-S clustering architecture, these effects of reduced iron powder have all improved the activity of acid-producing microorganisms greatly, accelerate its metabolic rate, thereby improved speed and the output of sludge anaerobic fermentative production short chain fatty acid.
Utilizing reduced iron powder to promote that the condition of fermentation and acid need be well controlled, and prevents from entering the product methane phase in the process of sludge anaerobic fermentative production short chain fatty acid, consume the product that produces acid phase, be unfavorable for the accumulation of short chain fatty acid.The fermentation condition of major control comprises among the present invention: the blending ratio of primary sludge and excess sludge, the adding concentration, operating temperature and the mud residence time in reactor of reduced iron powder.Among the present invention, reduced iron powder has promoter action to the production of the short chain fatty acid of primary sludge and excess sludge, but organic content is compared primary sludge and is wanted high in the excess sludge, more be conducive to the production of short chain fatty acid, therefore more excellent primary sludge and the blending ratio (dry weight, per-cent %) of excess sludge are 30:70-0:100.Among the present invention, the ratio of reduced iron powder consumption and mud dry weight can both promote effectively that in the scope of 0.006:1-1.2:1 the organism in the mud is converted into target lipid acid, and within the specific limits, increase along with the reduced iron powder amount, the promoter action that sludge fermentation is produced acid strengthens, and the cumulative concentration of short chain fatty acid improves.But take all factors into consideration the relation of the cumulative withdrawal of raw materials cost and short chain fatty acid, the comparatively ideal reduced iron powder consumption that the present invention adopts and the ratio range of mud dry weight are 0.03:1-0.6:1.Operating temperature will influence microbic activity in the hydrolysis efficiency of fermented sludge and the system, thereby influence the accumulation of short chain fatty acid, and among the present invention, the experiment condition temperature controlling range is 10-55 ℃, and comparatively desirable scope is 20-35 ℃.In addition, the residence time of mud in reactor also influences the accumulation of short chain fatty acid, it is generally acknowledged that the residence time of mud is less than 8d, the acid-producing bacteria activity is higher, be conducive to the accumulation of short chain fatty acid, and surpassing 8d when the residence time of mud, environment of system more is conducive to the activity of methanogen, and the product short chain fatty acid that produces acid phase is converted into methane.The residence time of mud in reactor is 4-8d among the present invention, and the comparatively desirable residence time is 4-6d.
The effect efficiency that advantage of the present invention and practice produce comprises:
1. the mud that utilizes municipal sewage plant self to produce carries out the production of short chain fatty acid, the minimizing of mud, innoxious and resource utilization have not only been realized, reduced in the mud organic pollutant to the pollution destruction of environment, and the short chain fatty acid of transform producing has higher utility value, meets the theory of recycling economy.
2. mud transforms the short chain fatty acid of producing and can effectively remedy organic carbon source defect of insufficient in the municipal wastewater treatment plant biological denitrification phosphorous removal technique, satisfy the denitrogenation dephosphorizing microorganism to the demand of organic carbon source, improve the effect of this technology denitrogenation dephosphorizing, reduce thes concentrating of nutrients such as nitrogen, phosphorus in the sewage disposal plant effluent, prevent the generation of environment water eutrophy phenomenon.
3. reduced iron powder can promote the decomposition and inversion of macromole in the mud, difficult decomposing organic matter, obtaining more can be for the substrate of acid-producing microorganisms utilization, and by good anaerobic environment is provided, and acid-producing microorganisms and the required Fe element of product acid enzyme, promote sludge anaerobic fermentation and acid production speed and output, shorten sludge fermentation effectively and produce the time of acid, reduce the volume of sludge treating system, reduce running cost.
Embodiment
Further specify the present invention below in conjunction with embodiment.
Embodiment 1
(1) be in the 5.0L synthetic glass reactor in working volume, add the supernatant liquid of behind quiet naturally heavy 24h, draining that traditional activated sludge process produces, the excess sludge that obtains (pH=6.8) is produced the substrate (be mud sample, following examples together) of short chain fatty acid as anaerobically fermenting;
(2) add particle diameter 0.15mm reduced iron powder in reactor, the ratio of its consumption and mud dry weight is 0.3:1, reactor is filled nitrogen drive oxygen 10min, and sealed reactor ferments.By the combined action of the microorganism in the mud and reduced iron powder, the organism that contains in the mud is converted into short chain fatty acid.Wherein controlling the fermentation reaction temperature is 20 ± 1 ℃, and the pH of fermentation system changes in the 6.5-8.0 scope, and the residence time of mud in reactor is 4d, and the content of the short chain fatty acid of production is that 360.54mg/L(is in chemical oxygen demand (COD)).
Embodiment 2
(1) be in the 5.0L synthetic glass reactor in working volume, add that traditional activated sludge process produces through the quiet naturally heavy 24h supernatant liquid of draining, the excess sludge that obtains (pH=6.8) is as the substrate of anaerobically fermenting production short chain fatty acid;
(2) add particle diameter 0.15mm reduced iron powder in reactor, the ratio of its consumption and mud dry weight is 1.2:1, reactor is filled nitrogen drive oxygen 10min, and sealed reactor ferments.By the combined action of the microorganism in the mud and reduced iron powder, the organism that contains in the mud is converted into short chain fatty acid.Wherein temperature of reaction is 20 ± 1 ℃, and the pH of fermentation system changes in the 6.5-8.0 scope, and the residence time of mud in reactor is 5d, and the content of the short chain fatty acid of production is that 473.67mg/L(is in chemical oxygen demand (COD)).
Embodiment 3
(1) be in the 5.0L synthetic glass reactor in working volume, add the quiet heavy 24h of the nature of hanging oneself that traditional activated sludge process the produces supernatant liquid of draining, the excess sludge that obtains (pH=6.8) is produced the substrate of short chain fatty acid as anaerobically fermenting;
(2) add particle diameter 10 μ m reduced iron powders in reactor, the ratio of its consumption and mud dry weight is 0.3:1, reactor is filled nitrogen drive oxygen 10min, and sealed reactor ferments.By the combined action of the microorganism in the mud and reduced iron powder, the organism that contains in the mud is converted into short chain fatty acid.Wherein temperature of reaction is 20 ± 1 ℃, and the pH of fermentation system changes in the 6.5-8.0 scope, and the residence time of mud in reactor is 5d, and the content of the short chain fatty acid of production is that 620.92mg/L(is in chemical oxygen demand (COD)).
Embodiment 4
(1) be in the 5.0L synthetic glass reactor in working volume, add that traditional activated sludge process produces through the quiet naturally heavy 24h supernatant liquid of draining, the excess sludge that obtains (pH=6.8) is as the substrate of anaerobically fermenting production short chain fatty acid;
(2) add particle diameter 80nm reduced iron powder in reactor, the ratio of its consumption and mud dry weight is 0.006:1, reactor is filled nitrogen drive oxygen 10min, and sealed reactor ferments.By the combined action of the microorganism in the mud and reduced iron powder, the organism that contains in the mud is converted into short chain fatty acid.Wherein temperature of reaction is 20 ± 1 ℃, and the pH of fermentation system changes in the 6.5-8.0 scope, and the residence time of mud in reactor is 4d, and the content of the short chain fatty acid of production is that 305.47mg/L(is in chemical oxygen demand (COD)).
Embodiment 5
(1) be in the 5.0L synthetic glass reactor in working volume, add that traditional activated sludge process produces through the quiet naturally heavy 24h supernatant liquid of draining, the excess sludge that obtains (pH=6.8) is as the substrate of anaerobically fermenting production short chain fatty acid;
(2) add particle diameter 80nm reduced iron powder in reactor, the ratio of its consumption and mud dry weight is 0.06:1, reactor is filled nitrogen drive oxygen 10min, and sealed reactor ferments.By the combined action of the microorganism in the mud and reduced iron powder, the organism that contains in the mud is converted into short chain fatty acid.Wherein temperature of reaction is 20 ± 1 ℃, and the pH of fermentation system changes in the 6.5-8.0 scope, and the residence time of mud in reactor is 4d, and the content of the short chain fatty acid of production is that 575.55mg/L(is in chemical oxygen demand (COD)).
Embodiment 6
(1) be in the 5.0L synthetic glass reactor in working volume, add the supernatant liquid of draining through quiet naturally heavy 24h, the primary sludge that obtains (pH=6.7) is as the substrate of anaerobically fermenting production short chain fatty acid;
(2) add particle diameter 80nm reduced iron powder in reactor, the ratio of its consumption and mud dry weight is 0.06:1, reactor is filled nitrogen drive oxygen 10min, and sealed reactor ferments.By the combined action of the microorganism in the mud and reduced iron powder, the organism that contains in the mud is converted into short chain fatty acid.Wherein temperature of reaction is 20 ± 1 ℃, and the pH of fermentation system changes in the 6.5-8.0 scope, and the residence time of mud in reactor is 5d, and the content of the short chain fatty acid of production is that 383.07mg/L(is in chemical oxygen demand (COD)).
Embodiment 7
(1) be in the 5.0L synthetic glass reactor in working volume, add that traditional activated sludge process produces through the quiet naturally heavy 24h supernatant liquid of draining, the excess sludge that obtains (pH=6.8) is as the substrate of anaerobically fermenting production short chain fatty acid;
(2) add particle diameter 80nm reduced iron powder in reactor, the ratio of its consumption and mud dry weight is 0.12:1, reactor is filled nitrogen drive oxygen 10min, and sealed reactor ferments.By the combined action of the microorganism in the mud and reduced iron powder, the organism that contains in the mud is converted into short chain fatty acid.Wherein temperature of reaction is 20 ± 1 ℃, and the pH of fermentation system changes in the 6.5-8.0 scope, and the residence time of mud in reactor is 5d, and the content of the short chain fatty acid of production is that 1126.19mg/L(is in chemical oxygen demand (COD)).
Embodiment 8
(1) be in the 5.0L synthetic glass reactor in working volume, adding is through the quiet naturally heavy 24h supernatant liquid of draining, equal proportion (the 50%:50% that obtains, dry weight) primary sludge and excess sludge, the mixing sludge of forming (mud that primary sludge and excess sludge equal proportion (50%:50%, dry weight) are mixed) (pH=6.7) is produced the substrate of short chain fatty acid as anaerobically fermenting;
(2) add particle diameter 80nm reduced iron powder in reactor, the ratio of its consumption and mud dry weight is 0.12:1, reactor is filled nitrogen drive oxygen 10min, and sealed reactor ferments.By the combined action of the microorganism in the mud and reduced iron powder, the organism that contains in the mud is converted into short chain fatty acid.Wherein temperature of reaction is 20 ± 1 ℃, and the pH of fermentation system changes in the 6.5-8.0 scope, and the residence time of mud in reactor is 6d, and the content of the short chain fatty acid of production is that 823.07mg/L(is in chemical oxygen demand (COD)).
Embodiment 9
(1) be in the 5.0L synthetic glass reactor in working volume, add that traditional activated sludge process produces through the quiet naturally heavy 24h supernatant liquid of draining, the excess sludge that obtains (pH=6.8) is as the substrate of anaerobically fermenting production short chain fatty acid;
(2) add particle diameter 80nm reduced iron powder in reactor, the ratio of its consumption and mud dry weight is 0.12:1, reactor is filled nitrogen drive oxygen 10min, and sealed reactor ferments.By the combined action of the microorganism in the mud and reduced iron powder, the organism that contains in the mud is converted into short chain fatty acid.Wherein temperature of reaction is 35 ± 1 ℃, and the pH of fermentation system changes in the 6.5-8.0 scope, and the residence time of mud in reactor is 5d, and the content of the short chain fatty acid of production is that 1723.07mg/L(is in chemical oxygen demand (COD)).
Comparative Examples 1
Be in the 5.0L synthetic glass reactor in working volume, add that traditional activated sludge process produces through the quiet naturally heavy 24h supernatant liquid of draining, the excess sludge that obtains (pH=6.8) is produced the substrate of short chain fatty acid as anaerobically fermenting, do not add reduced iron powder, reactor is filled nitrogen drive oxygen 10min, sealed reactor ferments.Only the microbial process that contains by mud itself is converted into short chain fatty acid with the organism that contains in the mud.Wherein temperature of reaction is 20 ± 1 ℃, and the pH of fermentation system changes in the 6.5-8.0 scope, and the residence time of mud in reactor is 6d, and the content of the short chain fatty acid of production is that 239.14mg/L(is in chemical oxygen demand (COD)).
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not breaking away from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (10)
1. method that promotes sludge anaerobic fermentative production short chain fatty acid is characterized in that: may further comprise the steps:
(1) it is quiet naturally heavy mud to be put into container, and the supernatant liquid of draining then obtains mud sample;
(2) add reduced iron powder in mud sample, and reactor is filled nitrogen drive oxygen, sealed reactor mixes the reaction system material, and the control leavening temperature carries out anaerobically fermenting.
2. method according to claim 1, it is characterized in that: described mud is sludge of sewage treatment plants, comprises in primary sludge or the excess sludge one or both, preferably, the blending ratio of primary sludge and excess sludge is 30:70-0:100, with dry weight basis.
3. method according to claim 1 is characterized in that: in the described step (1), mud in container under 4 ℃ of conditions quiet naturally heavy 24h.
4. method according to claim 1 is characterized in that: the ratio range of the consumption of described reduced iron powder and the dry weight of mud sample is (0.006～1.2): 1, more preferably (0.03～0.6): 1.
5. method according to claim 1 is characterized in that: described reduced iron powder is divided into a millimeter level iron powder, micron order iron powder or nano grade iron powder, and its particle size range is 50nm-0.25mm, more preferably 50nm-0.15mm.
6. method according to claim 1 is characterized in that: in the described step (2), fill nitrogen and drive oxygen 10min.
7. method according to claim 1 is characterized in that: in the described step (2), the mixing rotating speed of material is 100-110rpm/min in the reaction system.
8. method according to claim 1, it is characterized in that: in the described step (2), mud sample anaerobically fermenting temperature in reactor is 10-55 ℃, more preferably 20-35 ℃.
9. method according to claim 1, it is characterized in that: in the described step (2), be 4-8d the working time of sludge anaerobic fermentation and acid production.
10. method according to claim 1, it is characterized in that: in the described step (2), in the anaerobic fermentation process, the pH scope of anaerobic fermentation system is 6.5-8.0.
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| CN108265087B (en) * | 2018-01-30 | 2021-10-19 | 河海大学 | Method for promoting anaerobic fermentation of sludge to produce volatile fatty acid |
| CN108265087A (en) * | 2018-01-30 | 2018-07-10 | 河海大学 | A kind of method for promoting sludge anaerobic fermenting and producing volatile fatty acid |
| CN110066082A (en) * | 2019-04-16 | 2019-07-30 | 浙江大学 | A kind of synchronous sludge anaerobic fermentation processing method for strengthening production acid and dephosphorization |
| CN110734933A (en) * | 2019-10-30 | 2020-01-31 | 同济大学 | Method for improving medium-chain fatty acid yield of anaerobic fermentation of waste activated sludge |
| CN110734933B (en) * | 2019-10-30 | 2023-04-07 | 同济大学 | Method for improving medium-chain fatty acid yield of anaerobic fermentation of waste activated sludge |
| CN111762986A (en) * | 2020-06-04 | 2020-10-13 | 昆明理工大学 | Method and device for stabilizing heavy metals in electrically-promoted and strengthened anaerobic fermentation sludge |
| CN111762986B (en) * | 2020-06-04 | 2021-10-29 | 昆明理工大学 | Method and device for stabilizing heavy metals in electrically-promoted and strengthened anaerobic fermentation sludge |
| CN111909970A (en) * | 2020-08-10 | 2020-11-10 | 北京化工大学 | Method for producing medium-chain fatty acid by fermentation of exogenous medium reinforced anaerobic microorganisms |
| CN111909970B (en) * | 2020-08-10 | 2023-03-10 | 北京化工大学 | Method for producing medium-chain fatty acid by fermentation of exogenous medium reinforced anaerobic microorganisms |
| CN112279478A (en) * | 2020-10-23 | 2021-01-29 | 国河环境研究院(南京)有限公司 | Method for recovering phosphorus in excess sludge in form of vivianite |
| CN115432897A (en) * | 2022-10-25 | 2022-12-06 | 西安建筑科技大学 | Method for promoting excess sludge to produce methane based on citric acid reinforced zero-valent iron |
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