CN102492727A - Method for preparing hydrogen and methane step by step through anaerobic fermentation of excess sludge of sewage treatment - Google Patents
Method for preparing hydrogen and methane step by step through anaerobic fermentation of excess sludge of sewage treatment Download PDFInfo
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- CN102492727A CN102492727A CN2011104055298A CN201110405529A CN102492727A CN 102492727 A CN102492727 A CN 102492727A CN 2011104055298 A CN2011104055298 A CN 2011104055298A CN 201110405529 A CN201110405529 A CN 201110405529A CN 102492727 A CN102492727 A CN 102492727A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/59—Biological synthesis; Biological purification
Abstract
The invention discloses a method for preparing hydrogen and methane step by step through anaerobic fermentation of excess sludge of sewage treatment. According to the traditional excess sludge fermentation, the recovery of methane gas is mainly done, and the sludge remained after hydrogen production is not utilized. According to the method, the hydrogen and the methane are prepared step by step through two-phase anaerobic fermentation by the following steps of: pre-treating the excess sludge, fermenting the pre-treated excess sludge to produce the hydrogen, blending the excess sludge and the sludge remained after hydrogen production, and performing anaerobic fermentation on the blended mixed sludge to obtain the methane, so that energy substances in the excess sludge are furthest recovered. The method is easy to operate, is low in cost, and has economic and environmental double benefits, and the energy substances are recovered when the problem about the disposal of the excess sludge is solved.
Description
Technical field
The invention belongs to the recycling organic waste technical field, be specifically related to a kind of method of utilizing WWT excess sludge anaerobically fermenting to produce hydrogen and methane step by step.On concrete is to utilize excess sludge as fermented substrate, and through suitable pre-treatment, the substep fermentation obtains the technology of hydrogen and methane.
Technical background
Oil, coal etc. belong to non-renewable fossil energy.Modern industry increases sharply to these non-renewable fossil energy demands day by day, causes non-renewable fossil energy exhausted day by day on the one hand, then is to use fossil energy to make environmental pollution serious day by day in a large number on the other hand.The recyclability energy of exploitation high effect cleaning more and more comes into one's own, and has become the focus that everybody competitively studies.Hydrogen is a kind of green energy resource of high effect cleaning, and one kilogram of hydrogen of every burning with the heat that produces 142.35 kilojoules, is 2.75 times of gasoline, 3.9 times of alcohol, and hydrogen only produces water in combustion processes, do not discharge any objectionable impurities.Hydrogen also is one of important source material in a lot of industrial production simultaneously.At present, mainly contain two kinds of methods about producing of hydrogen: physico-chemical processes and biological process.Physico-chemical processes mainly comprises water electrolysis, methyl hydride catalyzed reformation etc., and these methods are raw materials for production with water or methane, need the energy of labor.Biological process can utilize organic waste water and organic solid waste as raw materials for production, adopts microbiological deterioration fermentation hydrogen producing in next life, is a kind of method of environmental protection and economy.
Along with Chinese society economy and development of urbanization, and the increasingly stringent of the raising of people's Environmental awareness and environmental regulation, increasing sewage work comes into operation or builds.At present, what China mainly adopted about the processing of sewage such as life is active sludge or biomembrance process treatment technology, in the process of handling, will produce a large amount of excess sludges.The a large amount of accumulation of excess sludge will become influence sanitary one big public hazards.Simultaneously, contain a large amount of organism in the excess sludge,, containing abundant biomass energy such as carbohydrate, protein, fat etc.How these energy substances are effectively recycled, had economy and environment double benefit.
The fermentation of traditional excess sludge is to be main to reclaim methane gas, and methyl hydride combustion will produce dioxide gas, be a kind of greenhouse gases.About the excess sludge ferment for hydrogen production; The patent of application number 200510066428.7 discloses " with the thermal treatment-fermentation and hydrogen production method of sewage treatment plant residual mud hydrogen manufacturing "; The patent of application number 200710035936.8 discloses " method and the device of Microwave Pretreatment sewage plant excess sludge fermentation and hydrogen production "; Two methods all utilize the excess sludge fermentation to obtain the comparatively considerable hydrogen of quantity, but all mud after producing hydrogen are not utilized.Containing a large amount of short chain organic acids in the mud behind the product hydrogen, is the good matrix of carrying out methane fermentation.Mud further utilized after hydrogen was produced in reply, in the hope of reclaiming the energy substance in the excess sludge to greatest extent.
Summary of the invention
The purpose of this invention is to provide a kind of excess sludge with WWT as the matrix substrate, utilize diphasic anaerobic fermentation substep to produce the method for hydrogen and methane, in the hope of reclaiming the energy substance in the excess sludge to greatest extent.Present method is simple to operate, and is with low cost, when solving the excess sludge handling problems, reclaims energy substance, has economy and environment double benefit.
The technical scheme that the inventive method is dealt with problems and adopted:
Step (1). the pre-treatment of excess sludge.
Earlier the excess sludge that produces in the sewage treatment process is pumped into pretreatment pool and carry out hot pre-treatment, treatment temp is 60～150 ℃, in about 30 minutes of treatment time, at ambient temperature, pretreated excess sludge is cooled to below 50 ℃ after the processing;
Step (2). pretreated excess sludge fermentation and hydrogen production.
Pretreated excess sludge pumped in the first airtight fermentor tank carry out hydrogen production through anaerobic fermentation; The temperature maintenance of hydrogen production through anaerobic fermentation is about 35 ℃, and the time length is 10～50 hours, and the first fermentor tank top is provided with pneumatic outlet; Be used for the collection of hydrogen; Anaerobically fermenting enters equalizing tank with the mud behind about 90% the product hydrogen after finishing, and the mud behind about 10% the product hydrogen is stayed in first fermentor tank, gives over to kind of a mud;
Step (3). the allotment of mud behind excess sludge and the product hydrogen.
Contain a large amount of short chain organic acids in the mud after hydrogen production through anaerobic fermentation finishes; The pH value scope of mud is between 4.0～6.0 behind this product hydrogen; The mud that will produce earlier behind the hydrogen pumps into equalizing tank; And and without the mixed that pretreated excess sludge is pressed 3:1, regulate then between pH value to 6.5～7.5 of mixing sludge;
Step (4). the mixing sludge anaerobic fermentation methane after the allotment.
Mixing sludge after the allotment is pumped into the second airtight fermentor tank carry out anaerobic fermentation methane; The methanogenic temperature maintenance of anaerobically fermenting is about 35 ℃, and 24～96 hours time length, the second fermentor tank top is provided with pneumatic outlet; Be used to collect methane; Mud after the fermentation ends behind about 90% the product methane is discharged, and the mud behind about 10% the product methane is stayed second fermentor tank, gives over to kind of a mud.
Compared with prior art, the beneficial effect that has of the present invention:
1, the fermentation of excess sludge starts in pH neutral environment, helps mikrobe and starts fast fast, and the lag phase of reaction is short;
2, mud behind the fermentation and hydrogen production and untreated mud mix by suitable proportion; Can play certain diluting effect to the acid in the mud behind the fermentation fermentation and hydrogen production; Reduce the consumption of regulating the pH material, the species diversity in the reactor drum is strengthened, help methanogenic stability;
3, containing lot of organic acids in the mud of fermentation and hydrogen production, is the matrix that methanogen utilizes easily, helps methanogenicly carrying out smoothly;
4, the mud of fermentation and hydrogen production is used for producing the biomass energy that methane can reclaim excess sludge to greatest extent;
5, produce hydrogen and divide two to carry out mutually with product methane, collect respectively, follow-up utilization is comparatively simple.
6, after fermentation and hydrogen production and the processing of fermentation product methane, the dewatering of mud improves, and sludge quantity reduces.
The present invention has the practicality that excess sludge is disposed in industry, is applicable to the disposal of various WWT excess sludges.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing the inventive method is described further.
As shown in Figure 1, the present invention realizes through following step:
Step (1). the pre-treatment of excess sludge.
Earlier the excess sludge that produces in the sewage treatment process is pumped into pretreatment pool 1 and carry out hot pre-treatment, treatment temp is 60～150 ℃, in about 30 minutes of treatment time, at ambient temperature, pretreated excess sludge is cooled to below 50 ℃ after the processing;
Step (2). pretreated excess sludge fermentation and hydrogen production.
Pretreated excess sludge pumped in the first airtight fermentor tank 2 carry out hydrogen production through anaerobic fermentation; The temperature maintenance of hydrogen production through anaerobic fermentation is about 35 ℃, and the time length is 10～50 hours, and first fermentor tank, 2 tops are provided with pneumatic outlet; Be used for the collection of hydrogen; The mud that after anaerobically fermenting finishes the mud behind about 90% the product hydrogen is entered behind the product hydrogen of equalizing tank about 3,10% is stayed in first fermentor tank 2, gives over to kind of a mud;
Step (3). the allotment of the mud behind excess sludge and the product hydrogen.
Contain a large amount of short chain organic acids in the mud after hydrogen production through anaerobic fermentation finishes; The pH value scope of mud is between 4.0～6.0 behind this product hydrogen; The mud that will produce earlier behind the hydrogen pumps into equalizing tank 3; And and without the mixed that pretreated excess sludge is pressed 3:1, regulate then between pH value to 6.5～7.5 of mixing sludge;
Step (4). the mixing sludge anaerobic fermentation methane after the allotment.
Mixing sludge after the allotment is pumped into the second airtight fermentor tank 4 carry out anaerobic fermentation methane; The methanogenic temperature maintenance of anaerobically fermenting is about 35 ℃, and 24～96 hours time length, second fermentor tank, 4 tops are provided with pneumatic outlet; Be used to collect methane; Mud after the fermentation ends behind about 90% the product methane is discharged, and the mud behind about 10% the product methane is stayed second fermentor tank 4, gives over to kind of a mud.
Embodiment 1:
Getting concentration is the excess sludge 100mL of 10.13g/L, 80 ℃ with condition of normal pressure under handle 30min, at room temperature be cooled to below 50 ℃; Then pretreated mud is transferred in the serum bottle of 250mL, and with sealing behind the nitrogen purging 3min, with the serum bottle of sealing as for fermentation and hydrogen production in the vibration shaking table; 35 ℃ of controlled temperature, 120rpm, anaerobically fermenting continues 40h; Fermentation produces gas and mainly contains hydrogen and carbonic acid gas, and wherein density of hydrogen reaches 50.9%, does not have methane to detect in the gas.
Getting the raffinate 60mL that produces the hydrogen end mixes with the untreated excess sludge of 20mL; NaOH solution with 1M is regulated pH value to 6.5, then mud is transferred in the 250mL serum bottle product hydrogen fermentation operation that all the other operations are the same; Anaerobism is produced methane fermentation and is continued 68h; The gas that fermentation produces mainly is methane and carbonic acid gas, and wherein methane concentration reaches 77.0%, has the hydrogen of minute quantity to detect.
Embodiment 2:
Getting concentration is the excess sludge 30L of 14.57g/L, 100 ℃ with condition of normal pressure under pre-treatment 20min, with transferpump mud is sent into fermentor tank 2 and carries out fermentation and hydrogen production, through well heater control fermentation jar temperature about 35 ℃.About about 16h, there is fermentation gas to produce, in the fermentor tank of the 27h left and right sides, there is internal recycle to form.Fermentation and hydrogen production has continued 53h, and the gas of generation mainly contains hydrogen and carbonic acid gas, and wherein density of hydrogen reaches 46.8%, does not have methane to detect in the gas.
Getting in the fermentor tank 1 fermentation raffinate 20L and untreated excess sludge 10L mixes in equalizing tank 3; Regulate the pH value near neutrality with the NaOH solution of 1M then; Pump into the fermentor tank 4 product methane that ferments then, through well heater control fermentation jar temperature about 35 ℃.About about 20h, there is fermentation gas to produce, in the fermentor tank of the 28h left and right sides, there is internal recycle to form.Fermentation is produced methane and has been continued 78h, and the gas of generation mainly contains methane and carbonic acid gas, and wherein methane concentration reaches 73.6%, has small quantity of hydrogen to detect in the gas.
Embodiment 3:
Getting concentration is the excess sludge 30L of 12.33g/L, 100 ℃ with condition of normal pressure under pre-treatment 20min, with transferpump mud is sent into fermentor tank 2 and carries out fermentation and hydrogen production, through well heater control fermentation jar temperature about 35 ℃.About about 16h, there is fermentation gas to produce, in the fermentor tank of the 29h left and right sides, there is internal recycle to form.Fermentation and hydrogen production has continued 50h, and the gas of generation mainly contains hydrogen and carbonic acid gas, and wherein density of hydrogen reaches 46.2%, does not have methane to detect in the gas.
Getting in the fermentor tank 1 fermentation raffinate 20L and untreated excess sludge 10L mixes in equalizing tank 3; Regulate pH value to 7.5 with the NaOH solution of 1M then; Pump into the fermentor tank 4 product methane that ferments then, through well heater control fermentation jar temperature about 35 ℃.About about 21h, there is fermentation gas to produce, in the fermentor tank of the 30h left and right sides, there is internal recycle to form.Fermentation is produced methane and has been continued 75h, and the gas of generation mainly contains methane and carbonic acid gas, and wherein methane concentration reaches 75.1%, has small quantity of hydrogen to detect in the gas.
Claims (1)
1. the method for WWT excess sludge anaerobically fermenting substep hydrogen and methane is characterized in that this method comprises the steps:
Step (1). the pre-treatment of excess sludge, specifically:
Earlier the excess sludge that produces in the sewage treatment process is pumped into pretreatment pool and carry out hot pre-treatment, treatment temp is 60～150 ℃, in about 30 minutes of treatment time, at ambient temperature, pretreated excess sludge is cooled to below 50 ℃ after the processing;
Step (2). pretreated excess sludge fermentation and hydrogen production, specifically:
Pretreated excess sludge pumped in the first airtight fermentor tank carry out hydrogen production through anaerobic fermentation; The temperature maintenance of hydrogen production through anaerobic fermentation is about 35 ℃, and the time length is 10～50 hours, and the first fermentor tank top is provided with pneumatic outlet; Be used for the collection of hydrogen; Anaerobically fermenting enters equalizing tank with the mud behind about 90% the product hydrogen after finishing, and the mud behind about 10% the product hydrogen is stayed in first fermentor tank, gives over to kind of a mud;
Step (3). the allotment of mud behind excess sludge and the product hydrogen, specifically:
Contain a large amount of short chain organic acids in the mud after hydrogen production through anaerobic fermentation finishes; The pH value scope of mud is between 4.0～6.0 behind this product hydrogen; The mud that will produce earlier behind the hydrogen pumps into equalizing tank; And and without the mixed that pretreated excess sludge is pressed 3:1, regulate then between pH value to 6.5～7.5 of mixing sludge;
Step (4). the mixing sludge anaerobic fermentation methane after the allotment, specifically:
Mixing sludge after the allotment is pumped into the second airtight fermentor tank carry out anaerobic fermentation methane; The methanogenic temperature maintenance of anaerobically fermenting is about 35 ℃, and 24～96 hours time length, the second fermentor tank top is provided with pneumatic outlet; Be used to collect methane; Mud after the fermentation ends behind about 90% the product methane is discharged, and the mud behind about 10% the product methane is stayed second fermentor tank, gives over to kind of a mud.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105819605A (en) * | 2016-04-22 | 2016-08-03 | 武汉玻尔科技股份有限公司 | Sewage treatment method for improving energy conversion efficiency |
| CN107974316A (en) * | 2016-10-25 | 2018-05-01 | 中国科学院青岛生物能源与过程研究所 | A kind of method for preparing biological hydrogen alkane fuel |
| CN108018024A (en) * | 2017-11-21 | 2018-05-11 | 齐鲁工业大学 | A kind of low-carbon environment-friendly deicing salt preparation method |
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| CN101492696A (en) * | 2008-01-26 | 2009-07-29 | 聂艳秋 | High-efficiency method for producing hydrogen gas and methyl hydride with mix fermentation of sewage sludge and garbage |
| CN101880118A (en) * | 2010-02-03 | 2010-11-10 | 王鹤立 | Energy reclaiming sludge reduction method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101492696A (en) * | 2008-01-26 | 2009-07-29 | 聂艳秋 | High-efficiency method for producing hydrogen gas and methyl hydride with mix fermentation of sewage sludge and garbage |
| CN101880118A (en) * | 2010-02-03 | 2010-11-10 | 王鹤立 | Energy reclaiming sludge reduction method |
Non-Patent Citations (1)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105819605A (en) * | 2016-04-22 | 2016-08-03 | 武汉玻尔科技股份有限公司 | Sewage treatment method for improving energy conversion efficiency |
| CN107974316A (en) * | 2016-10-25 | 2018-05-01 | 中国科学院青岛生物能源与过程研究所 | A kind of method for preparing biological hydrogen alkane fuel |
| CN108018024A (en) * | 2017-11-21 | 2018-05-11 | 齐鲁工业大学 | A kind of low-carbon environment-friendly deicing salt preparation method |
| CN108018024B (en) * | 2017-11-21 | 2020-06-16 | 齐鲁工业大学 | Preparation method of low-carbon environment-friendly snow-melting agent |
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Application publication date: 20120613 |