CN101654322A - Method for producing methane by sludge - Google Patents
Method for producing methane by sludge Download PDFInfo
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- CN101654322A CN101654322A CN200910195302A CN200910195302A CN101654322A CN 101654322 A CN101654322 A CN 101654322A CN 200910195302 A CN200910195302 A CN 200910195302A CN 200910195302 A CN200910195302 A CN 200910195302A CN 101654322 A CN101654322 A CN 101654322A
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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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Abstract
The invention relates to an application of sludge as a source and discloses a method for producing methane by sludge, comprising the following steps: carrying out the anaerobic fermentation of the sludge under the alkali condition for 4-12 days so as to hydrolyze the sludge and acidate a hydrolyzed sludge solution; adjusting the pH value of the fermented mixture to be neutral, adding 8-15V% anaerobic granular sludge in the fermented mixture and continuously carrying out anaerobic fermentation at 30-40 DEG C for 6-14 days to generate methane. The method for producing methane by sludge not onlyobviously improves the yield of the methane produced by sludge, but also is beneficial to reducing the sludge pollution to the environment.
Description
Technical field
The present invention relates to the recycling of mud, relate in particular to a kind of method of producing methane by sludge.
Background technology
Wastewater Treated by Activated Sludge Process waste water is widely used, and the biologic treating technique of consequent discarded active sludge also is being widely studied (for example, document Journal of Bioscience and Bioengineering, 2000,89,145-150; Water research, 2000,34,725-734).Activated sludge process is widely used in handling trade effluent and sanitary sewage for a long time, thus some country set up the recovery and reuse residual active sludge scheme (as, impose in the soil as nutritive element).But this justice can cause second environmental pollution, because remove in the mud and contain a large amount of organism, outside the nutritive substances such as abundant nitrogen, phosphorus, there are other poisonous and harmful elements such as pathogenic bacterium, parasite and heavy metal simultaneously, so some countries then take to abandon the processing means with landfill.At present, new legal provisions are forbidden abandoning of biosolids and landfill, and therefore the recycling to mud becomes an important research direction, for example, utilize mud to produce methane.
Mud produces methane generally through hydrolysis, acidifying and product methane three phases.In order to improve the methanogenic effect of mud, adopt preprocessing means such as high temperature, ultrasonic wave in the document usually, the pretreated method of these mud mainly is that the methanogenic efficient of mud is still not high based on the hydrolysis rate of raising mud.
Summary of the invention
The present invention will solve mud and produce the not high technical problem of methane efficient, provides that a kind of to produce sour effect be the method that the basis significantly improves the producing methane by sludge of methane quantum of output to improve sludge hydrolytic and hydrolyzed solution simultaneously.
In order to solve the problems of the technologies described above, the method for producing methane by sludge of the present invention may further comprise the steps:
With mud anaerobically fermenting 4～12 days under alkaline condition, with hydrolyzing sludge, and with this sludge hydrolytic liquid acidifying;
The pH value of fermenting mixture is adjusted to neutrality, and to add volume percent be 8～15% anaerobic grain sludge, continue anaerobically fermentings down at 30 ℃～40 ℃ and produced methane in 6～14 days.
Preferably, the pH value of described alkaline condition is 8～10, and is preferred, and this pH value is 10.
Preferably, described mud anaerobically fermenting 8 days under alkaline condition.
Preferably, the volume percent of described anaerobic grain sludge adding is 12.5%; The temperature of described continuation anaerobically fermenting is 35 ℃; The time of described continuation anaerobically fermenting is 8 days.
Preferably, in anaerobic fermentation process, fermenting mixture is stirred, so that fermentation evenly, stirring velocity is 40～100 rev/mins, and is preferred, and stirring velocity is 80 rev/mins.
The method of producing methane by sludge of the present invention has not only significantly improved the output of methane, and makes the organism in the mud obtain recovery and reuse more fully, has reduced the pollution of mud to environment.
Embodiment
Produce methane efficient for improving mud, the present invention finds to adopt the method for following producing methane by sludge of the present invention through repeatedly experiment repeatedly, can significantly improve methane production.
The method of producing methane by sludge of the present invention may further comprise the steps:
With mud anaerobically fermenting 4～12 days under alkaline condition, with hydrolyzing sludge, and with this sludge hydrolytic liquid acidifying;
The pH value of fermenting mixture is adjusted to neutrality, and to add volume percent be 8～15% anaerobic grain sludge, continue anaerobically fermentings down at 30 ℃～40 ℃ and produced methane in 6～14 days.
The inventive method is before producing methane, earlier with mud the alkaline condition bottom fermentation of pH=8～10 4～12 days, sludge hydrolytic speed is improved significantly, produce a large amount of materials such as solvability carbohydrate, and also be improved by the product acid efficient that the solvability carbohydrate generates acid intermediate, produce more short chain fatty acid (particularly acetate), this provides abundant carbon source for producing methane phase, lays the first stone for improving methane production.
The present invention produces methane phase the pH value of fermenting mixture is adjusted to neutrality, and to add volume percent be 8～15% anaerobic grain sludge, continues anaerobically fermenting 6～14 days down at medium temperature condition (30 ℃～40 ℃), realizes producing the maximization of methane content.The inventive method has significantly improved mud and has produced methane content by mud alkaline hydrolysis, acidifying conditional parameter are combined with the technological parameter of producing methane phase.
Found through experiments, the present invention elder generation room temperature under the alkaline condition of pH10 was fermented 8 days, and the concentration of the short chain fatty acid of acquisition is the highest.
Discover that further the inventive method is being produced methane phase, be 12.5% anaerobic grain sludge, continue anaerobically fermenting down in the time of 8 days, produce methane content and reach maximum at 35 ℃ when adding volume percent.
Among the present invention, for making fermentation evenly, in anaerobic fermentation process, fermenting mixture is stirred, stirring velocity is 40～100 rev/mins, and preferred, this stirring velocity is 80 rev/mins.
Below in conjunction with embodiment the present invention is described in further detail:
Embodiment 1
32L mud is joined on average in 8 identical 6L reactors (reactor is that synthetic glass is made, internal diameter 150mm, high 350mm, be cylinder shape), be controlled to be 4,5,6,7,8,9,10 respectively at pH, the time, through 4,6,8,10,12 days hydrolysis acid processes, 21 ℃ of temperature, stirring velocity 80r/min.Recording hydrolysis, to produce sour top condition be pH=10, and through 8 days, the peak concentration of short chain fatty acid was 2957mg/L.
Embodiment 2
16L mud is on average joined in 4 identical 6L reactors, be controlled to be 10 at pH, through 8 days hydrolysis acid processes, 21 ℃ of temperature, stirring velocity were controlled to be 40,60,80 respectively, 100r/min.Record hydrolysis and produce sour top condition when being stirring velocity 80r/min, the peak concentration of short chain fatty acid is 2957mg/L.
Embodiment 3
4L mud is joined in the reactor of 6L, stir 8d under the condition of 21 ℃ of pH6, temperature, the concentration that records short chain fatty acid is 522.3mg/L.Temperature with reactor is controlled at 35 ℃ then, and the pH of mixture is adjusted to 7, inoculates 0.5L (12.5%) anaerobic grain sludge, and stirring and recording methane content after 8 days is 7.1L.
Embodiment 4
4L mud is joined in the reactor of 6L, stir 8d under the condition of 21 ℃ of pH10, temperature, the concentration that records short chain fatty acid is 2957mg/L.Temperature with reactor is controlled at 35 ℃ then, and the pH of mixture is adjusted to 7, inoculates 0.5L (12.5%) anaerobic grain sludge, and stirring and recording methane content after 6 days is 18.6L.
Embodiment 5
4L mud is joined in the reactor of 6L, stir 8d under the condition of 21 ℃ of pH10, temperature, the concentration that records short chain fatty acid is 2957mg/L.Temperature with reactor is controlled at 35 ℃ then, and the pH of mixture is adjusted to 7, inoculates 0.5L (12.5%) anaerobic grain sludge, and stirring and recording methane content after 8 days is 24.7L.
Embodiment 6
4L mud is joined in the reactor of 6L, stir 8d under the condition of 21 ℃ of pH10, temperature, the concentration that records short chain fatty acid is 2957mg/L.Temperature with reactor is controlled at 35 ℃ then, and the pH of mixture is adjusted to 7, inoculates 0.5L (12.5%) anaerobic grain sludge, and stirring and recording methane content after 14 days is 24.7L.
Embodiment 7
4L mud is joined in the reactor of 6L, stir 8d under the condition of 21 ℃ of pH10, temperature, the concentration that records short chain fatty acid is 2957mg/L.Temperature with reactor is controlled at 35 ℃ then, and the pH of mixture is adjusted to 7, inoculates 0.32L (8%) anaerobic grain sludge, and stirring and recording methane content after 8 days is 21.3L.
Embodiment 8
4L mud is joined in the reactor of 6L, stir 8d under the condition of 21 ℃ of pH10, temperature, the concentration that records short chain fatty acid is 2957mg/L.Temperature with reactor is controlled at 35 ℃ then, and the pH of mixture is adjusted to 7, inoculates 0.6L (15%) anaerobic grain sludge, and stirring and recording methane content after 8 days is 23.5L.
Claims (9)
1, a kind of method of producing methane by sludge is characterized in that, may further comprise the steps:
With mud anaerobically fermenting 4～12 days under alkaline condition, with hydrolyzing sludge, and with this sludge hydrolytic liquid acidifying;
The pH value of fermenting mixture is adjusted to neutrality, and to add volume percent be 8～15% anaerobic grain sludge, continue anaerobically fermentings down at 30 ℃～40 ℃ and produced methane in 6～14 days.
2, the method for producing methane by sludge according to claim 1 is characterized in that, the pH value of described alkaline condition is 8～10.
3, the method for producing methane by sludge according to claim 2 is characterized in that, the pH value of described alkaline condition is 10.
4, according to the method for each described producing methane by sludge in the claim 1 to 3, it is characterized in that described mud anaerobically fermenting 8 days under alkaline condition.
5, the method for producing methane by sludge according to claim 1 is characterized in that, the volume percent that described anaerobic grain sludge adds is 12.5%.
6, the method for producing methane by sludge according to claim 1 is characterized in that, the temperature of described continuation anaerobically fermenting is 35 ℃.
According to the method for claim 1,5 or 6 described producing methane by sludge, it is characterized in that 7, the time of described continuation anaerobically fermenting is 8 days.
8, the method for producing methane by sludge according to claim 1 is characterized in that, in anaerobic fermentation process, fermenting mixture is stirred, and the speed of this stirring is 40～100 rev/mins.
9, the method for producing methane by sludge according to claim 8 is characterized in that, the speed of described stirring is 80 rev/mins.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101953028A CN101654322B (en) | 2009-09-08 | 2009-09-08 | Method for producing methane by sludge |
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| CN2009101953028A CN101654322B (en) | 2009-09-08 | 2009-09-08 | Method for producing methane by sludge |
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| CN101654322A true CN101654322A (en) | 2010-02-24 |
| CN101654322B CN101654322B (en) | 2011-06-22 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921049A (en) * | 2010-09-21 | 2010-12-22 | 同济大学 | Method and device for producing methane by using dry anaerobic digestion for urban sludge and organic matter |
| CN101935139A (en) * | 2010-09-21 | 2011-01-05 | 同济大学 | Method for producing mash gas from municipal sludge through dry method anaerobic fermentation |
| CN103172242A (en) * | 2013-03-04 | 2013-06-26 | 同济大学 | Method for improving methanogenesis of residual sludge by heat and alkali combined pretreatment |
| CN103204616A (en) * | 2013-03-14 | 2013-07-17 | 同济大学 | Method for increasing residual sludge methane yield of sewage treatment plant |
| CN103992015A (en) * | 2014-05-29 | 2014-08-20 | 郑州大学 | Process for improving dewaterability of excess biochemical sludge |
| CN106587558A (en) * | 2016-12-26 | 2017-04-26 | 同济大学 | Method for promoting anaerobic digestion of high solid sludge to produce methane and reducing hydrogen sulfide content by alkaline fermentation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303012C (en) * | 2004-02-04 | 2007-03-07 | 同济大学 | Digesting treatment method for city domestic refuse and sludge of sewage plant by composite anaerobe |
| CN101492696B (en) * | 2008-01-26 | 2012-11-14 | 聂艳秋 | High-efficiency method for producing hydrogen gas and methyl hydride with mix fermentation of sewage sludge and garbage |
-
2009
- 2009-09-08 CN CN2009101953028A patent/CN101654322B/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921049A (en) * | 2010-09-21 | 2010-12-22 | 同济大学 | Method and device for producing methane by using dry anaerobic digestion for urban sludge and organic matter |
| CN101935139A (en) * | 2010-09-21 | 2011-01-05 | 同济大学 | Method for producing mash gas from municipal sludge through dry method anaerobic fermentation |
| CN101935139B (en) * | 2010-09-21 | 2011-11-16 | 同济大学 | Method for producing mash gas from municipal sludge through dry method anaerobic fermentation |
| CN103172242A (en) * | 2013-03-04 | 2013-06-26 | 同济大学 | Method for improving methanogenesis of residual sludge by heat and alkali combined pretreatment |
| CN103172242B (en) * | 2013-03-04 | 2014-12-10 | 同济大学 | Method for improving methanogenesis of residual sludge by heat and alkali combined pretreatment |
| CN103204616A (en) * | 2013-03-14 | 2013-07-17 | 同济大学 | Method for increasing residual sludge methane yield of sewage treatment plant |
| CN103992015A (en) * | 2014-05-29 | 2014-08-20 | 郑州大学 | Process for improving dewaterability of excess biochemical sludge |
| CN103992015B (en) * | 2014-05-29 | 2016-02-10 | 河南君和环保科技有限公司 | A kind of technique improving biochemical excess sludge dewatering |
| CN106587558A (en) * | 2016-12-26 | 2017-04-26 | 同济大学 | Method for promoting anaerobic digestion of high solid sludge to produce methane and reducing hydrogen sulfide content by alkaline fermentation |
| CN106587558B (en) * | 2016-12-26 | 2020-06-19 | 同济大学 | Method for promoting anaerobic digestion of high-solid-content sludge to produce biogas and reducing content of hydrogen sulfide by alkaline fermentation |
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| CN101654322B (en) | 2011-06-22 |
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