Method for co-producing hydrogen and methane by biomass and solid organic waste fermenting method

A technology of organic waste and biomass, applied in fermentation, waste fuel, chemical recycling, etc., can solve the problems of low conversion rate of pure hydrogen production energy, low conversion rate of hydrogen production energy, and gasification rate of less than 4%. To achieve the effect of resource utilization, good economic and social benefits, and improvement of energy conversion rate

Inactive Publication Date: 2006-11-08
ZHEJIANG UNIV
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Problems solved by technology

Due to the complexity of the hydrogen production process of solid organic waste degradation, there are three major difficulties in its fermentation hydrogen production: (1) The energy conversion rate of hydrogen production is low, such as the energy conversion rate of livestock manure fermentation hydrogen production is only 40% of methane production (2) the accumulation of by-product organic acids inhibits the biodegradation process, and the acidification reaction will stop when the organic fatty acid concentration accumulates to 13000-20000 mg/L in the fermentation process of urban solid waste in the United States, and the gasification rate of solid organic matter is not yet high. to 4%; (3) For anaerobic activated sludge, it is necessary to find a method that can effectively inhibit methanogens and activate hydrogen-producing bacteria
[0005] Among the patents that have been applied

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  • Method for co-producing hydrogen and methane by biomass and solid organic waste fermenting method

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specific Embodiment 1

[0031] (1) Collect anaerobic activated sludge from urban sewage treatment plants, boil it under water-sealed conditions, inoculate it in culture medium, and acclimate it in a constant temperature incubator for 7 days to obtain a large number of fermentative hydrogen-producing bacteria as inoculum. The crushed potato is used as the fermentation base material, and it is hydrolyzed at a temperature of 35°C and a pH value of 5.0 to produce soluble sugars, amino acids and long-chain fatty acids;

[0032] (2) Acidify the mixture obtained after the above hydrolysis at a temperature of 35°C and a pH value of 5.0 to generate pyruvic acid, short-chain fatty acids and a small amount of H 2 , CO 2 ;

[0033] The hydrolysis reaction and acidification reaction of this step are carried out in same hydrolysis and acidification reactor; Reaction efficiency.

[0034] (3) Under the action of fermentative hydrogen-producing bacteria such as Clostridium butyricum, the mixture of pyruvic acid an...

specific Embodiment 2

[0039] The steps of this embodiment are the same as those in Example 1, wherein:

[0040] In step (1) the controlled temperature in the hydrolysis reaction is 30°C, and the pH value is 4.5; in the step (2) the controlled temperature in the acidification reaction is 30°C, and the pH value is 4.5; in the step (3) the controlled temperature in the hydrogen production reaction is 30°C, The pH value is 4.5; in step (4) in the methanogenic reaction, the temperature is controlled to be 30° C., and the pH is 7.0.

specific Embodiment 3

[0041] The steps of this embodiment are the same as those in Example 1, wherein:

[0042] In step (1) the controlled temperature in the hydrolysis reaction is 60°C, and the pH value is 7.0; in the step (2) the controlled temperature in the acidification reaction is 60°C, and the pH value is 7.0; in the step (3) the controlled temperature in the hydrogen production reaction is 60°C, The pH value is 7.0; in step (4) in the methanogenic reaction, the temperature is controlled to be 60° C., and the pH is 8.0.

[0043] Bacteria or strains used in the present invention are existing known strains, for example, fermenting hydrogen-producing bacteria (clostridium butyricum), methanogenic bacteria (methanosarcini), wherein fermenting hydrogen-producing bacteria (clostridium butyricum Bacteria) is a large number of bacteria carried by the anaerobic activated sludge itself. Methanosarcina is a commercially available strain. For example, Methanosarcina acetophilus produced by Soochow Unive...

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Abstract

The present invention relates to hydrogen and methane producing method and especially method of co-producing hydrogen and methane with biomass and solid organic waste and through fermentation. The method includes hydrolyzing and acidifying biomass and solid organic waste to produce pyruvic acid, short chain fatty acid and small amount of H2 and CO2; fermenting the mixture of pyruvic acid and short chain fatty acid under the action of fermenting hydrogenogen to produce great amount of hydrogen as well as small molecular weight side products ethanol, acetic acid, propionic acid and butyric acid; and further fermenting to convert the small molecular weight side products into methane under the action of methanogen. The apparatus can treat waste effectively to produce clean energy source material, and has high energy source converting rate and high matrix utilizing rate.

Description

technical field [0001] The invention relates to a method for producing hydrogen and methane, more specifically, the invention relates to a method for co-producing hydrogen and methane by using biomass and solid organic waste fermentation. Background technique [0002] Since hydrogen has a high energy density, the product of combustion is water, and it is non-polluting, it is an ideal clean energy. In the 21st century, mankind will usher in a "hydrogen energy economy". Conventional hydrogen production methods are mainly extracted from fossil fuels such as natural gas, petroleum, and coal, or produced by electrolysis of water, which consume a large amount of fossil fuels and energy, and generate a lot of pollution. At present, many countries in the world have invested heavily in the research of biological hydrogen production, which is a bioengineering technology that uses the physiological metabolism of microorganisms to decompose organic matter to generate hydrogen. It is a r...

Claims

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Application Information

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IPC IPC(8): C12P3/00C12P5/02
CPCY02E50/30Y02P20/582
Inventor 岑可法周俊虎程军刘建忠杨卫娟王智化周志军黄镇宇
Owner ZHEJIANG UNIV
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