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

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...

AI Technical Summary

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 for in China, it is reported that the use of anaerobic activated sludge (Chinese patent application 92114474.1) is used to produce hydrogen by fermentation of organic wastewater. Oxygen-activated sludge contains a large number of anaerobic bacteria such as methanogens and hydrochloride-reducing bacteria. These bacteria can use hydrogen to survive, so the total amount and recovery of hydrogen have a certain impact; and a biological hydrogen production fermentation Liquid (Chinese patent application 00105462.7) preparation method, its hydrolysis preparation culture liquid needs 1~4 months, prepares fermented liquid also needs 1~4 months at the same time, the required preparation time is longer

The above-mentioned disclosed relevant patents all only obtain H by fermentation. 2 As the target product, the low energy conversion rate of pure hydrogen production is a major problem at present.

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