Method for producing hydrogen by coupling fermentation and photosynthesis of biomass and solid organic wastes

Abstract

The present invention relates to hydrogen producing method, and especially method of producing hydrogen with biomass and solid organic waste and through fermentation and photosynthesis coupling. 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 inoculating photosynthesis hydrogenogen to convert the small molecular weight side products into hydrogen. The apparatus can treat waste effectively to produce clean energy source material, and has high hydrogen output, high energy source converting rate, high matrix utilizing rate and low hydrogen producing cost.

Description

technical field [0001] The invention relates to a method for producing hydrogen, more specifically, the invention relates to a method for producing hydrogen by fermenting and photosynthetically coupling biomass and solid organic waste. Background technique [0002] my country is very rich in biomass resources. The total amount of various major crops (rice stalks, wheat stalks, corn stalks, etc.) is 705 million tons, and agricultural processing waste (rice husks, bagasse, etc.) is about 84 million tons. The reasonable resources of forestry processing residues are 158 million tons, the total amount of human and livestock manure biomass resources is 443 million tons, and the organic matter in urban domestic garbage sewage is about 56 million tons. The potential of my country's biomass resources is equivalent to about 700 million tons of standard coal, but the current actual use is about 220 million tons of standard coal, so there is still great potential for development. At pre...

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Problems solved by technology

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 simple fermentation hydrogen production is a major problem at present.

[0005] Using biomass and solid organic waste as the nutrient matrix for microbial fermentation reactions can generate H 2 , CO 2 , acetic acid, propionic acid and other organic acid alcohols, but fermentative bacteria are thermodynamically unable to completely degrade these small molecule organic acids to produce hydrogen

Even if the simplest glucose is used as the substrate to ferment hydrogen, in the absence of external supplementary energy, small molecular organic acids such as butyric acid, propionic acid, and acetic acid will still remain, resulting in a lower energy conversion rate of simple fermentative hydrogen production. 33.5% are not economically competitive

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