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Method for producing methane by two-phase multi-stage anaerobic fermentation of organic solid wastes

An organic solid, anaerobic fermentation technology, applied in fermentation, waste fuel, biosynthesis, etc., can solve the problems of continuous and stable operation, low pollution load, unstable biogas production, etc., and achieve stable, stable and efficient production Gas, the effect of improving the reaction efficiency

Active Publication Date: 2009-10-28
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

However, the above-mentioned two-phase anaerobic digestion system is carried out in batch mode, the overall pollution load of the system is still low, and the biogas production is unstable, so continuous and stable operation cannot be achieved

Method used

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Embodiment

[0021] The two-phase multistage anaerobic fermentation system includes three 1L acidification reactors, one 0.5L leachate collection tank, and one 2L methanation reactor.

[0022] 1) Load 1000g of kitchen waste with a volatile solid (VolatileSolid, VS) content of 20% in three acidification reactors in sequence, fill with anaerobic activated sludge, control the pH value at 6.0, and carry out at 55°C Hydrolysis acidification reaction, collecting the generated gas, the specific feeding method is: on the 0th day, put the material into the first acidification reactor for reaction; on the third day, put the material into the second acidification reactor for reaction; On the 6th day, the material was loaded into the 3rd reactor to react; on the 9th day, the remaining solid in the 1st acidification reactor was taken out (the liquid part remained in the reactor), and an equal amount of New material; After the 2nd acidification reactor reacted 9 days, take out remaining solid (retain li...

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Abstract

The invention provides a method for producing methane by two-phase multi-stage anaerobic fermentation of organic solid wastes and belongs to the field of the treatment of organic solid wastes, namely the field of renewable energy resources. The prior art has the problems that the yield of the methane is unstable, and the continuous operation can not be achieved. The method comprises the following steps that: the organic solid wastes are put in n(n is more than or equal to 2) acidification reactors in parallel connection and subjected to hydrolytic acidification at a pH value of between 5.8 and 6.5 and a temperature of between 50 and 55 DEG C, and the materials in each hydrolytic acidification reactor are changed after the materials are reacted for n*m(m is more than or equal to 1) days; the percolate generated due to acidification is collected, the pH value of the percolate is adjusted to be between 7.0 and 8.0, the percolate is pumped into a methane reactor filled with inoculation sludge in a mode of batch feeding, and the generated gas is collected at the pH value of between 7.0 and 8.0 and at a temperature of between 50 and 55 DEG C; and finally, the water discharged from the methane reactor is pumped into the acidification reactors. The method has the advantages of high gas-producing efficiency, short period, the realization of stable and continuous gas production, no emission of waste water, and the like.

Description

technical field [0001] The invention belongs to the field of organic solid waste treatment and renewable energy. It specifically relates to a method for producing biogas by anaerobic digestion of organic solid waste, and in particular to a method for producing biogas by using a two-phase (methanogenic phase and acid-producing phase) multistage anaerobic fermentation system to process organic solid waste. Background technique [0002] Organic solid waste (including livestock and poultry manure, municipal solid waste, and crop straw) is a renewable resource. If it cannot be effectively treated, it will cause serious environmental pollution. Using anaerobic fermentation to treat it can not only eliminate environmental pollution, but also convert these waste resources into clean energy biogas. The traditional single-phase batch anaerobic digestion is mainly suitable for the treatment of liquid waste, which has low pollution load bearing capacity and a large amount of wastewater...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30Y02P20/59
Inventor 刘广青李秀金董仁杰肖勇魏泉源
Owner BEIJING UNIV OF CHEM TECH
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