Method for producing methane by synergistic treatment of biogas slurry and biogas based on microbial electrocatalysis

Abstract

A method for biogas slurry advanced treatment and biogas upgrading to prepare methane based on microbial electrocatalysis. The biogas slurry is used to start the microbial electrochemical system, and the volatile fatty acids and refractory organic compounds in the biogas slurry are degraded under the action of anode electroactive microorganisms. And cooperating with sulfur-oxidizing microorganisms to oxidize hydrogen sulfide in raw biogas to polysulfides, while polysulfides act as redox shuttles to transfer electrons and protons generated at the anode to the cathode, and reduce them in the crude biogas under the action of methanogenic microorganisms at the cathode The carbon dioxide is methane, which realizes the simultaneous completion of advanced treatment of high-concentration biogas slurry, desulfurization and decarbonization of biogas.

Description

Method for preparing methane by co-processing of biogas slurry and biogas based on microbial electrocatalysis technical field The invention belongs to the field of green energy, be specifically related to a kind of based on microbial electrocatalysis principle, synchronously realize biogas Method for preparing methane by liquid treatment and biogas upgrading. Background technique At present, the output and quantity of biogas projects in our country rank first in the world, and more than 90% of them adopt wet anaerobic digestion. It is the mainstream process of green energy conversion of organic waste. However, the energy conversion efficiency of the existing wet anaerobic digestion process is low, A large amount of biogas slurry produced by fermentation is difficult to be absorbed by land, and most of them are treated as leachate, which has complicated treatment process and high cost; The methane content of the biogas is only 50%-70%, carbon dioxide is as high as 25...

AI Technical Summary

Problems solved by technology

At present, the relatively mature biogas upgrading methods mainly include physical, chemical and biological technologies, which are mainly suitable for large-scale biogas projects. For decentralized, medium and small-scale biogas projects, the economy and feasibility are not high, and the purification process will produce secondary products such as by-products. Pollution, which increases process complexity, leads to high investment and operating costs, and seriously affects biogas applications

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