Method for improving methane yield of mixed bacteria system by coupling electric signals and chemical signals

Abstract

The invention provides a method for improving the methane yield of a mixed bacteria system by coupling electric signals and chemical signals. The method comprises the following steps: domesticating a double-chamber microbial fuel cell (MFC) at an anode to obtain an electrode enriched with an electroactive biological membrane; then constructing a dual-electrode system in an anaerobic fermentation device, namely inserting a domesticated electroactive biological membrane electrode as the anode, taking an electrode without a biological membrane as a cathode, and externally applying direct-current voltage to two ends of the dual electrodes; and in an anaerobic fermentation system, directionally enriching microbial florae with different functions by adding chemical signal molecules. The method provided by the invention is used for methane production in the mixed bacteria system, can enhance information exchange among florae, is beneficial to mutualism among the florae, realizes metabolism matching of microbial action stages of fermentation acid production, hydrogen production, acetic acid production and methane production, and finally improves the methane synthesis efficiency. The method provides a new technical approach for resourceful treatment of organic wastes, and has a wide application prospect in the aspects of environmental protection and low-quality biomass utilization.

Description

technical field [0001] The invention relates to the fields of energy, environment and electrochemistry, in particular to a method for increasing methane production in a mixed bacteria system by coupling electrical signals and chemical signals. Background technique [0002] With the rapid development of economy and technology in today's society, human beings are increasingly dependent on energy, and the damage to nature is also increasing. With the gradual depletion of fossil energy and the intensification of the greenhouse effect, the impact of energy shortage and environmental pollution on the world has become increasingly prominent. Livestock and poultry manure and crop straw are two major biomass resources in my country. The annual production of livestock and poultry manure is about 2 billion tons (wet weight), and the output of crop straw can reach more than 800 million tons. The resources are abundant and widely distributed. However, if it is not used effectively, it w...

AI Technical Summary

Problems solved by technology

Because there are many bacterial groups involved in the reaction process, different bacterial groups are interdependent and mutually restrictive, forming a complex interaction network, and there are many biochemical reactions in the anaerobic digestion process, involving solid, liquid and gas multiphase, The metabolic process is complex, and mass and heat transfer are difficult, so the substrate utilization rate is low, and the methane synthesis efficiency has not been high

At present, most studies are devoted to improving the anaerobic digestion methane production by optimizing the operating conditions of the anaerobic fermentation system, adding functional material mediation and bioaugmentation, etc., but the effect is not obvious, and the organic A series of key problems such as low substrate degradation utilization rate, long start-up cycle, and inappropriate bacterial metabolism

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