Bioelectrochemical reaction device and bioelectrochemical reaction method for producing methane on basis of reinforcement of high-organic-matter and high-ammonia-nitrogen wastewater

Abstract

The invention discloses a bioelectrochemical reaction device and a bioelectrochemical reaction method for producing methane on the basis of the reinforcement of high-organic-matter and high-ammonia-nitrogen wastewater. The device comprises an electrochemical reaction tank provided with cation exchange membranes, wherein the electrochemical reaction tank is divided into first chambers provided with anodes and second chambers provided with cathodes by the cation exchange membranes. The device further comprises an ammonia gas absorption chamber, wherein the first chambers and the second chambers are communicated to the ammonia gas absorption chamber through gas guide tubes respectively; a biological anode and a biological cathode are further arranged in each first chamber. NH4<+1> and H<+1> in the wastewater are migrated into the second chambers by virtue of the cation exchange membranes, thus eliminating the toxic actions of high-concentration ammonia nitrogen on anaerobic microorganisms; the hydrogen generated by the second chambers is charged in the first chambers to provide enough hydrogen to hydrogen-philic methanogens in the first chambers, thus furthest reducing CO2 to methane; 2+N (the number of the second chambers) biological electrodes are contained in the first chambers, thus effectively improving the degradation actions of the electrodes on organic matters, and increasing the yield of methane.

Description

technical field [0001] The invention belongs to the field of wastewater treatment technology and bioenergy, and in particular relates to a bioelectrochemical reaction device and method for enhancing methane production by using wastewater with high organic matter and high ammonia nitrogen. Background technique [0002] During anaerobic fermentation, organic matter is hydrolyzed by anaerobic microbial extracellular enzymes to produce amino acids, fatty acids, and glycerol. The hydrolyzate is then converted into acetic acid and hydrogen under the action of hydrogen-producing acetogenic bacteria. Finally, hydrogenophilic methanogens can convert CO 2 and H 2 Converted to methane, acetophilic methanogens, etc. can decompose acetic acid to produce methane. In the process of methanogenesis, the change of pH has an important impact on methanogens, and it is very necessary to maintain an alkaline environment. However, free ammonia in excessively high concentrations of ammonia nitr...

AI Technical Summary

Problems solved by technology

[0004] The Chinese invention patent application with the publication number CN102925492A discloses a method for producing methane and acetic acid by reducing carbon dioxide using a bioelectrochemical system. In this method, CO is introduced into the cathode chamber and the anode chamber. 2 Cycle aeration, set the cathode polarization potential -1.05~-1.35V (vs. SHE), use the microorganisms on the cathode to obtain electrons directly from the electrode or the hydrogen generated by the electrode to reduce carbon dioxide to produce methane, the methane process produced by this method Acetic acid will be produced in the water, and the acetic acid produced is not further utilized, so the efficiency of methane production is low, and the poisonous effect of high-concentration ammonia nitrogen wastewater on anaerobic microorganisms cannot be eliminated

Images