A method for generating electricity and decontaminating using a self-breathing microbial fuel cell

Abstract

The invention relates to a method of generating power and removing pollution by using a self-breathing microbial fuel cell. Pretreatment sewage flows into an anode chamber through a water inlet; organic matter in the water generates electrons and protons due to a synergistic effect of suspended microorganisms and anode surface attached microorganisms in the anode chamber; the proton are migrated to a cathode via a proton exchange membrane; the electrons reach a cathode via an external circuit; the self-breathing cathode gives a triphase reduction reaction by taking oxygen as an electron acceptor to form a complete current loop; a fuel cell device generates electric energy to drive an external load and an engine to operate during sewage treatment; the engine drives a worm transmission mechanism to allow the anode to rotate axially to promote electron transfer and uniform microorganism distribution in the anode chamber; the treated sewage or waste is discharged through a water outlet; and the sewage in the anode chamber is replaced periodically. The method has the advantages that the array distribution anode is matched with the self-breathing cathode; bacterium attachment is promoted; internal resistance of the battery is greatly reduced; the sewage is purified; and the power is generated at the same time.

Description

technical field [0001] The invention belongs to the application field of the microbial fuel cell, and particularly relates to a method for generating electricity and decontamination by using a self-breathing microbial fuel cell. Background technique [0002] A microbial fuel cell is a device that directly converts chemical energy in organic matter into electrical energy by means of a variety of microorganisms. Compared with traditional fuel cells, microbial fuel cells use microorganisms instead of expensive chemical catalysts, and can purify sewage while generating energy, with great development prospects. A microbial fuel cell is mainly composed of an anode chamber, a cathode chamber and a diaphragm in the middle (mostly a proton exchange membrane). The basic working principle of microbial fuel cells is: in an anaerobic environment, microorganisms suspended in the anode chamber decompose complex macromolecular organic matter into small molecular organic matter, and the mic...

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Problems solved by technology

[0003] However, the production capacity of microbial fuel cells is low at this stage, which is not enough for practical application and promotion

Although with the continuous improvement of microbial fuel cell electrode and reactor configuration, its monomer energy density has increased rapidly, but there are still the following problems: the specific surface area of ​​the anode electrode is small, which is not conducive to the attachment and growth of microorganisms; magnetic stirring is often used in laboratories The device improves battery performance, but this undoubtedly increases energy consumption, and it is impossible to add a magnetic stirring device in practical applications; more aeration in the cathode chamber promotes the reduction reaction, but increases the cost; the cost of the proton exchange membrane is too high, and it is easy to increase the internal resistance of the battery ;The battery mostly works intermittently, and the waste water needs to be replaced periodically, which is not conducive to practical application; The structure of the new battery reactor is complicated and most of them cannot be expanded

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