Rotating biological-cathode microbiological fuel cell and sewage treatment method thereof

Abstract

The invention relates to a rotating biological-cathode microbiological fuel cell and a sewage treatment method thereof, and belongs to the technical field of sewage treatment and resource recycling in environment engineering. The invention is characterized in that a cathode is made of carbon fibers and fixed to a circular ring. The outer layer of the rotating cathode biomembrane mainly comprises aerobic nitrifiers for completing the short-range nitrification of ammonia nitrogen. In the inner layer of the cathode biomembrane, nitrite nitrogen and nitrate nitrogen are used as electron acceptors, an electrode is an electron donor and used for denitrification. The structure of a reactor realizes controllable rotation speed of the cathode, controllable distance between the cathode and the anode, and controllable submerging proportion of the cathode biomembrane, and has the advantages of flexible operation, and convenient regulation and control. The rotating biological-cathode microbiological fuel cell can realize control on dissolved oxygen in a single-chamber reactor; and thus, the invention reduces the internal resistance of the cell, accelerates the biomembrane renewing, realizes the short-range nitrification and denitrification, synchronously completes decarburization and denitrification with low consumption and high efficiency, and extracts chemical energy from pollutants to form electric energy output.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to sewage treatment and reclaimed water reuse technology, in particular to a sewage treatment method for synchronously removing carbon and denitrification while using a rotating biocathode microbial fuel cell to generate electricity. Background technique [0002] Human survival and activities are inseparable from water. my country's Northwest, North China and coastal water-deficient areas are affected by the lack of water resources, and the development of the national economy is severely restricted. At present, the carbon content of urban sewage is not high, and sewage with high nitrogen / carbon ratio is common, and the removal of nitrogen pollutants has become a focus of attention. In addition, worldwide, the demand for energy is increasing exponentially, but at present, the supply of energy still mainly depends on the combustion of fossil fuels, and the fossil fuels...

AI Technical Summary

Problems solved by technology

The air cathode microbial fuel cell directly takes the oxygen in the air to participate in the reaction, which solves the problem of solubility, and at the same time uses the noble metal platinum-modified cathode to catalyze the reaction, thereby obtaining higher power output; but it increases the production cost, and Because the activities of microorganisms are easy to be poisoned, the catalytic efficiency decreases, which does not meet the needs of practical applications

Potassium ferricyanide and potassium permanganate and other cathode systems, although they have high solubility, do not have the problem of mass transfer like oxygen, and can obtain a high potential at the same time, but the cost is high, and there is a problem of reuse, causing secondary pollution

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