Anaerobic ammonia oxidation microbiological fuel cell

Abstract

The invention discloses an anaerobic ammonia oxidation microbiological fuel cell, which consists of a constant temperature stirring system, a reaction system and a data acquisition monitoring system, wherein the constant temperature stirring system is provided with a constant temperature magnetic stirrer body and a magnetic stirring bar; the reaction system is provided with a cylindrical reactor body and a sealing cover; the lower and upper parts of the cylindrical reactor body are provided with a water inlet pipe and a water outlet pipe respectively; an electricity generation matrix is arranged in the cylindrical reactor body; anaerobic ammonia oxidation bacteria and a film-formed anode and a film-formed cathode to which the anaerobic ammonia oxidation bacteria is attached are immersed in the electricity generation matrix; the upper part of the sealing cover is provided with an anode wire fixing tube, a cathode wire fixing tube, a sampling tube and a reference electrode fixing tube; a seal ring is arranged between and connected by flanges with the cylindrical reactor body and the sealing cover; and the data acquisition monitoring system is provided with a load, a wire, a data acquisition device and an on-line computer. The device of the invention has the advantages of simple structure, low manufacturing cost, small internal resistance, efficient and stable performance and capability of realizing synchronous wastewater denitrification and biological electricity generation.

Description

technical field [0001] The invention relates to a biological fuel cell, in particular to an anaerobic ammonium oxidation microbial fuel cell. Background technique [0002] Microbial Fuel Cells (MFC for short) is a device that uses microorganisms as an anode catalyst to directly convert chemical energy into electrical energy. The use of microbial fuel cells not only directly degrades organic matter in water or sludge, but also converts electrons generated during the metabolism of organic matter into electric current to obtain electrical energy. In recent years, under the dual pressure of environmental pollution and energy crisis, because microbial fuel cells can treat wastewater and generate electricity at the same time, this new technology has become more and more popular, and has become a research hotspot in the field of wastewater treatment and new energy development. [0003] The working principle of microbial fuel cells is as follows: under the action of microorganisms ...

AI Technical Summary

Problems solved by technology

These microbial fuel cells have the following disadvantages: (1) Among the found facultative anaerobic electrogenic bacteria, except Shewanella putrefaciens, Geobacteraceae, and Rhodoferax ferrireducens Except for several kinds of bacteria, the electron transfer efficiency of other electrogenic bacteria is very low, and additional electron mediators such as neutral red and 2,6-anthraquinone need to be added to enhance electron transfer. Most of the mediators are toxic and expensive

(2) The dual-chamber microbial fuel cell is divided into cathode and anode chambers by the proton exchange membrane. Membrane is expensive (4000-12000 RMB / m 2 ); the electrons transferred to the cathode need to be combined with an external electron acceptor. There are two supply methods for the electron acceptor. One way is to use chemical substances with high oxidation activity such as ferricyanide and permanganate. A noble metal catalyst is loaded on the cathode, but the cost is high, regeneration is difficult, and it is easy to cause secondary pollution. Another way is to use air as an electron acceptor. Although air is cheap and easy to obtain, its redox rate is low, and it is necessary to load platinum on the cathode. noble metal catalyst

(3) The single-chamber microbial fuel cell does not have a cathode chamber, but still needs a proton exchange membrane, and its cathode also needs to be loaded with noble metal catalysts and requires complex waterproofing treatment

(4) The electricity generation matrix is ​​organic matter, with low conductivity, high internal resistance of the battery, and low electricity generation efficiency. Sometimes it is necessary to add additional inorganic ions to enhance its conductivity

Low power generation efficiency and high cost have become two bottlenecks restricting the development and application of existing microbial fuel cells

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