Biological cathode electrochemical system for processing low C/N (carbon/nitrogen) ratio waste water, and method for processing waste water thereof

Abstract

The invention belongs to the technical fields of microbial fuel cells and water treatment, and provides a biological cathode electrochemical system for processing low C / N (carbon / nitrogen) ratio wastewater, and a method for processing waste water thereof in order to solve the problem that a cathode nitrate nitrogen removal rate is low and output voltage is low when the biological cathode of the traditional microbial fuel cell is at a low C / N ratio. The electrodes of a cathode chamber and an anode chamber are carbon brushes; escherichia coli is inoculated in the anode chamber; Acinetobacter sp.Y1 is inoculated in the cathode chamber; the cathode chamber and the anode chamber are respectively provided with a saturated calomel reference electrode; an anode conduction electrode and a cathodeconduction electrode are connected through an external resistor to form an integral circuit; the external resistor is connected with a voltage data collector in parallel. According to a reactor anodeconstructed by the invention, organic matters are consumed, decarburization is carried out for providing electrons, meanwhile, amine salt generates nitratlon reaction, and the cathode generates denitrification reaction. An experiment proves that the biological cathode BES (Bioelectrochemical system) can realize the effects of synchronous nitrification and denitrification as well as decarburizationand electricity generation.

Description

technical field [0001] The invention belongs to the technical field of microbial fuel cells and water treatment, and specifically relates to a biological cathode electrochemical system for treating low C / N ratio sewage wastewater and a method for treating wastewater, using heterotrophic nitrifying-aerobic denitrifying bacteria Acinetobacter sp. Y1 was used as a biocathode to inoculate the strain, and the cathode chamber was added with nitrate-nitrogen-containing salt wastewater to construct a biocathode microbial fuel cell for denitrification, and a potentiostat was used to control the cathode potential to achieve high-efficiency denitrification under low C / N ratio conditions. Background technique [0002] Heterotrophic nitrification-aerobic denitrification bacteria have the advantages of fast reproduction rate, simultaneous decarbonization and nitrogen removal, simultaneous nitrification and denitrification, no need for additional carbon source, strong adaptability, etc., ...

AI Technical Summary

Problems solved by technology

In recent years, there have been many studies on the use of mixed-bacteria biocathode MFC for cathode denitrification. Although high denitrification efficiency and power output can be obtained, there are problems of low electron transfer efficiency and unclear mechanism of electricity production process.

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