System for removing nitrate nitrogen in water in electro-catalysis mode through coupling biology positive electrode

Abstract

The invention discloses a system for removing nitrate nitrogen in water in an electro-catalysis mode through a coupling biology positive electrode, and belongs to the technical field of water quality purification and energy recycling. The system is characterized in that tetrabutyl titanate and a metal salt solution are hydrolyzed into gel under the acidic condition, a carbon fiber sheet basement is coated with the gel, and the metal-doping TiO2 gel electrode is obtained with a roasting method. Electrons and protons which are generated when current-producing bacteria in the biology positive electrode degrade organic pollutants are used for a negative electrode to reduce the nitrate nitrogen in the electro-catalysis mode, and the nitrate nitrogen is reduced into nitrogen to be removed from a water body without any additional substance and energy consumption. The system has the advantages that the cost of a cathode catalyst is reduced, the electrons and the protons which are generated when the current-producing microorganisms of the biology positive electrode degrade the organic pollutants are used for the reduction reaction of the negative electrode, an additional power source is avoided in the reaction, no additional substance needs to be added into the reaction system, cost is saved, and the aims of saving energy and protecting the environment are achieved.

Description

technical field [0001] The invention belongs to the technical field of water quality purification and energy recovery and utilization, and relates to the conversion of chemical energy in sewage into electrical energy by microorganisms, the preparation of cathode electrocatalytic catalysts, the loading of catalysts on carbon fiber cloth substrates, and the construction of a double-chamber electrochemical system. It particularly relates to the reduction of nitrate nitrogen in water to nitrogen gas by using electrons and proton hydrogen produced by microorganisms under the action of catalytic electrodes. Background technique [0002] In recent years, nitrate pollution in global water bodies has become increasingly serious. The electrocatalytic method is safe, easy to operate, and does not require the addition of other chemicals. It is an environmentally friendly method for degrading pollutants and has received widespread attention. However, the electrocatalytic process needs to...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a system for electrocatalytic removal of nitrate nitrogen in water coupled with biological anodes, which solves the problems of high catalyst cost, additional power supply and hydrogen protons, many by-products and poor nitrogen selectivity in the process of electrocatalytic reduction of nitrate nitrogen question

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