A method of using a bioelectrochemical system to enhance denitrification of sewage and simultaneously generate electricity

Abstract

The invention discloses a method for using a bioelectrochemical system to strengthen denitrification of sewage and simultaneously generate electric energy, and relates to the fields of bioelectrochemistry and sewage treatment. The bioelectrochemical system used is a bipolar chamber configuration. The anode chamber is inoculated with mixed sludge, and sodium acetate or other organic matter is provided as a carbon source, and the electroactive biofilm is directional domesticated, wherein the carbon in the anode chamber is used as an electron donor to be absorbed Electroactive microorganisms oxidize, transfer electrons to the anode electrode, and generate current; operate the reaction device in a sequential batch or continuous flow mode, the anode chamber feed water has a carbon source and a nitrogen source, and the nitrogen source is nitrate nitrogen NO 3 ‑ ‑N, and the carbon-nitrogen ratio is greater than 0.5, and the anode chamber is an anaerobic environment, where carbon source oxidation and denitrification reactions occur; the anode potential is constant at a certain potential condition between ‑0.2V~‑0.4V vs.Ag / AgCl Below; the reaction on the cathode is any reduction reaction. The denitrification rate can reach more than 99%.

Description

technical field [0001] The invention relates to the fields of bioelectrochemistry and sewage treatment, in particular to a method for synchronously generating electric energy by strengthening decarbonization and denitrification of sewage. Background technique [0002] With the growth of population and the rapid development of economy, the discharge of wastewater in our country is increasing year by year, and the phenomenon of water pollution is becoming more and more serious, which not only causes the shortage of water resources, but also seriously threatens water security. Among them, the discharge of nitrogen-containing wastewater is one of the important causes of water environmental problems. On the one hand, nitrogen, as the main nutrient element, coexists with phosphorus in natural water bodies, which will cause eutrophication of water bodies, cause a large number of aquatic organisms to die, water quality will deteriorate, and drinking water sources will be seriously p...

AI Technical Summary

Problems solved by technology

On the one hand, nitrogen, as the main nutrient element, coexists with phosphorus in natural water bodies, which will cause eutrophication of water bodies, cause a large number of aquatic organisms to die, water quality will deteriorate, and drinking water sources will be seriously polluted; on the other hand, the existing water treatment The process cannot fully achieve denitrification, resulting in the accumulation of nitrate and nitrite in the effluent, which induces the formation of carcinogens in the water and threatens human life and health

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