Method for methane production and efficient deep denitrification of urban sewage

Abstract

The invention discloses a method for methane production and efficient deep denitrification of urban sewage, and belongs to the technical field of biological treatment of sewage. Municipal sewage firstenters an anaerobic membrane bioreactor, granular sludge converts organic matters in the sewage into methane, and the sludge and dissolved methane are intercepted by a membrane module, so that the collection rate of methane gas is improved, and the dissolved methane in the effluent is reduced as a greenhouse gas for release; the effluent enters a short-range denitrification coupled anaerobic ammonia oxidation reactor together with nitrifying liquid refluxed from a nitrification reactor, and the granular sludge reduces nitrate nitrogen to nitrite nitrogen, and converts the nitrite nitrogen andpart of ammonia nitrogen into nitrogen; next, the effluent enters a short-range nitrification anaerobic ammonia oxidation reactor, and the granular sludge converts part of the ammonia nitrogen into nitrite nitrogen, and then converts the nitrite nitrogen and part of the ammonia nitrogen into nitrogen; the sewage finally enters the nitrification reactor, and the granular sludge oxidizes the nitrite nitrogen and the ammonia nitrogen into nitrate nitrogen, thereby achieving the purpose of deep denitrification.

Description

technical field [0001] The invention relates to a method for methane production and high-efficiency deep denitrification of urban sewage, belonging to the technical field of sewage biological treatment. Background technique [0002] In the face of increasingly stringent effluent standards, the biological denitrification technology of urban sewage plants often faces the problems of high energy consumption, high operating costs, and large footprint. At present, most urban sewage plants adopt traditional biological nitrification and denitrification denitrification technology, and additional carbon sources are required in the denitrification process. [0003] The discovery of anaerobic ammonium oxidation reaction and short-cut denitrification provides a basis for realizing low-energy, high-efficiency, deep nitrogen removal. The anaerobic ammonium oxidation reaction is a biological autotrophic denitrification. It only needs to oxidize part of the ammonia nitrogen to nitrite nitr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a method for methane production and high-efficiency deep denitrification of urban sewage for the problems of high energy consumption, high operating cost and low denitrification efficiency of urban sewage biological denitrification

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