Device and method for realizing deep denitrification of municipal sewage by coupling integrated short-cut nitrification-anaerobic ammonia oxidation with endogenous short-cut denitrification

Abstract

The invention discloses a device and a method for realizing deep denitrification of municipal sewage by coupling integrated short-cut nitrification and anaerobic ammonia oxidation with endogenous short-cut denitrification. The device comprises a municipal sewage raw water tank, a short-cut nitrification anaerobic ammonia oxidation coupling endogenous short-cut denitrification reactor and a water outlet tank. The method comprises the following steps: municipal sewage firstly enters a short-cut nitrification anaerobic ammonia oxidation coupling endogenous short-cut denitrification reactor, phosphorus-accumulating bacteria and denitrifying glycogen-accumulating bacteria release phosphorus while storing an internal carbon source, and the denitrifying glycogen-accumulating bacteria take in organic matters and convert the organic matters into PHAs to be stored in vivo; then low-oxygen aeration is carried out to convert part of ammonia nitrogen into nitrite nitrogen; anaerobic ammonia oxidation is performed on the residual ammonia nitrogen and the generated nitrite nitrogen to realize denitrification; and the generated nitrate nitrogen is used as an electron acceptor of denitrifying glycan-accumulating bacteria to perform endogenous short-cut denitrification, and the generated nitrite nitrogen can be continuously utilized for anaerobic ammonia oxidation. The method can stably realizelow C / N municipal sewage deep denitrification.

Description

technical field [0001] The invention relates to an integrated short-range nitrification-anammox coupled endogenous short-range denitrification process to realize deep denitrification of urban sewage, which belongs to the technical field of sewage biological treatment. Background technique [0002] At present, my country is facing a serious water resource crisis. The total amount of fresh water resources accounts for 6% of the global water resources, but the per capita water resources are only 2,300 square meters. It is one of the countries with the poorest per capita water resources in the world. The natural water cycle continues to deteriorate. The continuous improvement of social water demand and the continuous discharge of industrial wastewater have made my country's water pollution form very severe. In addition, my country has become one of the countries with serious lake eutrophication in the world. Eutrophication of water body is caused by the excessive discharge of N,...

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Problems solved by technology

[0004] The present invention proposes a device and method for integrating short-range nitrification-anammox coupled with endogenous short-range denitrification to realize the deep denitrification of urban sewage. In the denitrification process of urban sewage with low / N ratio, it solves the thorny problems of traditional processes such as high energy consumption, insufficient carbon source, and large sludge output.

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