Device and method for integrated synchronous short-range nitrification and anammox combined with short-range denitrification to treat urban domestic sewage with low carbon-to-nitrogen ratio

Abstract

An integrated synchronous short-range nitrification anaerobic ammonium oxidation coupled short-range denitrification device and method for treating urban sewage with a low carbon-to-nitrogen ratio belongs to the technical field of sewage biological treatment. The device includes an urban sewage raw water tank, an SBR reactor, a blower aerator, and a water outlet tank. At the beginning of the reaction, the domestic sewage enters the SBR reactor first, and the denitrifying bacteria use the carbon source in the domestic sewage to reduce the remaining NO in the previous cycle. 3 ‑ Short-cut denitrification produces NO 2 ‑ ‑N Sync with NH 4 + ‑N is removed by anaerobic ammonium oxidation, and the remaining organic matter is stored by denitrifying bacteria to synthesize PHA in the body. After the reaction, low-oxygen aeration is performed, and an integrated anaerobic ammonium oxidation reaction is carried out on the biofilm to remove NH 4 + ‑N, generating a small amount of NO 3 ‑ ‑N, and then stirred, the denitrifying bacteria use the stored PHA for endogenous denitrification. The invention achieves NO in the form of short-cut nitrification and short-cut denitrification 2 ‑ Accumulation, efficient removal of N and COD in urban sewage, full use of organic matter in domestic sewage, no need for external carbon sources, saving aeration energy consumption, and achieving deep denitrification.

Description

technical field [0001] The invention relates to an integrated synchronous short-range nitrification anaerobic ammonium oxidation coupled short-range denitrification device and method for treating urban domestic sewage with a low carbon-to-nitrogen ratio, and belongs to the technical field of sewage biological treatment. Background technique [0002] With the continuous improvement of people's living standards, more and more water bodies have become eutrophic, including the familiar Dian Lake and Tai Lake, etc., and with the shortage of water resources, the problem of water eutrophication has received more and more attention Among them, the denitrification problem has become a difficult point, especially the country has issued a new first-class A effluent standard. The traditional biological denitrification process has high aeration, the need to add additional organic carbon sources, high infrastructure investment, and process control. Complexity and other issues, so it is di...

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Problems solved by technology

[0002] With the continuous improvement of people's living standards, more and more water bodies have become eutrophic, including the familiar Dian Lake and Tai Lake, etc., and with the shortage of water resources, the problem of water eutrophication has received more and more attention Among them, the denitrification problem has become a difficult point, especially the country has issued a new first-class A effluent standard. The traditional biological denitrification process has high aeration, the need to add additional organic carbon sources, high infrastructure investment, and process control. complexity, etc., making it difficult to meet existing requirements

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