Device and method using integrated synchronous shortcut nitrification anammox coupling with shortcut denitrification to treat low-carbon-nitrogen-ratio city domestic sewage

Abstract

The invention relates to a device and method using integrated synchronous shortcut nitrification anammox coupling with shortcut denitrification to treat low-carbon-nitrogen-ratio city domestic sewageand belongs to the technical field of biological sewage treatment. The device comprises a raw city sewage tank, an SBR reactor, a blast aerator and a water discharge tank. At the beginning of reaction, the domestic sewage enters the SBR reactor, denitrifying bacteria use the carbon source in the domestic sewage to perform shortcut denitrification on residual NO3<-> of the previous cycle, the generated NO2<->-N and NH4<+>-N are synchronously removed through an anammox effect, residual organic matter is stored in the bodies of the denitrifying bacteria to synthesize PHA, low-oxygen aeration is performed after the reaction, integrated anammox reaction is performed on a biological membrane to remove NH4<+>-N and generate NO3<->-N, then stirring is performed, and the denitrifying bacteria use the PHA stored in the bodies to perform endogenous denitrification. The device and method has the advantages that NO2<-> accumulation is achieved in the form of shortcut nitrification and shortcut denitrification, N and COD of city sewage can be removed efficiently, the organic matter in the domestic sewage is sufficiently utilized, an external carbon source is not needed, aeration energy consumption is reduced, and deep denitrification is achieved.

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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