Method for deep denitrification of low carbon source urban sewage

Abstract

The invention relates to a method for deep denitrification of low carbon source urban sewage and belongs to the technical field of biological sewage treatment. Urban sewage and refluent nitrification liquid enter a short-range denitrification anaerobic ammonium oxidation area of a deep denitrification bioreactor, denitrifying bacteria on a biofilm outer layer reduce nitrate nitrogen in the refluent nitrification liquid into nitrite by utilizing a limited organic carbon source in raw water, and anaerobic ammonium oxidizing bacteria on a biofilm inner layer enable the generated nitrite nitrogen and ammonia nitrogen in part of raw water to react and be converted into nitrogen; the sewage enters an aerobic area to be subject to short-range nitration, so that the remaining part of ammonia nitrogen of the sewage is converted into nitrite nitrogen; then the sewage enters the anaerobic ammonium oxidation area, enters the aerobic area and the anaerobic ammonium oxidation area, and finally enters a nitrification area, so that the nitrate nitrogen and the ammonia nitrogen in the raw water are oxidized to be nitrate nitrogen. According to the method, through the united application of short-range denitrification-anaerobic ammonia oxidation and short-range nitrification-anaerobic ammonia oxidation, the deep denitrification of the low carbon source urban sewage is performed.

Description

technical field [0001] The invention relates to a deep biological denitrification method for realizing low-carbon source urban sewage short-range denitrification-anaerobic ammonium oxidation based on digesting sludge dehydration liquid to treat sludge, and belongs to the technical field of sewage biological treatment. Background technique [0002] Traditional biological denitrification technology is limited by insufficient carbon sources in domestic sewage, so urban domestic sewage cannot be efficiently denitrified, and it is difficult to meet the national Class A discharge standard. [0003] Compared with the traditional nitrification and denitrification technology, the anaerobic ammonia oxidation technology is an autotrophic denitrification process with low oxygen demand. In the reaction process, carbon dioxide is used as the only carbon source without adding organic carbon sources. Low, suitable for the treatment of low C / N ratio sewage. [0004] The short-cut nitrificat...

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Problems solved by technology

[0004] The short-cut nitrification-anammox process developed in recent years has been successfully applied to the treatment of high ammonia nitrogen wastewater, but it has not been applied to the treatment of urban domestic sewage. The substrate matrix nitrite is difficult to obtain stably, and the ammonia nitrogen in the sewage is oxidized to nitrite by ammonia oxidizing bacteria, while preventing nitrite from being further oxidized to nitrate by nitrite oxidizing bacteria

Realizing short-cut nitrification is the key to obtaining nitrite, but it is still difficult to maintain short-cut nitrification stably in urban domestic sewage with low C / N ratio, which limits short-cut nitrification

[0005] However, there are certain by-products in the anaerobic ammonium oxidation reaction, and the anaerobic ammonium oxidation reaction will bring 11% of nitrate nitrogen,

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