Device and method for treating low-carbon-nitrogen-ratio wastewater by coupling continuous flow AOA short-cut nitrification and anaerobic ammonia oxidation with sludge fermentation denitrification

Abstract

The invention discloses a device and a method for treating low-carbon-nitrogen-ratio wastewater by coupling continuous flow AOA short-cut nitrification and anaerobic ammonia oxidation with sludge fermentation denitrification, and belongs to the field of biological sewage treatment. The device comprises a raw water tank, a continuous flow AOA reactor, a sedimentation tank, a sludge fermentation tank and a sludge storage tank. One part of domestic sewage enters an anaerobic section of the continuous flow reactor to store an internal carbon source and then enters an aerobic section to complete ashort-cut nitrification reaction, then effluent rich in NO2N enters an anoxic section, the other part of raw water is mixed with a returned sludge fermentation product and then enters the anoxic section, and NH4+-N and NO2--N are removed under the effect of a fixed anaerobic ammonia oxidizing bacteria filler; and NO3--N generated by anaerobic ammonia oxidation reaction is removed through denitrification, and residual sludge is fermented and then enters an intermediate sludge storage tank to be continuously added to an anoxic zone to provide a carbon source for denitrification. According to themethod, raw water and organic matters generated by sludge fermentation are fully utilized, the denitrification efficiency is improved, sludge reduction is facilitated, and deep denitrification of themunicipal domestic sewage with a low carbon-nitrogen ratio is realized.

Description

Technical field[0001]The invention relates to a device and method for continuous flow AOA short-cut nitrification and anaerobic ammonia oxidation coupled sludge fermentation and denitrification to treat low-carbon-nitrogen ratio wastewater, belonging to the field of sewage biological treatment, and suitable for deep denitrification and sludge reduction of urban domestic sewage .Background technique[0002]With social progress and the improvement of people's living standards, more and more nitrogen and phosphorus-containing wastewaters such as urban sewage and industrial wastewater generated by human activities have increased the eutrophication of water bodies and seriously harmed the ecological environment. Although the traditional nitrification and denitrification process can effectively remove part of the nitrogen and phosphorus pollutants in the sewage, it has the problems of insufficient carbon source, high energy consumption, and low denitrification efficiency. Therefore, the dev...

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Problems solved by technology

The main purpose of the present invention is to solve the problems of insufficient carbon source, low efficiency and high energy consumption in the sewage treatment process, and at the same time carry out deep denitrification

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