Low-carbon source two-stage MBR (Membrane-Bioreactor) enhanced nitrogen and phosphorus removal method for city sewage

Abstract

The invention discloses a low-carbon source two-stage MBR (Membrane-Bioreactor) enhanced nitrogen and phosphorus removal method for city sewage. The method is characterized by being a continuous flow nitrogen and phosphorus removal process with an adjusting tank, an anaerobic tank, a settling pond I, an aerobiotic MBR tank I, an anoxic pond, a settling pond II and an aerobiotic MBR tank II which are connected in series. The method comprises the following steps: firstly, feeding sewage into the anaerobic tank for anaerobic phosphorus release, further feeding the sewage into the settling pond I for sludge-water separation, feeding supernate obtained after settling into the aerobiotic MBR tank I for nitration and degradation of a part of organic matters, feeding settled sludge and a nitration liquid after aerobiotic nitration into the anoxic pond for denitrification phosphorus removal, feeding a part of a mixed liquid after anoxia into the settling pond II for settling sludge removal so as to remove phosphorus, feeding another part of the mixed liquid and the supernate of the settling pond II into the aerobiotic MBR tank II for further aerobiotic nitration and phosphorus removal, and finally filtering and discharging water by using an MBR membrane component. Due to two stages of aerobiotic MBRs, complete separation of nitration bacteria and phosphorus-accumulating bacteria can be achieved, the nitrogen and phosphorus removal effect can be improved, the process is simple in procedure and convenient to operate, and continuous water discharge can be achieved.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a two-stage MBR enhanced denitrification and phosphorus removal method for low-carbon source urban sewage denitrification and phosphorus removal. Background technique [0002] In today's world, with the intensification of industrialization, the production and use of a large amount of nitrogen- and phosphorus-containing fertilizers, industrial wastewater and a large amount of urban domestic wastewater caused by food processing and animal product processing, especially the sewage generated by phosphorus-containing detergents, can be used without treatment. discharge, resulting in eutrophication of water bodies. The eutrophication of the water body has serious harm to the environment. The eutrophication of the water body will affect the normal reoxygenation level of the atmosphere, reduce the dissolved oxygen concentration in the water body, and cause a large number of...

AI Technical Summary

Problems solved by technology

The single sludge system (SBR, SBBR) has a certain denitrification and phosphorus removal efficiency, but due to the differences in the sludge age (SBR) and the different requirements for DO and nutrients, the interaction between different microorganisms in the single sludge system, It is difficult to greatly improve the efficiency of denitrification and phosphorus removal

Dual-sludge systems such as A2N process, anaerobic-aerobic-anoxic multi-stage reactor, etc. can better achieve the enrichment of denitrifying phosphorus-accumulating bacteria and improve effluent water quality, but the intermittent dual-sludge system such as A2N process The system is inconvenient to operate, cumbersome to control, and cannot achieve continuous water discharge, and its denitrification and phosphorus removal efficiency and stability need to be further improved

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