An a2o-mbr sewage treatment device and method

Abstract

The invention discloses an A2O-MBR sewage treatment device, which comprises an anaerobic pool, an anoxic pool, an aerobic pool, and a membrane pool connected to each other in sequence, and the anoxic pool and the membrane pool are also connected. A sewage treatment method is also disclosed: the pretreated sewage flows into the anaerobic pool and the anoxic pool respectively; After the mixed solution enters the anoxic tank continuously, it is completely mixed with the inflowing pretreated sewage and the mixed solution returned from the aerobic tank; the mixed solution after the anoxic tank flows into the aerobic tank and the membrane tank respectively; the membrane tank is mixed Part of the liquid flows back into the first corridor of the aerobic pool, completely mixes with the mixed liquid flowing into the anoxic pool, pushes it to other corridors of the aerobic pool, and then flows into the membrane pool. The invention organically combines the A2O process and the MBR process, better solves the defects existing in the traditional A2O and MBR processes, improves the water quality of the effluent, greatly reduces the energy consumption of the system operation, reduces the cost of sewage treatment, and realizes energy saving and emission reduction.

Description

Technical field [0001] The invention is a sewage treatment technology field, involving A2O-MBR sewage treatment devices and methods. Background technique [0002] The worsening situation of the water environment has exacerbated the sewage treatment rate and the degree of treatment. At the same time, with the acceleration of the urbanization process, the degree of sewage treatment, the land for treatment facilities, and the surrounding surroundings after completion are completed.The adverse effects of the environment have put forward stricter requirements.Among them, the development and application of high -efficiency and low consumption sewage deep treatment processes have become a hot spot for current water environmental governance. [0003] MBR (membrane bioreactor) is a sewage treatment technology combining membrane separation technology with biological treatment. It has a good solid solid separation effect (using membrane filtering method) and small grounded area (eliminated ...

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Problems solved by technology

[0004] However, the inherent defects of high energy consumption, high treatment cost, and poor phosphorus removal effect of the MBR process have also become bottlenecks in the popularization and application of this technology; The concentration of medium pollutants is usually low (CODcr concentration is usually lower than 300mg / L), and the current situation of one low and two high (low carbon and high nitrogen and phosphorus) in sewage leads to a low level of sludge load in urban sewage treatment plants. The decrease in activity limits the further improvement of effluent water quality; at the same time, the seasonal change of the actual influent water quality of the sewage plant, and the invariability of the existing treatment process also limit the improvement of the effluent water quality; The MBR process must adopt strong aeration to purge the membrane surface during operation, which brings a lot of energy consumption

These all limit the further popularization and application of the MBR process.

[0005]The traditional MBR process simply connects the biochemical tank and the membrane tank of the activated sludge treatment process (such as A2O, oxidation ditch or its variant process) in series. The connection is only maintained by the large ratio (300%~800%) reflux of the high-concentration mixed solution in the membrane pool. In addition, the two pools basically maintain independent operation; the high energy consumption and high cost of the MBR process are only from controlling the membrane cost. and membrane fouling, lack of systematic consideration of both

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