A2O(anaerobic-anoxic-oxic)-MBR (membrane bioreactor) sewage treatment device and method

Abstract

The invention discloses an A2O (anaerobic-anoxic-oxic)-MBR (membrane bioreactor) sewage treatment device which comprises an anaerobic pool, an anoxic pool, an oxic pool and a membrane pool which are sequentially and mutually communicated, and the anaerobic pool and membrane pool are communicated. The invention also discloses a sewage treatment method as follows: pretreated sewage respectively flows into the anaerobic pool and the anoxic pool; the sewage flowed into the anaerobic pool is fully mixed with the mixed liquid flowed back from the anoxic pool for biochemical reaction; the mixed liquid passing through the anaerobic pool sequentially enters into the anoxic pool, and is fully mixed with the flowed-in pretreated sewage and the mixed liquid flowed back from the oxic pool; the mixed liquid passing through the anoxic pool respectively flows into the oxic pool and the membrane pool; the membrane pool mixed liquid partly flows back into a first corridor of the oxic pool for fully mixing with the mixed liquid flowed from the anoxic pool, then is pushed to flow into other corridors of the oxic pool, and then flows into the membrane pool. The A2O-MBR sewage treatment device organically combines A2O and MBR processes, better solves the defects existing in traditional A2O and MBR processes to improve effluent water quality, greatly reduces the system operating energy consumption, reduces the cost of sewage treatment, and achieves energy-saving 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 high energy consumption of the MBR process, high processing costs, and poor phosphorus removal effects have also become bottlenecks in the popularization and application of this technology; On the one hand, due to differences in climate and living habits in southern cities in China, the concentration of pollutants in urban sewage is usually low (CODcr concentration is usually lower than 300 mg / L), and the status of one low and two high (low carbon, high nitrogen and phosphorus) in sewage , leading to a low level of sludge load in urban sewage treatment plants, reduced sludge activity, and limited further improvement of effluent water quality; at the same time, the actual influent water quality of sewage plants varies seasonally, and the invariability of existing treatment processes also It limits the improvement of effluent water quality; in addition, in order to maintain a good effluent effect of the membrane unit, 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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