Sequencing batch A2O sewage treatment method and device

Abstract

The invention belongs to the technical field of sewage treatment and discloses a sequencing batch A2O sewage treatment method. A device adopted in the method comprises an anaerobic pool, an anaerobic pool and a sequencing bath reactor (SBR) pool which are sequentially and mutually communicated and connected in series. Pretreated sewage respectively and continuously enters the anaerobic pool and the anaerobic pool, the sewage enters the SBR pool after being subjected to the biochemical treatment by the anaerobic pool and the anaerobic pool, water outlet is realized after the aeration in the SBR pool and the still standing sedimentation, and sludge in the SBR pool is fast discharged outwards through a sludge discharge pipe or can flow back into the anaerobic pool; and mixed liquid flows back into the anaerobic pool through a mixed liquid backflow pipe. The sewage treatment process has the advantages that the continuous A2O nitrogen and phosphorus removal process is combined with the SBRprocess, on one hand, the building of a secondary sedimentation pool in the traditional A2O process is omitted, and the occupied area of the process is reduced; and on the other hand, good nitrogen and phosphorus removal biochemical environment is created, the nitrogen and phosphorus removal effect of the SBR process and the equipment utilization efficiency are improved, meanwhile, the continuouswater inlet and water outlet of the SBR process is realized, and a higher volume utilization rate is realized.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment. Background technique [0002] The A2O (Anaerobic Anoxic Oxic) sewage treatment process consists of four treatment units: anaerobic pond-anoxic pond-aerobic pond-sedimentation pond. The sewage flows through each treatment unit in sequence, and the independent treatment units are sewage biological The nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria in the treatment provide a better living environment, so that better simultaneous nitrogen and phosphorus removal effects can be obtained, and have been widely used in the construction of existing sewage treatment plants. However, due to the contradiction of sludge age between nitrifying bacteria and phosphorus accumulating bacteria, and the competition between anoxic denitrification and anaerobic phosphorus release in terms of carbon source requirements, it is difficult for this process to obtain good simultaneou...

AI Technical Summary

Problems solved by technology

However, with the improvement of people's living standards, the increasing scarcity of carbon sources in sewage has brought new difficulties to the improvement of the efficiency of nitrogen and phosphorus removal in the MSBR process. In addition, in order to meet the biochemical function requirements of each reaction unit, each pool body All of them need to be equipped with corresponding equipment, so the cost increases accordingly. At the same time, the disadvantages of high equipment idle rate and complex structure restrict the large-scale application of this process.

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