a sewage treatment system

Abstract

A sewage treatment system, the selection area, the anaerobic pool, the anoxic pool, the aerobic pool, the sedimentation adjustment pool, the aerobic membrane pool, are connected successively through the outlet weir, and the sedimentation adjustment is arranged between the aerobic pool and the aerobic membrane pool pool. The feature of the invention process is that the system is oxidized in two stages and a sedimentation adjustment tank is set between the aerobic tank and the aerobic membrane tank, which greatly reduces membrane loss, ensures the membrane flux of the membrane tank, and significantly improves the system while reducing operating costs. Anti-shock load capacity; it saves the consumption of membrane in essence, and improves the processing efficiency of AAO at the same time. At the same time, because each unit is connected to each other, it can also save operating costs. The investment and operation cost of the overall device is low, and the effluent water quality is extremely high, which is especially suitable for the demand for sewage reuse in large and medium-sized cities with water shortages.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a new sewage treatment process system combining "anaerobic-anoxic-aerobic" (AAO) technology and membrane biotechnology (MBR). Background technique [0002] The AAO biological nitrogen and phosphorus removal process is the anaerobic (A)-anoxic (A)-aerobic (O) activated sludge method, which was developed by American experts in the anaerobic-aerobic (AO) method in the 1970s. Developed on the basis of the technology, it is a simultaneous denitrification and phosphorus removal process widely used at home and abroad. The mechanism is: the sewage is degraded through the anaerobic pond-anoxic pond-aerobic pond in turn. The main function of the anaerobic tank is to release phosphorus and oxidize some organic matter at the same time; the main function of the anoxic tank is to remove nitrogen; the aerobic tank has multiple functions to remove BOD 5 , nitrification and phosphorus uptake reacti...

AI Technical Summary

Problems solved by technology

[0004] Both the traditional AAO process and the MBR process have certain defects

In the AAO process, denitrification and phosphorus release compete for carbon sources in an anaerobic environment; due to the solid-liquid separation requirements of the secondary settling tank and the influence of sludge bulking and other factors, the sludge in the aeration tank cannot maintain a high concentration and thus limits biochemical reaction efficiency

In the MBR process, membrane fouling is prone to occur, resulting in a continuous decrease in membrane flux, which seriously affects the treatment efficiency; high membrane loss, high operating energy consumption, and high operating costs

[0005] Some improved MBR processes have emerged, such as the combination of the traditional oxidation ditch process and the MBR process. Although the internal reflux is set by combining the membrane treatment process, thereby enhancing the effect of nitrogen and phosphorus removal, this process has not solved the problem of the membrane reaction process. The main defects, namely "membrane fouling easily and high energy consumption cost of operation", etc., how to reduce the operation and maintenance costs under the premise of ensuring the quality of the effluent is the development direction of the MBR improved process

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