Sewage treatment system

Abstract

The invention discloses a sewage treatment system, which comprises a selection area, an anaerobic tank, an anoxic tank, an aerobic tank, a precipitation adjusting tank and an aerobic membrane tank, which are connected in turn through an effluent weir, wherein the precipitation adjusting tank is arranged between the aerobic tank and the aerobic membrane tank. The sewage treatment system is technically characterized in that the system has two-stage oxidation and the precipitation adjusting tank is arranged between the aerobic tank and the aerobic membrane tank, so the membrane loss is greatly reduced, the membrane flux of the membrane tank is ensured, and the impact resistant loading capacity of the system is obviously improved while reducing the running cost; basically the consumption of the membrane is saved, and meanwhile the treatment efficiency of AA0 is improved; and composition units of the process device are built integrally in sequence and the units share the same wall, so the design can save investment and save space, and meanwhile the running cost can also be saved due to interconnection of the units. The integral device has low investment and running costs and ultrahigh yield water quality, and is particularly suitable for the requirements of water-lacking large and medium cities for recycling sewage.

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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