Sewage treatment system capable of meeting standards for directly-drained class-II and class-III ground surface water

Abstract

The invention discloses a sewage treatment system capable of meeting standards for directly-drained class-II and class-III ground surface water. The sewage treatment system comprises an anaerobic tank (21), an anoxic tank, an aerobic pool, a precipitation tank (26) and a membrane tank (27), wherein the anaerobic tank (21) communicates with a sewage tank (20), the anoxic tank communicates with the anaerobic tank (21), the aerobic pool communicates with the anoxic tank, the precipitation tank (26) communicates with the aerobic pool, and the membrane tank (27) communicates with the precipitation tank (26); and both residual sludge of the membrane tank (27) and residual sludge of the precipitation tank (26) are discharged into a sludge tank (28), and effluent of the membrane tank (27) and effluent of the precipitation tank (26) are mixed and then are directly drained into a drainage basin (30). The sewage treatment system is better applied to the upgrading and reconstruction of a municipal sewage treatment plant, and thus, the sewage treatment plant subjected to upgrading and reconstruction finally can directly drain into the class-II and class-III ground surface water; and meanwhile, the investment, floor area, operating cost and the like for the upgrading and reconstruction of the sewage treatment plant can be further reduced, so that the sewage treatment system has a good marketing and application prospect.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system that can meet the standard of directly discharging into Type II and Type III water bodies on the surface. Background technique [0002] In view of the successive introduction and implementation of more stringent local discharge standards, the traditional activated sludge method and its derivative technologies obviously cannot meet the ever-tightening pace of upgrading sewage discharge standards. Therefore, the upgrading and upgrading of sewage treatment plants is faced with the need to introduce new technologies and new processes for sewage treatment with better effluent quality and more stable operating effects. MBR sewage treatment is an effective treatment process for modern sewage treatment. It adopts membrane bioreactor (Membrane Bioreactor, referred to as MBR) technology, which is a new technology combining biological treatment technology ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a sewage treatment system that can meet the standard of directly discharging into Class II and Class III water bodies on the surface, which can effectively solve the problem of traditional activated sludge The method-MBR process is difficult to promote in a large area, etc.

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