Sewage treatment system and treatment method

By combining a multi-stage wastewater treatment system with microbial functions, the problem of unstable effluent quality in the MSBR activated sludge process after changes in water source has been solved. This has achieved stable compliance with total nitrogen and total phosphorus standards and control of suspended solids, reduced the risk of sludge runoff, and ensured stable effluent quality.

CN121894869APending Publication Date: 2026-04-21SHANXI TAIGANG STAINLESS STEEL CO LTD
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Patent Information

Application Number
CN202610169289.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-05
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

The conventional MSBR activated sludge process suffers from unstable effluent quality after changes in the water source. The total nitrogen and total phosphorus contents are difficult to consistently meet the standards, suspended solids are prone to exceed the standards, and there is a high risk of sludge runoff.

Method used

A multi-stage wastewater treatment system is adopted, including an anaerobic tank, an anoxic tank, an aerobic tank, and two sets of sequencing batch reactors. Through the dual reflux of sludge and mixed liquor and multi-stage sequential reaction, combined with the functions of polyphosphate-accumulating bacteria, denitrifying bacteria and other microorganisms, a multi-stage sequence of anoxic-aerobic-anoxic-aerobic-anoxic-aerobic-sludge discharge is achieved, which strengthens the microbial environment and stabilizes nitrogen and phosphorus removal.

Benefits of technology

It improves the stability of effluent water quality, ensures that the total nitrogen and total phosphorus content meet the standards, reduces the risk of excessive suspended solids, reduces sludge runoff, and achieves effluent suspended solids control below 5, thus improving water quality stability.

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Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment system and a sewage treatment method.The water inlet end of an anaerobic tank of the system is connected with a sewage pipe and a sludge return pipe of a pre-anoxic tank, the water outlet end of the anaerobic tank is connected with the water inlet end of an anoxic tank, the water inlet end of the anoxic tank is connected with a mixed liquid return pipe of an aerobic tank, and the water outlet end of the anoxic tank is connected with the water inlet end of the aerobic tank; one path of the water outlet end of the aerobic tank is connected with the anoxic tank through a mixed liquid reflux pump, one path is connected with the water inlet ends of the first sequencing batch tank and the second sequencing batch tank, and the first sequencing batch tank and the second sequencing batch tank are respectively connected with the sludge concentration tank. The treatment method comprises the following steps: (1) a pretreatment stage; (2) anaerobic stage; (3) an anoxic stage; (4) aerobic stage; (5) a multi-stage step sequence stage; (6) a sludge concentration stage; and (7) a pre-hypoxia stage. According to the system and the method, a double-reflux and multi-stage process is realized, the biological environment of microorganisms is enhanced, the total nitrogen content and the total phosphorus content stably reach the standard, suspended solids reach the standard, and the sludge running risk is reduced.
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