Sewage treatment system and application thereof

A sewage treatment system and sewage treatment technology, applied in water/sewage multi-stage treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of high ammonia nitrogen concentration, low nitrification efficiency, and nitrification low bacterial activity
CN102765857AInactive Publication Date: 2012-11-07SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI UNIVERSITY OF ELECTRIC POWER
Publication Date
2012-11-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a sewage treatment system which comprises a grating, a grit tank, a preaeration tank, an anaerobic tank, an anoxia tank, an aerobic tank and a secondary sedimentation tank. Sewage enters the grit tank after being treated by the grating, water discharged from the grit tank sequentially enters a biological treatment unit composed of the anaerobic tank, the anoxia tank and the aerobic tank to be treated, obtained mixed liquid enters the secondary sedimentation tank, two outlets are arranged on the secondary sedimentation tank, one outlet is a discharging port of treated sewage, and the other outlet is a discharging port of surplus sludge. A bypass is arranged on the discharging port of the surplus sludge, and one part of the surplus sludge discharged from the secondary sedimentation tank flows back to the preaeration tank through a sewage backflow pump. Simultaneously, one part of the mixed liquid from the aerobic tank flows back to the anoxia tank through a mixed liquid backflow pump on the bypass. The sewage treatment system has the advantages of being high in nitrobacterium activity, high in nitrification rate, high in ammonia nitrogen removing rate and the like.
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Description

technical field

[0001] The invention relates to a sewage treatment system and its application in sewage treatment, and belongs to the technical field of environmental protection and rational utilization of water resources. Background technique

[0002] Water pollution and water shortage are one of the serious environmental problems facing our country. In 2011, the national wastewater discharge was 65.21 billion tons, of which the chemical oxygen demand discharge was 24.999 million tons and the ammonia nitrogen discharge was 2.604 million tons. A large amount of wastewater discharge has caused serious pollution of surface water bodies in my country, seriously threatening the ecological environment, industrial and agricultural production, and human safety and health. In recent years, in order to control water pollution and protect water resources, relevant state departments have introduced a series of water pollutant control policies such as total pollutant discharge reductio...

Claims

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