Sludge reduction system and sewage treatment method

Abstract

The invention discloses a sludge reduction system and a sewage treatment method, belonging to the technical field of sewage treatment. The sludge reduction system comprises a biological treatment tank, a secondary sedimentation tank and a sludge reduction device, wherein the feeding end of the sludge reduction device is connected with the sludge end of the secondary sedimentation tank, and the discharging end of the sludge reduction device is connected with the biological treatment tank; and the sludge reduction device comprises a sludge reduction reactor, an acetic acid input device for adding acetic acid into the sludge reduction reactor and a stirring device arranged in the sludge reduction reactor. On the basis of a traditional sewage treatment process, a sludge reduction device is externally connected to a return sludge end, and the return sludge is treated by using acetic acid, so extracellular polymeric substances on the surface of the sludge are disintegrated, a part of cells undergo cytolysis, macromolecular organic substances are decomposed into micromolecular substances, and the purpose of sludge reduction is achieved. According to the sewage treatment method, the yield of sludge is reduced from the source, a good condition is provided for subsequent sludge treatment, and the operation cost of a sewage treatment plant is reduced.

Description

technical field [0001] The invention relates to a sludge reduction system and a sewage treatment method, belonging to the technical field of sewage treatment. Background technique [0002] As my country's economy develops faster and faster and people's requirements for a better environment are getting higher and higher, the amount of sewage that needs to be treated in our country is also increasing. Such as figure 1 Shown is a commonly used sewage treatment process, the sewage is introduced into the sewage treatment plant through the pipeline, and the water is discharged after passing through the grit chamber, the primary sedimentation tank, the biological treatment tank, the secondary sedimentation tank, the flocculation sedimentation tank and the filtration disinfection tank; Part of the sludge settled in the settling tank is returned to the biological treatment tank as return sludge, and the other part of the sludge is directly combined with the initial sludge in the pri...

AI Technical Summary

Problems solved by technology

This invention introduces a side flow reaction zone after the secondary sedimentation tank, and realizes sludge reduction by adding phosphorus-accumulating bacteria Tetrasphaera. The method is simple, but additional phosphorus-accumulating bacteria Tetrasphaera needs to be added, which increases the cost of sludge reduction.

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