Sewage treatment device and treatment method for sewage plant

Abstract

The invention discloses a sewage treatment device for a sewage plant. The sewage treatment device comprises a sewage collecting pipe, a slag removal pool, a grit chamber, an anaerobic tank, an oxidation ditch, a secondary sedimentation tank, a contact disinfecting tank, a sludge storage tank, a concentration tank, an extraction tank and a drying crusher, wherein the slag removal pool is communicated with the sewage collecting pipe; the grit chamber is communicated with the slag removal pool; the anaerobic tank is communicated with the grit chamber; the oxidation ditch is communicated with the anaerobic tank; the secondary sedimentation tank is communicated with the oxidation ditch; the contact disinfecting tank is communicated with the secondary sedimentation tank; the sludge storage tank is communicated with the secondary sedimentation tank, the oxidation ditch and the anaerobic tank; the concentration tank is communicated with the sludge storage tank; the extraction tank is communicated with the concentration tank; the drying crusher is communicated with the extraction tank; and a chemical feeding opening is formed in the extraction tank, and is used for feeding citric acid. According to the sewage treatment device for the sewage plant, COD and BOD of sewage of the sewage plant can be effectively reduced; and meanwhile, heavy metals in bottom mud can be removed, and then the bottom mud after heavy metal removal is subjected to agricultural utilization, so that the secondary environmental pollution is reduced, and the resource utilization rate is increased. In addition, the invention also provides a sewage treatment method for the sewage plant.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a sewage treatment device of a sewage plant and a sewage treatment method of the sewage plant. Background technique [0002] Sewage produced in the process of human life is one of the main pollution sources of water bodies, mainly including feces and washing sewage. The amount of domestic sewage discharged per person per day in the city is 150L to 400L, and its amount is closely related to the living standard. Domestic sewage contains a large amount of organic matter, such as cellulose, starch, sugars and fatty proteins; it also often contains pathogenic bacteria, viruses and parasite eggs; inorganic salts such as chloride, sulfate, phosphate, bicarbonate and sodium, Potassium, calcium, magnesium, and a small amount of heavy metals. [0003] In response to the above problems, most cities currently have sewage treatment points to treat these domestic sewage before discharging it ...

AI Technical Summary

Problems solved by technology

[0007] However, the above disclosed patents are still unable to simultaneously effectively remove the organic matter in the sewage of the sewage plant and the resource utilization of the sludge in the process of sewage treatment

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