Sewage treatment system

Abstract

The invention discloses a sewage treatment system. The sewage treatment system is characterized by comprising an anaerobic treatment area, a low-dissolved-oxygen aeration treatment area, a high-dissolved-oxygen aeration treatment area, a sedimentation area, a water outlet channel and a sludge backflow area; the anaerobic treatment area is provided with a sewage inlet; the anaerobic treatment areacommunicates with the low-dissolved-oxygen aeration treatment area through first connecting pipelines; the low-dissolved-oxygen aeration treatment area communicates with the high-dissolved-oxygen aeration treatment area through second connecting pipelines; the high-dissolved-oxygen aeration treatment area communicates with the sedimentation area through a sewage channel; the bottom of the sedimentation area communicates with the bottom of the sludge backflow area; the side part of the sludge backflow area communicates with the anaerobic treatment area through third connecting pipelines; the bottom of the sludge backflow area communicates with the low-dissolved-oxygen aeration treatment area; the sedimentation area communicates with the water outlet channel through water outlet pipes; and the water outlet channel is provided with a water outlet. The sewage treatment system has the advantages of simple treatment process, lower operation cost, good sewage treatment effect and ideal denitrification and dephosphorization effect.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a sewage treatment system. Background technique [0002] Domestic sewage is the waste water discharged from the daily life of residents, mainly from residential buildings and public buildings. The pollutants contained in domestic sewage are mainly organic matter (such as protein, carbohydrate, fat, urea, ammonia nitrogen, etc.) and a large number of pathogenic microorganisms (such as parasitic worms and intestinal infectious diseases, etc.). Direct discharge of domestic sewage without treatment will lead to water pollution and black odor; bacteria and pathogens in sewage will use the organic matter in domestic sewage to multiply and enter the human body through various ways, causing human diseases; in addition, the phosphorus in sewage The direct discharge of nitrogen and nitrogen into the water body will cause eutrophication of the water body and seriously affect the ecological ...

AI Technical Summary

Problems solved by technology

Due to the gradual increase in the requirements for nitrogen and phosphorus removal in sewage treatment, A 2 The / O process has been continuously improved and developed, such as improving the inverted A 2 / O process, multi-stage AO process, etc., but these improved processes still require denitrification by mixed liquid return (that is, sewage from the aerobic tank is returned to the anoxic tank) and sludge return (that is, sludge from the sedimentation tank is returned to the anaerobic tank) for denitrification Phosphorus, in order to improve the efficiency of denitrification and phosphorus removal, the reflux ratio must be increased, which leads to complex treatment process, high operating cost, large floor area, and the effect of sewage treatment is not good, the treatment efficiency is low, and nitrogen removal at the same time The effect of phosphorus removal is not very ideal

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