Secondary sedimentation tank water inlet residue filtering device in urban domestic sewage treatment system

Abstract

The invention relates to the field of sewage treatment, in particular to a residue filtering device for a water inlet of a secondary sedimentation tank in an urban domestic sewage treatment system. Aservo motor is controlled by an electric cabinet to work, a transmission roller rotates, a slag scraping plate reciprocates up and down under the action of a traction rope and gravity, and large-volume suspended particles and dross filtered by a grid are collected into a slag receiving tank, so that pretreatment of an activated sludge mixed solution entering a secondary sedimentation tank is completed; large-volume suspended particles and dross in the activated sludge mixed solution are effectively removed, so that the problems that short flow occurs in a secondary sedimentation tank and the supernatant cannot reach the discharge standard are solved, and sewage treatment is completed.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a filter residue device at the inlet of a secondary sedimentation tank in an urban domestic sewage treatment system. Background technique [0002] The secondary sedimentation tank is one of the most commonly used tanks in the daily operation of the sewage system, and it is also the last link of biological sewage treatment. After aeration treatment, the sewage becomes an activated sludge mixture and enters the secondary sedimentation tank for mud-water separation. Only treated water can be discharged. After the sewage is aerated in the prior art, the activated sludge mixture contains some large-volume suspended particles and scum, and when these large-volume suspended particles and scum enter the secondary sedimentation tank, the flow rate of the activated sludge mixture will be uneven. , on the one hand, it will cause short flow in the secondary sedimentation tank, which will aff...

AI Technical Summary

Problems solved by technology

In the prior art, after the sewage is aerated, the activated sludge mixture contains some large-volume suspended particles and scum. When these large-volume suspended particles and scum enter the secondary settling tank, the flow rate of the activated sludge mixture will be uneven. On the one hand, it will cause short-flow phenomenon in the secondary settling tank, which will affect the sedimentation efficiency of the secondary settling tank. In the supernatant of the secondary sedimentation tank, it is discharged together with the supernatant

[0003] The existing technology does not pre-treat the activated sludge mixture entering the secondary settling tank, and filter and remove large-volume suspended particles and scum, so that there are large-volume suspended particles and scum that are difficult to settle in the supernatant of the secondary settling tank. Scum, unable to meet discharge standards

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