Sedimentation and sludge discharge method of tertiary sedimentation tank

Abstract

The invention discloses a sedimentation and sludge discharge method of a triple sedimentation tank, the method provides a triple sedimentation tank, the triple sedimentation tank comprises a tank body, a PAC adding tank, a PAM adding tank and a sludge tank, the upper end of an inner cylinder is rotatably provided with a rotating arm, the bottom of the rotating arm is fixedly provided with a siphon groove, and the bottom of the siphon groove is provided with a plurality of vertically arranged siphons; water discharged by the secondary sedimentation tank enters the tank body to be settled, when the sludge discharge pump is started, the sludge discharge pump discharges sludge in the sludge tank, and the sludge enters the sludge tank through the siphon pipe, the siphon groove, the sludge cylinder, the inner cylinder body and the communicating pipe according to the siphon principle and is finally discharged continuously. According to the sedimentation and sludge discharge method, the sludge at the bottom of the tertiary sedimentation tank is automatically siphoned into the sludge tank in the sludge discharge process, so that the disturbance to the sludge in the sludge discharge process is greatly reduced, and the sludge sedimentation quality of the tertiary sedimentation tank and the effluent reaching the standard are ensured.

Description

technical field [0001] The invention relates to a sedimentation and mud discharge method, in particular to a sedimentation and mud discharge method for a three-settling tank. Background technique [0002] In the process of sewage treatment, the sewage enters the three settling tank after passing through the regulating tank, biochemical tank, primary settling tank and secondary settling tank. Settling again, at this time, the sedimented sludge is not as viscous as the primary and secondary sedimentation, while the current tertiary sedimentation tank mainly includes a tank body, a rotating frame is installed on the tank body, and a scraper is fixed at the lower end of the rotating frame. During the rotation of the mud plate, the mud scraper scrapes the sludge from the bottom of the three settling tanks to the sludge outlet, and then discharges through the sludge outlet. However, the mud scraper will disturb the sludge at the bottom of the pool during the rotating mud scraping...

AI Technical Summary

Problems solved by technology

However, the mud scraper will disturb the sludge at the bottom of the pool during the rotating mud scraping process. At the same time, because the mud scraper cannot completely contact with the bottom of the pool, a layer of sludge will always pile up on the bottom of the pool, especially the three sedimentation The sludge at the bottom of the tank is relatively thin, so the disturbance is more severe, which affects the sedimentation quality of the three settling tanks, and may cause the COD of the water discharged from the three settling tanks to exceed the standard

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