Middle-set type high density sediment water purification tank and purification technology thereof

Abstract

The invention mainly discloses a middle-set type high density sediment water purification tank and a purification technology thereof. The middle-set type high density sediment water purification tank comprises a reaction region, a clarification region and a sludge transfer tank. The reaction region comprises a mixing tank and a flocculation tank; the clarification region comprises a pre-sedimentation region, a sludge concentration region, an inclined pipe sedimentation region and a clear water canal, wherein the sludge concentration region is arranged at the bottom of the clarification region, the inclined pipe sedimentation region is arranged above the clarification region, and the clear water canal is connected with a water outlet pipe through a finger type water collecting tank positioned above the inclined pipe sedimentation region. A plurality of conical sludge collecting pits are arranged at one side of the bottom surface of the clarification region, and a sludge scraper is arranged on the bottom surface of the clarification region; a gas stripping device which lifts sludge in the sludge collecting pit to a sludge discharging groove at the upper part of the clarification region is arranged in each sludge collecting pit; the gas stripping sludge discharging groove is connected to the sludge transfer tank; the sludge transfer tank is connected with a water inlet pipe through a reflux pump; and simultaneously, the sludge transfer tank is connected with a sludge pump. The middle-set type high density sediment water purification tank has the advantages of having simple tank shape, compact structure and water outlet quality, being beneficial to the control on a sedimentation tank and the concentration and number of returned sludge, ensuring the stability of operation conditions and being low in operating cost.

Description

technical field [0001] The invention relates to the technical field of coagulation, sedimentation and separation in water purification plants, in particular to a mid-mounted high-density sedimentation water purification tank and its purification process. Background technique [0002] The technology of coagulation and sedimentation process in water purification plants generally adopts three methods in China at present: advection sedimentation tank, inclined tube sedimentation tank, and mechanical stirring clarification tank. The advection sedimentation tank is currently the most widely used pool type in large and medium-sized water plants in my country. It has the advantages of simple structure, convenient management, and strong impact load resistance. The disadvantage is that it has a long residence time and a large area. The removal effect is poor, and the cost of further improving the effluent water quality is very high, and the exposed area of ​​the water body is large, an...

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Problems solved by technology

Its disadvantage is that the civil structure is relatively complex and the construction is difficult; due to the low concentration of the return sludge, the return flow water is large; the biggest difficulty is that it is difficult to control the amount of sludge discharge, and the flocculation effect is often poor due to excessive sludge discharge. affect effluent quality

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