Turn-back flow high-efficiency rectangular double-layer settling pond

Abstract

The invention discloses a turn-back flow high-efficiency rectangular double-layer settling pond. In the settling pond, the body of the pond is divided into an upper layer and a lower layer by a partition board which is arranged horizontally, wherein a high-efficiency lateral flow inclined plate is arranged in a lower layer settling area so as to strengthen the suspended matter trapping efficiencyaccording to a shallow pond principle; sewage mixed solution enters an upper layer settling area from a water hole in one end of the partition board for further solid-liquid separation by tranquilflow settling, and the effluent is collected in and flows out from a water collection tank arranged at a water outlet end; and the settled sludge is scraped and absorbed by a chain-plate type mud scraperor mud scraper and absorber which can adapt to the unique structure of the settling pond, and at the same time, scum is scraped into a scum collection device. Compared with the prior part, the settling pond has the advantages of avoiding the phenomena such as short flow, obvious dead water area and sludge floating in a common settling pond, along with high settling efficiency, smaller floor area and lower operation cost.

Description

Technical field: [0001] The invention belongs to the technical field of water treatment equipment and relates to an improvement of sewage solid-liquid separation equipment. Background technique: [0002] The current secondary sedimentation tank of the sewage treatment plant mainly adopts the radial flow tank type, but this tank type is built separately from the aeration tank, resulting in a large area and high construction investment. The advection sedimentation tank has simple structure, low cost, convenient operation and maintenance, and is convenient for sludge discharge. It is widely used in the field of sewage treatment, but the sedimentation efficiency is low and the land occupation is still large. In recent years, an advection type secondary settling tank built together with an aeration tank has appeared, which saves land occupation and investment. However, due to the limitation of pool integration and joint construction, the aspect ratio of the advection type seconda...

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Problems solved by technology

[0002] The current secondary sedimentation tank of the sewage treatment plant mainly adopts the radial flow tank type, but this tank type is built separately from the aeration tank, resulting in a large area and high construction investment

The advection sedimentation tank has simple structure, low cost, convenient operation and maintenance, and is convenient for sludge discharge. It is widely used in the field of sewage treatment, but the sedimentation efficiency is low and the land occupation is still large.

In recent years, an advection type secondary settling tank built together with an aeration tank has appeared, which saves land occupation and investment. However, due to the limitation of pool integration and joint construction, the aspect ratio of the advection type secondary settling tank is generally only 0.2-0.5 , the aspect ratio is 3-5

Compared with the design parameters of advection sedimentation tanks commonly used in water supply treatment, its aspect ratio and length-depth ratio are lower than those of traditional advection sedimentation tanks, and the sedimentation tank is fed from the long end, so that the water flows on the entire cross-section The distribution is uneven, and its Frode number is far smaller than that of the traditional advection sedimentation tank, so the sedimentation stability is poor, and the phenomenon of "floating mud" at the end of the tank often occurs, which seriously affects the quality of the effluent water

[0003] In order to save land and improve sedimentation efficiency, the domestic water industry has conducted some research on the application of multi-layer sedimentation tanks. However, due to problems such as structural optimization, flow distribution and multi-layer sludge discharge, they cannot be properly resolved, resulting in inconvenient operation and sedimentation. The effect is unstable, so that it is difficult to be widely used

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