Integrated precipitation filtration process

Abstract

An integrated precipitation filtration process couples precipitation and a cloth media disk filter process into treatment structures. A microfiltration cloth filter plate is added below an effluent weir in a horizontal flow sedimentation process for filtering outlet water, so as to realize synchronized water outlet of the effluent weir and the microfiltration cloth filter plate, and integrated precipitation filtration process. After entering the equipment, raw water is uniformly distributed by a water distribution zone, and precipitated in a precipitation zone. After precipitation, the water is sent out respectively by the effluent weir and the microfiltration cloth filter plate, so as to realize solid-liquid separation. After a period of operation, when the microfiltration cloth filter plate is blocked, backwashing startup conditions are met; and when the backwashing procedure begins, a backwashing trolley and a backwashing pump are started at the same time to carry out backwashing on the microfiltration cloth filter plate. The process provided by the invention increases removal rate of solid particles having sink speed lower than that of the surface load of the sedimentation tank, and has better effect than a traditional precipitation process. The process couples precipitation and filtration and reduces land occupation; the precipitation process is helpful to delay pollution process on the microfiltration cloth filter plate; and filtering by the microfiltration cloth filter plate can improve treatment effect.

Description

technical field [0001] The invention relates to water treatment, in particular to a process for solid-liquid separation through precipitation, which can reduce the content of solid particles in effluent water, improve the treatment efficiency of the currently widely used precipitation process, and not increase its occupied area. Background technique [0002] At present, the sedimentation tank adopts the water discharge method of the outlet weir. The water outlet capacity is greatly affected by the load of the outlet weir. If the load is too large, the quality of the outlet water will deteriorate and the solid-liquid separation will not be complete. And it is difficult to reduce the concentration of suspended solids (SS) in the effluent to less than 20mg / L by sedimentation technology alone, while the "Discharge Standard of Pollutants for Urban Sewage Treatment Plants" GB18918-2002 Grade A requires that the SS of the effluent of sewage treatment plants is less than 10mg / L , an...

AI Technical Summary

Problems solved by technology

[0002] At present, the sedimentation tank adopts the water discharge method of the outlet weir. The water outlet capacity is greatly affected by the load of the outlet weir. If the load is too large, the quality of the outlet water will deteriorate and the solid-liquid separation will not be complete.

And it is difficult to reduce the concentration of suspended solids (SS) in the effluent to less than 20mg / L by sedimentation technology alone, while the "Discharge Standard of Pollutants for Urban Sewage Treatment Plants" GB18918-2002 Grade A requires that the SS of the effluent of sewage treatment plants is less than 10mg / L , and to make the effluent reach the first-class A sewage treatment plant, it is a big challenge to make the SS reach the standard without increasing the treatment structure. Therefore, it is very important to develop a solid-liquid separation process that improves the treatment efficiency based on the current technology. necessary

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