Downward-flow type continuous sand filter and operating method thereof

Abstract

The invention relates to a sand filter, in particular to a downward-flow type continuous sand filter, and belongs to supporting machinery of sewage treatment equipment. The downward-flow type continuous sand filter comprises a filter barrel, wherein a sand distribution device is arranged in the filter barrel; a sand filtering chamber is formed in the upper end of the sand distribution device; a to-be-cleaned sand chamber is formed in the lower end of the sand distribution device; a sand-filtering backwash assembly and a clear water output assembly are arranged in the sand filtering chamber. The downward-flow type continuous sand filter has the beneficial effects of being simple in structure, and capable of guaranteeing the operating continuity and improving the sewage filtering efficiency.

Description

technical field [0001] The invention relates to a sand filter, in particular to a downward flow continuous sand filter and an operation method thereof, which belongs to the supporting machinery of sewage treatment equipment. Background technique [0002] As a kind of water filtration equipment, sand filter can remove suspended solids in water to achieve the purpose of cleaning sewage. It is widely used in sewage treatment because of its good filtering effect. Ordinary sand filters generally include a filtration system and a sand washing system, wherein the filtration system includes a filter barrel, a sewage inlet pipe connected to the filter barrel, a sand filter layer (composed of sand particles) located in the filter barrel, and a filter layer set in the sand filter layer. When filtering, the sewage enters the water distributor from the sewage inlet pipe and enters the sand filter layer through the water distributor. When passing through the sand filter layer, the pollute...

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Problems solved by technology

In ordinary sand filters, the filter sand backwashing process is carried out under the condition of stopping the filtration, which will affect the continuity of the sand filter operation and reduce the sewage treatment efficiency. At the same time, backwashing will increase the washing equipment and increase energy consumption.

[0003] Chinese Patent Authorization Announcement No.: CN201643816, authorized announcement date November 24, 2010, discloses a sand filter, including a filter system, the filter system includes a filter barrel, a sewage inlet pipe, a sand filter layer located in the filter barrel and a The disadvantage of the water distributor in the sand filter layer is that the filter sand backwash process in this type of sand filter cannot be carried out simultaneously with the filtration process, and the filter sand can only be cleaned after the filter is stopped, which affects the sand filter. Sewage Continuity and Reduced Sewage Filtration Efficiency

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