Backflush sand filter

Abstract

The invention relates to a recoil sand filter, comprising a pool body, a filter, a pier column, and a sewage discharge device; the sewage discharge device includes an arched filter, a sewage storage tank, a pipeline, a valve and a sewage pump; the pool body The bottom is connected to the sewage storage tank, the sewage storage tank is connected to the pipeline, the pipeline is provided with a valve and a sewage pump, and an arched filter is arranged between the bottom of the pool body and the sewage storage tank; the present invention is especially suitable for seawater filtration in small water bodies The seawater is filtered and clarified from bottom to top and then discharged, which effectively avoids the drawbacks of the fine impurities in the filter layer packing falling down and polluting the seawater, and the invention adds a sewage discharge device, which can timely and effectively discharge the sediment and ensure the purity of the filtered seawater and filtration speed.

Description

technical field [0001] The invention belongs to the technical field of water purification, in particular to a recoil sand filter. Background technique [0002] Water quality is an important factor affecting the effect of seawater algae culture. In the cultivation stage, algae have higher requirements on water quality and are sensitive to irritants, and a little carelessness will lead to large-scale death. The water body for cultivating seawater algae often comes from the sea around the cultivation area. The seawater contains suspended impurities, and may also contain pathogenic bacteria, parasites, etc., so it is very necessary to carry out sedimentation, filtration, and sterilization treatment on the imported seawater. . In seawater algae cultivation in small water bodies, suspended solids and impurities in seawater are often filtered through sand filters. [0003] Currently commonly used gravity sand filters, such as the structure disclosed in patent application 2015207...

AI Technical Summary

Problems solved by technology

However, as the filtering capacity increases, more and more suspended solids are retained by the filter layer, not only will there be more and more bacteria and harmful organisms in the filter layer, but the filtering effect will become worse and worse, and the cleaning of the filter layer is very difficult. Convenience, very limited lifespan

[0004] A new type of sand filter has appeared on the market. As disclosed in patent application 201020171965.4, the raw water is filtered and clarified from bottom to top and then discharged. However, this sand filter cannot effectively deal with the impurities deposited at the bottom of the sand filter. After a long time, impurities will block the filter layer, seriously affecting the filtering effect, and it is very difficult to clean the sediment in the sand filter, which is inconvenient to operate

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