Gravity-type automatic back-flushing filter apparatus

Abstract

The invention provides a gravity-type automatic back-flushing filter apparatus. It is characterized in that the gravity-type automatic back-flushing filter apparatus comprises a cavity, and a filter plate, which is arranged in the cavity and separates the cavity into an upper part and a lower part. The cavity comprises a water inlet, a sludge outlet, and water outlet. The water inlet and the sludge outlet are arranged below the filter plate. The water outlet is arranged above the filter plate. The filter plate comprises a filter layer formed by curing silica sand and / or coated silica sand with a binder. The filter layer has a thickness of 2-5 mm. The inventive gravity-type automatic back-flushing filter apparatus can be easily cleaned during the back-flushing process, and is suitable for long-period use. Compared with the filter layer formed by natural piling of bulk sand, the filter layer according to the invention has lower silica sand consumption and better filtration quality, and no sand leakage during back-flushing. The gravity-type automatic back-flushing filter apparatus can be used in the fields of domestic wastewater treatment and micro-polluted water source treatment.

Description

technical field [0001] The invention relates to a filter device, in particular to a gravity automatic backwash filter device. Background technique [0002] The backwash filter device can backwash the filter layer, avoiding frequent manual cleaning or replacement of the filter layer, and meets the needs of continuous operation of the equipment. The gravity automatic backwash filter device realizes the backwash of the filter layer through gravity, saving external force Supplement, thus saving energy consumption, so it is widely used in the field of sewage treatment. [0003] The filter materials used for gravity automatic backwash filter mainly include fiber filter material, granular filter material and biofilm filter material. There are two forms of fiber filter material: fiber bundle and fiber ball. Both ends of the fiber bundle are fixed, and some fibers at the bound ends cannot be cleaned, resulting in rapid failure of the filter layer. It is necessary to stop production ...

AI Technical Summary

Problems solved by technology

There are two forms of fiber filter material: fiber bundle and fiber ball. Both ends of the fiber bundle are fixed, and some fibers at the bound ends cannot be cleaned, resulting in rapid failure of the filter layer. It is necessary to stop production and replace the filter layer soon. When rinsing, the cleaning water cannot pass through the binding, and it is easy to form mud cores and cause ball formation. Finally, the filter layer has to be replaced for a short period of time. Once the central binding is loose, it will shed hair until it is completely scattered, and the fibers will enter the filter with water. It seriously affects the filtration quality; although the biofilm filter material has high filtration accuracy, the cost of the filter material is high, and it is not suitable for the filtration of general domestic sewage and lightly polluted water sources; granular filter materials include silica sand, white coal and ore, etc., silica sand Due to the wide range of sources and low cost, it is widely used. When using silica sand as a filter material, the current method is to naturally stack the silica sand in the gravity automatic backwash filter device to form a sand layer as the filter layer. Since the naturally stacked silica sand is loose structure, so only a certain thickness of accumulation can play a filtering role, so the sand layer is not easy to be washed clean during backwashing, and long-term use will easily cause sand layer pollution and blockage, and the water flow will be reduced. The silica sand needs to be removed for manual cleaning or replacement. Moreover, when the loose sand is filtered, the surface of the sand layer is easily loosened by water, which affects the filtration quality, and the phenomenon of sand leakage during backwashing is serious.

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