Sewage filtering device

Abstract

The invention relates to a sewage filtering device which effectively solves the problems that sewage filtering equipment is difficult to stably maintain permeability for a long time, low in backflushing efficiency and high in equipment cost. According to the technical scheme, the device comprises a first vertical pipe, a liquid inlet pipe is installed on the side wall of the first vertical pipe, aliquid outlet hole is formed in the upper end of the first vertical pipe, and a filtering assembly capable of moving up and down in the first vertical pipe is installed in the first vertical pipe andcomprises a first piston, a second piston, a plurality of filtering pieces and a bottom block; the multiple filter pieces are vertically stacked between the second piston and the bottom block, gaps are reserved between the multiple filter pieces, when the filter assembly moves downwards, the space between the first piston and the second piston can be filled with liquid, and when the filter assembly moves upwards, the liquid between the first piston and the second piston is extruded out for back flushing. According to the invention, the permeability of the filtering assembly can be always ensured, the filtering efficiency is ensured for a long time, a filtering piece, a recoil pump, a reversing valve and the like do not need to be additionally arranged, and the equipment volume and cost are reduced.

Description

Technical field[0001]The invention relates to the field of environmental engineering, in particular to a sewage filtering device.Background technique[0002]Sewage treatment is an important subject of environmental engineering. Sewage treatment generally first removes solid impurities in the sewage through physical filtration. After a period of use of the sewage filter device, impurities will be deposited in the filter element, blocking the filter channel, and gradually reducing the filtration flow. Extend to be completely blocked; at present, the filter is generally cleaned by regular shutdown and recoil, but long-term impurity deposition usually forms stubborn impurities on the filter, which is not easy to clean, and the filtration flow gradually decreases during the normal filtration process It will also gradually reduce the filtration efficiency, and it is difficult to maintain the permeability of the filter element for a long time. In addition, normal filtration operations cannot...

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Problems solved by technology

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a sewage filter device, which effectively solves the problems that the sewage filter equipment is difficult to maintain permeability for a long time and stably, the recoil efficiency is low, and the equipment cost is high.

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