Double-box gravity valveless filter

Abstract

A double-box gravity valveless filter comprises water tanks which are arranged in a bilaterally symmetrical mode; a shared high-level water tank is arranged above the top of the water tanks; a sharedsiphon water tank is arranged in front of the bottom of the water tanks; a water inlet is formed at the bottom of the high-level water tank; the water tank is divided into a clean water tank, a filtering water tank and a backwashing water tank sequentially from top to bottom; a communicating pipe is arranged between the clean water tank and the backwashing water tank; a water outlet is formed in the upper part of the side wall of the clean water tank; a siphon is arranged in the clean water tank; one end of the siphon extends into the backwashing water tank and the other end of the siphon extends into the siphon water tank; a filling layer is arranged in the filtering water tank; a plurality of filter material layers are arranged in the filling layer; a water distributing plate is arrangedbetween the filter material layer and the filter material layer; the double-box gravity valveless filter is uniform in water distribution, and has good filtering effect and good backwashing effect.

Description

technical field [0001] The invention relates to a sewage treatment device, in particular to a double-box gravity valveless filter. Background technique [0002] Valveless filters are widely used in surface water purification, side-flow filtration of circulating water, removal of suspended impurities in production wastewater, and filtration of organic sewage after biochemical and secondary sedimentation treatment. The steel valveless filter mainly uses the siphon principle for regular backwashing. The filter does not need valves for water inflow and outflow, flushing and drainage, and operates automatically by hydraulic action. Working principle: The raw water enters the filter tank through the water pipe and is filtered from top to bottom through the filter layer, and then enters the water storage tank. After it is full, it enters the clear water pool through the outlet pipe. Suspended solids are kept in the filter layer, resulting in increased resistance, which promotes th...

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Problems solved by technology

[0003] The filtration of sewage depends on the filter layer in the packing layer. In general, the filter layers in the packing layer of the filter are connected together, one layer after another, and the sewage is filtered layer by layer after passing through the filter layer; this method The defect is that the sewage cannot evenly contact the filter layer in the packing layer, because the flow rate of the sewage is too fast, it cannot fully contact with the filter layer and affect the filtering effect

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