Continuous suspended dirt filtering device and filtering and back-flushing method

Abstract

The invention relates to a continuous suspended dirt filtering device and a filtering and back-flushing method. Traditional sand filtration devices comprise rapid filter tanks, double-layer filter tanks and pressure filters, are in multiple forms but have common problems, namely halting back-flushing problems that filtering mediums are fixed in the filtering process and are blocked by suspended solids after being used for filtration for a period of time, the filtration speed is reduced, the filtration resistance is increased, and the water production capacity is reduced. The continuous suspended dirt filtering device comprises a sand filtration tank (10) connected with a clean water outlet pipe (3), wherein the clean water outlet pipe is connected with a sand-water separator (7), the sand-water separator is connected with a dirt discharging pipe (2) and an air sand lifting pipe (4) respectively, the air sand extraction pipe is connected with a water inlet pipe (1), an air lifting pump(9) and a water inlet distribution pipe (5) respectively, and the water inlet distribution pipe is connected with a backflow sand hopper (6). The continuous suspended dirt filtering device is appliedto the further purification of sewage in the subsequent sewage treatment process.

Description

Technical field: [0001] The invention relates to a continuous suspended dirt filtering device and a filtering and backwashing method, which are applied in the field of sand filtration and water purification Background technique: [0002] Traditional sand filter devices include quick filters, double-layer filters, pressure filters, diatomite filters, etc., but they all have a common problem, the problem of backwashing after shutdown, that is, the medium is not fixed during the filtration process. After a period of filtration, the filter medium is blocked by suspended solids, the filtration speed decreases, the filtration resistance increases, and the water production capacity decreases. At this time, it is necessary to perform backwashing to achieve the regeneration of the filter bed. When performing backwashing, the filter operation It must be interrupted, and a filter device must be added as a backup or alternately used in special cases. Although the purpose of continuous f...

AI Technical Summary

Problems solved by technology

[0002]Traditional sand filter devices include quick filter, double-layer filter, pressure filter, diatomite filter, etc., but they all have common problems , The problem of backwashing after shutdown, that is, the medium is fixed during the filtration process. After a period of filtration, the filter medium is blocked by suspended solids, the filtration speed decreases, the filtration resistance increases, and the water production capacity decreases. At this time, it must be carried out. Backwashing realizes the regeneration of the filter bed. When backwashing, the filtration operation must be interrupted. In special cases, a filter device must be added as a backup or used alternately. Although the purpose of continuous filtration is achieved, the process is complicated.

High equipment cost, large floor area, difficult operation and difficult management

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