Air-water backwash filter and air-water backwash method

Abstract

The invention relates to an air-water backwash filter and an air-water backwash method. The air-water backwash filter is characterized by comprising an air-water collection and distribution horizontal pipe and an air-water collection and distribution vertical pipe which are arranged at the bottom of the filter and used for filtering collected water and backwashing distributed water; and the air-water collection and distribution horizontal pipe and the air-water collection and distribution are arranged in a matched corresponding mode. The filter also comprises a rectangular water tank, an inlet pipe, a filtering material layer and a supporting layer, and a water collecting sump, wherein the rectangular water tank is used for evenly distributing unfiltered water and discharging backwash water; the inlet pipe is used for evenly distributing the unfiltered water in the rectangular water tank during filtering; the filtering material layer and the supporting layer are arranged at the lower end of the filter; the water collecting sump corresponds to the air-water collection and distribution vertical pipe and is provided with an outlet pipe and a backwash intake tube; the air-water collection and distribution vertical pipe is provided with inlet holes; the side face of the filter is provided with a drainage channel; and a drain pipe is connected below the drainage channel. The backwash process is divided into three stages as follows: stage one: air backwash; stage two: air-water backwash; and stage three: water backwash. The air-water backwash filter uses the air-water collection and distribution pipes to substitute a traditional filter head and filter plate, has the advantage of simplicity and rapidness in installation, is applicable to simultaneous construction without increase of additional large-scale equipment, is free from weather conditions, and can be rapidly installed to meet project demands especially for waterworks with a short construction period.

Description

technical field [0001] The invention relates to the related field of water plant filter tanks, in particular to an air-water backwash filter tank and an air-water backwash method. Background technique [0002] The water production process of a water plant generally consists of flocculation-sedimentation-filtration-disinfection, etc. Among them, the filter is the last process of routine treatment of water purification structures, and the operation of the filter directly affects the quality of the effluent of the water plant. During this process, the suspended solids, colloids and other impurity components in the water are removed by the filter material adsorption or gap barrier, and the water becomes clean. At the same time, due to the continuation of filtration, the space for containing dirt between filter layers gradually decreases, the head loss of filtered water increases, and the filtered water becomes less and less until the filter fails. Therefore, it is necessary to ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of air-water backwashing filter pool and air-water backwashing method at this, overcome existing filter pool complex structure, installation accuracy requirement is high and civil engineering cost is big, filtration period is short, operating cost is high and filtration Poor water quality, low degree of automation, limited pool area, small effective filtration area, etc.

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