Multi media filter is a process that uses one or several kinds of filter media to pass the water with high turbidity through a certain thickness of granular or non granular materials under a certain pressure, so as to effectively remove suspended impurities and make water clear. The commonly used filter materials include quartz sand, anthracite, manganese sand, etc., which are mainly used for water treatment, turbidity removal, softened water, pre-treatment of pure water, etc., and the turbidity of effluent can reach 3 degrees following.
The multi-media filter is mainly composed of filter body, matching pipeline and valve.
The filter body mainly includes the following components: cylinder; water distribution component; support component; backwashing gas pipe; filter material; exhaust valve (external), etc.
Selection basis of filter material
(1) It must have enough mechanical strength to avoid rapid wear and breakage in the process of backwashing;
(2) The chemical stability is good;
(3) It does not contain harmful and toxic substances to human health, and does not contain substances harmful to or affecting production;
(4) The selection of filter media should try to use the filter materials with high adsorption capacity, pollution interception capacity, high water yield and good effluent quality.
In the filter material, pebbles mainly play a supporting role. In the process of filtration, due to its high strength, stable spacing, and large pores, it is convenient for the filtered water to pass smoothly in the forward washing process; similarly, in the backwashing process, the backwashing water and air can pass smoothly.
In the conventional configuration, the pebbles are divided into four specifications, and the paving mode is from bottom to top, first large and then small.
Relationship between particle size and filling height of filter material
The ratio between the height of the filter bed and the average particle size of the filter material is 800-1000 (design specification).
The particle size of the filter material is related to the filtration accuracy.
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