Multimedia filter is an important pretreatment device of this system. It uses homogeneous quartz sand and smokeless media as filter material. Its function is to filter out fine particles, suspended solids, colloids and other impurities brought by raw water, so as to ensure that the quality of produced water meets the requirements of influent water quality of reverse osmosis device.
Multimedia filter (filter bed), which uses more than two kinds of media as filter layer, is used to remove impurities and adsorb oil in industrial circulating water treatment system, so that the water quality meets the requirements of recycling. The main function of filtration is to remove suspended or colloidal impurities in water, especially small particles and bacteria which can not be removed by precipitation technology. BODs and COD also have some removal effect.
Selection Basis of Filter Material
(1) Sufficient mechanical strength must be provided to prevent rapid wear and tear during backwashing.
(2) Good chemical stability;
(3) It does not contain substances harmful to human health or toxic substances, or substances harmful to production or affecting production;
(4) In the selection of filter materials, the filter materials with high adsorption capacity, high sewage interception capacity, high water yield and good effluent quality should be adopted as far as possible.
In the filter material, the pebble mainly plays a supporting role. In the process of filtration, because of its high strength, stable gap between each other, large pore, easy to wash in the process, filtered water can pass smoothly; similarly, in the process of backwashing, backwashing water and backwashing air can pass smoothly. In the conventional configuration, the pebbles are divided into four specifications, and the paving method is from bottom to top first big and then small.
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