Multi-Media Water Filter is a process that uses one or several filter media to pass high-turbidity water through a certain thickness of granular or non-granular materials to effectively remove suspended impurities and clarify the water. The filter material is quartz sand, anthracite, manganese sand, etc. It is mainly used for water treatment to remove turbidity, soften water, and pre-treatment of pure water. The effluent turbidity can reach below 3 degrees.
Multi-media filter, which uses more than two media as the media filter of the filter layer, is used to remove impurities and adsorb oil in sewage in industrial circulating water treatment system, so that the water quality meets the requirements of recycling. The role of filtration is mainly to remove suspended or colloidal impurities in water, especially to remove tiny particles and bacteria that cannot be removed by precipitation technology. BOD5 and COD also have a certain degree of removal effect. Reduce mechanical damage and pollution to reverse osmosis membrane elements.
The multi-media filter is mainly composed of the following parts: supporting pipelines and valves. The filter body includes: ① cylinder; ② backwash air pipe; ③ water distribution component; ④ support component; ⑤ filter material; ⑥ exhaust valve (external), etc.
Inner filter layer composition: The multi-media filter material in the filter is high-quality uniform grain gravel, quartz sand, magnetite, anthracite, etc. The filter material is scientifically and orderly in the filter tank according to its specific gravity and particle size Distribution, such as anthracite with a small specific gravity and slightly larger particle size is placed in the uppermost layer of the filter bed, quartz sand with a moderate specific gravity and small particle size is placed in the middle layer of the filter bed, and gravel with a larger specific gravity and larger particle size is placed in the lowermost layer of the filter bed . This ratio ensures that the filter does not produce chaotic layers during backwashing, thus ensuring the retention capacity of the filter material.
Quartz sand filter is a kind of filter that uses quartz sand as filter material. It can effectively remove suspended matter in water, and has obvious removal effect on colloid, iron, organic matter, pesticide, manganese, bacteria, virus and other pollutants in water. It has the advantages of low filtration resistance, large specific surface area, strong acid and alkali resistance, oxidation resistance, PH applicable range of 2-13, good pollution resistance, etc. The unique advantage of quartz sand filter lies in the optimization of filter material and filter The design of the filter realizes the adaptive operation of the filter, and the filter material has a strong self-adaptability to the raw water concentration, operating conditions, pre-treatment process, etc., that is, the filter bed automatically forms an upper and lower dense state during filtration, which is beneficial to the The effluent quality is guaranteed under various operating conditions, the filter material is fully dispersed during backwashing, and the cleaning effect is good. The sand filter has the advantages of fast filtration speed, high filtration precision and large dirt interception capacity.
The quartz sand filter has the advantages of simple structure, automatic operation, large flow rate, few backflushing times, high filtration efficiency, low resistance, and convenient operation and maintenance.
The working principle of the multi-media filter: the water flow reversely passes through the filter layer to expand and suspend the filter layer. The filter layer is cleaned by the shear force of the water flow and the collision friction of the particles to remove the dirt in the filter layer and follow the backwash water discharge.
Multi-media filter application:
1.Pretreatment of reverse osmosis, electrodialysis, ion exchanger, ultrafiltration and other systems
2.Pre-filtration treatment of raw water for power generation, chemical industry, paper making, beverages, etc.
3.Decolorization and organic removal of water supply in chemical plants
4.Pretreatment of domestic water
5.Industrial water treatment
6.Swimming pool water treatment
7.Circulating water side filter system
8.Surface water and groundwater are reduced in turbidity and discolored.
9.Waste water treatment