Multi-media filter is a process of using one or several filter media to pass water with high turbidity through granular or non-granular materials of a certain thickness under a certain pressure, thereby effectively removing suspended impurities and clarifying the water. Commonly used The filter materials include quartz sand, activated carbon, manganese sand, etc., which are mainly used for water treatment to remove turbidity, softened water, pre-treatment of pure water, etc. The turbidity of the effluent can reach below 3 degrees.
The multi-media filter is mainly to remove impurities such as mud, sand, suspended solids, colloids, and organisms such as algae in water, and reduce mechanical damage and pollution to reverse osmosis membrane elements.
The multi-media filter is composed of layered sand, manganese sand and activated carbon. The top layer of the bed consists of the lightest and coarsest grade material, while the heaviest and finest grade material is placed in the lower part of the bed. The principle is filtration by depth – larger particles in the water are removed in the top layer and smaller particles are removed deeper in the filter media. So that the water quality reaches the standard after coarse filtration.
When the raw water passes through the filter material from top to bottom, the suspended solids in the water are intercepted by the surface of the filter layer due to adsorption and mechanical resistance; when the water flows into the middle of the filter layer, due to the The sand particles in the water are arranged more tightly, so that the particles in the water have more opportunities to collide with the sand particles, so the flocs, suspended solids and sand particles in the water adhere to each other, and the impurities in the water are trapped in the filter material layer of the multi-media filter, thus being clarified water quality.
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