multi-media filter

Multi-media filter is a process that uses one or several filter media to pass water with higher turbidity through a certain thickness of granular or non-granular materials under a certain pressure, thereby effectively removing suspended impurities and clarifying the water. It is commonly used The filter materials include quartz sand, anthracite, manganese sand, etc., which are mainly used for turbidity removal in water treatment, softened water, pre-treatment of pure water, etc. The effluent turbidity can reach below 10%. Address: South Courtyard, Guandimiao Road, Jiugong, Daxing District, Beijing Telephone Fax Mobile Contact Ms. He
Multi-media filters are widely used in water treatment processes. Multi-media filters are mainly composed of the following parts: supporting pipelines and valves . The filter body also includes ① cylinder body ② backwash air pipe ③ water distribution component ④ support component ⑤ filter material ⑥ external exhaust valve, etc.

The multi-media filter material in the filter is high-quality uniform gravel Quartz sand, magnetite, anthracite and other filter materials are scientifically and orderly distributed in the filter tank according to their specific gravity and particle size. For example, anthracite with a small specific gravity and slightly larger particle size is placed on the top layer of the filter bed. Quartz sand with moderate specific gravity and small particle size is placed in the middle layer of the filter bed, and gravel with large specific gravity and large particle size is placed in the bottom layer of the filter bed. This ratio ensures that the filter will not produce chaotic layers during backwashing, thus ensuring the retention capacity of the filter material.

Multi-media filters, also known as mechanical filters, use layered anthracite sand, finely crushed garnet or other materials as a bed, which is a typical multi-media filter.
The top layer of the bed is made up of the lightest and coarsest grade materials, while the heaviest and finest grade materials are placed in the lower part of the bed. The principle is to filter water by depth. Larger particles are removed at the top layer, and smaller particles are removed deeper into the filter media. Thus, the water quality reaches the standard after coarse filtration.
The equipment is pressure type. Its principle is that when the raw water passes through the filter material from top to bottom, the suspended matter in the water is intercepted by the surface of the filter layer due to adsorption and mechanical flow resistance. When the water flows into the middle of the filter layer, due to the filter The sand particles in the material layer are arranged more closely, giving the particles in the water more opportunities to collide with the sand particles. As a result, the suspended flocs in the water and the surface of the sand particles adhere to each other, and the impurities in the water are trapped in the filter material layer, thereby obtaining clear water quality. . The suspended solids in filtered effluent can be below mg/L.