Multi media filter is a process that uses one or several filter media to pass water with high turbidity through granular or non granular materials with a certain thickness under a certain pressure, so as to effectively remove suspended impurities and clarify water. The commonly used filter materials include quartz sand, anthracite, manganese sand, etc., which are mainly used for water treatment and turbidity removal, softening water, pre-treatment of pure water, etc., and the effluent turbidity can reach below 3 degrees.Meaning of filtration: in the process of water treatment, filtration generally refers to the process of intercepting suspended
impurities in water with filter material layers such as quartz sand and anthracite, so as to make water clear. The porous material used for filtration is called filter material, and quartz sand is a common filter material. The filter materials are granular,powdery and fibrous. Common filter materials include quartz sand, anthracite, activated carbon, magnetite, tourmaline, porous
ceramics, plastic balls, etc.
The multi-media filter (filter bed) is a medium filter with more than two media as the filter layer. In the industrial circulating water treatment system, it is used to remove impurities and adsorbed oil in sewage, so that the water quality can meet the requirements of recycling. The function of filtration is mainly to remove suspended or colloidal impurities in water, especially
micro particles and bacteria that cannot be removed by sedimentation technology. BOD5 and COD also have a certain degree of removal effect.
