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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.