A multi media filter is a device which allows water with high turbidity to pass through a certain thickness of granular or non granular substances with the use of filtering media. It is a kind of equipment that makes high-turbidity water pass through a certain thickness of granular or non-granular substances by means of filtering media under a certain pressure so as to effectively remove suspended impurities and clarify water. The equipment is used for water treatment, turbidity removal, softened water, pure water pretreatment etc. The effluent can be reduced in turbidity to less than 3 degrees. So how does the selection and filling of equipment fillers work?
Instructions for Selecting Fillers for Multi media Filter
Common filter media are anthracite, ceramsite, quartz sand, activated carbon, etc. Among these filter materials, quartz sand has the advantages of high density, small particle size and low price; anthracite coal has the advantages of low density and strong pollution interception ability, and larger particles are more cost-effective. Anthracite is a mixture of activated carbon adsorption and quartz sand retention. It is widely applied in sewage treatment and degreasing filtration. Activated carbon has low density, strong deodorization and decolorization ability, and high price. Generally used for water filtration for drinking. Therefore, to choose fillers for multimedia filters, you need to know the properties of each type of filler and your needs.
How to fill a multimedia filter with filter material
The design of the filter layer of equipment generally need to consider theparticle size requirements, such as the lower filter material of the particlesize is less than the particle size of the upper filter material, to ensure theeffectiveness and full utilisation of the lower filter material. As thebackwashing, the density of the upper layer should be small to stillsatisfy the layering principle and the filter material from the upper layerwill sink to the lower layer after backwashing. For example, a two-layerfilter bed. The upper layer is made of lightweight filtering materials withlarge filtration particles and low density, such as anthracite and activatedcarbon; The lower layer is usually made of quartz sand with small particlesize and high density.To ensure the layered principle after backwashing,the density of the upper layer needs to be small, and the filter material ofthe upper layer will sink down to the lower layer after backwashing.
From this point of view, the choice of filter materials of multi mediafilters should not only be based on their own needs, but also the fillingof the filter materials should be based on their own needs. At the sametime, the equipment should be operated by a dedicated person, in orderto avoid avoidable errors that may affect the operation of theequipment.
