How to Select Filtering Media for MMF?
Selection of filler for multi-media filters
Commonly used filler for multi-media filters are anthracite, ceramic granules, quartz sand, activated carbon, etc. Among these filter materials, quartz sand has the advantages of high density, small particles and cheap price. Anthracite has the characteristics of small density, high dirt interception capacity, large particles and affordable price, and is often used in sewage treatment and oil removal filtration. Activated carbon has low density and strong deodorization and decolorization ability, but is expensive. Generally used for drinking water, in addition to the above-mentioned effects, it can also improve the taste of water.
Multi-media filter media filling instructions
Multi-media filter filter layer design generally need to consider the particle size requirements, the particle size of the lower layer of filter material is smaller than the particle size of the upper layer of filter material, to ensure the effectiveness of the lower layer of filter material and make full use of.
The density of the upper layer is small to ensure the recovery of stratification after backwashing, and the density of the upper layer is small to ensure that the upper layer filter material sinks into the lower layer after backwashing.
Take the two-layer filter as an example, the upper layer filter particle size is the largest, small density of light filter composition, such as anthracite, activated carbon lower layer filter particle size is small, high density, generally composed of quartz sand upper layer filter plays a coarse filtration role, small resistance, small head loss, the lower layer filter plays a fine filtration role, pollution capacity, multi-media filter to give full play to the role of small head loss, good filtration effect characteristics, give full play to the advantages of each medium.
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