The main factors to be considered in the design of multi-media filter are as follows:
1. Different filter media have large density difference, which ensures that there will be no mixed layer after backwashing disturbance.
2. Select filter material according to the use of water production.
3. Particle size requires that the particle size of the lower filter material is smaller than that of the upper filter material, so as to ensure the effectiveness and full utilization of the lower filter material.
In fact, taking the three-layer filter bed as an example, the upper filter material is composed of light filter material with large particle size and small density, such as anthracite and activated carbon; the middle filter material with medium particle size and medium density is generally composed of quartz sand; the lower filter material is composed of heavy filter material with small particle size and high density, such as magnetite. Due to the limitation of density difference, the selection of filter material for three-layer media filter is basically fixed. The upper filter material plays the role of coarse filtration, and the lower filter material plays the role of fine filtration, thus giving full play to the role of multi-media filter bed, and the quality of effluent is obviously better than that of single-layer filter material. For drinking water, anthracite, resin and other filters are generally prohibited.
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