two. The relationship between the particle size of the filter and the height of the filling
The ratio of the height of the filter bed to the average particle size of the filter is 800 to 1000 (design specification).
The size of the particle size of the filter is related to the filtration accuracy.
The filter material of the multi-media filter (including the double filter filter) should have sufficient chemical stability. The relative density and particle size of each medium should be different. The two-layer filter filter composed of anthracite and quartz sand Of the anthracite relative density of 1.4-1.6, particle size of 0.8-1.8mm, quartz sand bulk density of 1.5-1.65, particle size of 0.5-1.2mm; 3 layer filter filter in addition to the above two kinds of filter can also be used Manganese sand, magnetite and the like, with a relative density of 4.7 to 5.0 and a particle size of 0.5 to 4 mm.
three. Design Factors of Filter Layer for Multi - media Filter
1, different filter with a large density difference, to ensure that anti-backlash will not occur when the mixed layer phenomenon.
2, according to the use of water selection filter.
3, particle size requirements of the lower filter particle size is smaller than the upper filter particle size, to ensure the effectiveness of the lower filter and full use.