Rapid Sand Filter In Hindi Video Civil Engineering
Rapid Sand Filters Rapid sand filters are divided into two main types: (1) gravity filters and (2) pressure filters. The principles of the two types of filters are identical. The pressure filter is operated at elevated pressures, thus prolonging the filter cycle and/or increasing the rate of flow of water through the filter. Gravity filters are commonly operated at 2 GPM/sq ft*, whereas pressure filters are operated at 3 GPM/sq ft and higher. The rapid sand filter is operated with clarification ahead of the filter. This step reduces the load on the filter, allowing longer filter runs and high-quality effluent at higher flow rates. Rapid sand filters have a layer of sand on layers of graded gravel and do not utilize a “Schmutzdecke” layer for the filtration action. Instead, the particulate matter is adsorbed on the sand in the layers below the surface. A considerable amount of support for the adsorption of solids (causing turbidity) as the predominant removal mechanism...
