THE DEVELOPMENT OF FLOCCULATION EFFECTS IN FILTER THEORY

A flocculation model of filtration was applied to estimate flocculation conditions in filter beds. The model was derived on the basis of hydraulic parameters and defined in terms of the mean velocity gradient in filter beds. The velocity gradient allows us to establish the effect of filter media density, which has not been yet described quantitatively. Presented are also relations between media density and the optimal filtration rate and filter bed depth. It was found that floes compressibility together with some other hydraulic parameters should be considered important when determining the filtration capacity of the beds. Development of the flocculation effects in filtration theory leads to the optimization of filter designing.