Effects of Deposit Resuspension on Settling Basin

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Abstract
Scouring of deposits is one of the major factors in designing sedimentation basins for water and wastewater treatment systems. To express the degree of deposit resuspension a scouring parameter is introduced into a dispersion model. The parameter is taken into account in one of the boundary conditions of two-dimensional diffusion equation, which is simplified into a one-dimensional dispersion model. The scouring parameter is related to the longitudinal dispersion coefficient by a model experiment. On the basis of the mathematical expression developed, the existence of the optimum depth of a rectangular settling basin has been theoretically and has been experimentally verified.

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