Abstract
Parametric numerical studies were conducted to investigate quantitatively the hydraulic performance of typical sedimentation basins. These studies used a recently-developed mathematical model of basin hydrodynamics, which consists of a continuity equation, two Reynolds equations, a two-equation turbulence closure model and a particle transport equation. The resulting distributions of particle concentration throughout the basin, and the basin particle removal efficiencies, were computed as a function of particle fall velocity and the amount of particle deposition on the basin floor. The amount of short-circuiting in the basin was assessed quantitatively by directly computing the actual fluid detention time in the basin. A method for extending the model to an investigation of hindered settling is presented; this effect is briefly explored for basin inlet concentrations up to 1000 mg 1 −1.
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