Comparison of various settling velocity functions and non-Newtonian fluid models in circular secondary clarifiers

摘要: An axisymmetric single-phase model that predicts the sedimentation of activated sludge in a circular secondaryclarifier is developed. The k-ɛ turbulence used on two-dimensional, orthogonal and stepwise grid. concentration equation, which extended to incorporate field gravity, governs mass transfer clarifier. computational domain includes blanket where viscosity affected by rheological behavior sludge. Results case non-Newtonian fluid are compared with another numerical approach provided Lakehal et al. Non-Newtonian models—Bingham, Casson, Herschel-Bulkley—are used. influence settling velocity functions models flow isinvestigated. Finally, best introduced ways introduces plastic discussed.