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A method for the determination of the settling velocity for sludge as a function of turbulence intensity and sludge concentration has been developed. The principle of the method is to continuously feed the top of a settling column with sludge so that a steady state and uniform concentration distribution occurs in the middle of the column. This eliminates time scale effects such as flocculation from...
Two predation-rate models are reviewed: one, a stochastic model by MacKenzie et al. (1994) applies to the scales of intermediate and fully turbulent deformation; the other, a deterministic model by Jenkinson and Wyatt (1992) applies to the scales of laminar shear. Both models predict that predation rate should be a dome-shaped function of deformation rate. This is because, above a given deformation...
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