Abstract
Abstract The authors presented at the Engineering Foundation Conference on Solid–Liquid Separation Systems III-2001 in Davos, software for the simulation of batch and continuous thickeners. The steady state of a continuous cylindrical thickener was simulated using the solid feed flux density function, the critical concentration, the solid effective stress and the required underflow concentration as input, in addition to the solid and fluid material densities. If the thickener area is known, the capacity and the concentration profile in the equipment are predicted. On the other hand, if the capacity is known, the required settling area and the resulting concentration profiles are predicted. In the present work, the software is extended to thickeners having conical bottoms. As model functions, two choices are possible, a solid flux density function for the whole range of solid concentrations or a solid flux density function for concentrations less than the critical and a sediment permeability and an effective solid stress for concentration above the critical. The following outputs can be chosen, the unit area, the cross-sectional area for a given capacity and height of sediment, the plot of sediment height versus thickener area for a given capacity, the plot of sediment height versus capacity for a given thickener area and the concentration profiles and mass balances for any of these cases.
Published Version
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