Journal article

The effect of shear on gravity thickening: Pilot scale modelling

Brendan R Gladman, Murray Rudman, Peter J Scales

CHEMICAL ENGINEERING SCIENCE | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2010

Abstract

Mathematical models are potentially a valuable tool for the prediction of continuous gravity thickener operation. However, experience shows that existing mathematical models underestimate dewatering in thickeners for flocculated feed materials when predictions are made of either the underflow solids concentration for a given solids feed flux density or the maximum solids feed flux density achievable for a minimum underflow solids concentration set point. One reason postulated for this discrepancy is shear enhancement of sedimentation and bed dewatering as a result of aggregate densification. This process is not taken into account in conventional 1-D thickener models. A pilot scale column, op..

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