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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/5291

Title: The influence of sedimentation during downward cake filtration
Authors: Tarleton, E.S.
Issue Date: 2001
Publisher: The Filtration Society
Citation: TARLETON, E.S., 2001. The influence of sedimentation during downward cake filtration. Filtech Europa 2001 International Filtration and Separation Conference and Exhibition, Düsseldorf, Germany, October 16-18th.
Abstract: Data for near incompressible cake formations with simultaneous settling are presented. Aqueous calcite suspensions exhibiting similar median particle size, but different size distributions, were filtered over a range of constant pressures. For each experiment the time dependent history of filtrate removal and the particle size distributions of cake samples at different spatial positions were measured. These data were compared with predictions from a new mathematical model that divides cake formation into a range of discrete time steps. Cake growth due to filtration and sedimentation were considered to proceed simultaneously, but separately, with the additive results predicting the change in cake thickness during a time step. Account was taken of the changing effects of suspension concentration on settling rate and the transient influence of size distribution on specific cake resistance. The model is shown to quantitatively predict the influence of feed particle size distribution on cake formation and filtrate removal rates and favourable comparisons are made with values recorded in experiments. For the experimental conditions investigated, sedimentation is shown to contribute up to one third of the cake resistance in a filtration test. At lower pressures and with wider size distributions, larger particles from the feed tended to accumulate near the filter medium and in some cases a minimum cake resistance was observed toward a mean cake height. For higher pressures, however, the effect of particle
Description: This is a conference paper.
Version: Not specified
URI: https://dspace.lboro.ac.uk/2134/5291
Appears in Collections:Conference Papers and Presentations (Chemical Engineering)

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