Aspects of modelling in compressible filter cake formation

Solids concentrations through a solid/liquid mixture were determined using an electrical impedance measuring technique described previously. A number of pressure leaf filter experiments have been performed for two materials exhibiting a range of compressibility at differing applied filtration pressures, initial solids concentrations and surface charges. The paper indicates how such experimental data can be interpreted and modelled using both the classical and so-called ‘modern’ filtration theory. The need to enhance these models for compressible materials is highlighted with reference to the experimental data and the influential particulate and process parameters. Suggestions for the ways in which models can be improved are made.