Membrane Blocking In Ultrafiltration: A New Approach to Fouling

In this study a model was developed that describes membrane blocking during cross-flow ultrafiltration (UF). This fouling model is able to predict the relative importance of internal pore blocking, blocking of the pore entrance and filter cake formation related to permeation of model solutions of dextran T-70 and dextran 2000. The effects of transmembrane pressure, solute concentration and kind of solute on permeate volume were studied. When using a 0.1% dextran T-70 solution, membrane fouling was due to both internal pore blocking and cake formation. For the other operating conditions, membrane permeation was governed by just one blocking mechanism.

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