Journal of Industrial and Engineering Chemistry, Vol.7, No.4, 250-258, July, 2001
Fouling Steps in the Microfiltration of Kaolin Suspensions
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Kaolin filtration experiments were carried out using a dead-end Amicon filtration cell with 0.2 μm polytetrafluoroethylene membrane as a function of operating pressure, kaolin concentration and stirring speed. Also, the intrinsic membrane. fouling and cake laver resistances were measured and calculated, respectively. For the system the cake layer resistance was dominant factor on permeate flux decline and increased with operating pressure and kaolin concentration. The experimental data of permeate fluxes were fitted by the constant pressure filtration models in order to investigate fouling steps. The cake filtration model was the most suitable for the stirring speed of higher than 300 rpm or 0.05 wt% kaolin solution. However, in the cases of higher kaolin concentration and lower stirring speed, the cake filtration model superimposed with standard pore blocking model after initial 60 to 90 minutes correlated well with the experimental data.
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