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The objective of this research was to study the effect of pre-coagulation on the removal of colloidal particles by applying membrane filtration. In this research, colloidal silica solutions were coagulated with Fe3+ first to increase the particle size, and then filtered through PVDF membrane by applying the dead-end filtration process. Deviations from the conventional cake filtration theory in the plot of dt/dv vs. v are shown again and none of the above theories can explain this phenomenon successfully. By using the critical-flux hypothesis and cake erosion term in conventional dead-end cake filtration theory, a theoretically sound model is introduced to simulate the flux decline successfully in this paper. Includes 16 references, figures.

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Edition: Vol. - No. Published: 06/16/2002 Number of Pages: 7File Size: 1 file , 390 KB