ELECTRICAL-CONDUCTIVITY MEASUREMENT OF FILTER CAKE IN DEAD-END ULTRAFILTRATION OF PROTEIN SOLUTION

The dynamic ultrafiltration process of protein solution is experimenta lly investigated by measuring electrical conductivity within the filte r cake. Three pairs of platinum wire electrodes were employed to measu re the formation process of the filter cake on the membrane surface. T he filter cakes formed from protein solutes behave as highly compressi ble fakes and shifting of pH from 5 to 4 or 9 results in a decrease in cake compressibility, as well as specific filtration resistance. The experimental results for bovine serum albumin and soy protein solution s coincide favorably with the calculated results based on the compress ible cake filtration theory.