DYNAMIC BEHAVIOR OF BSA CAKE LAYER DEPOSI TED ON MEMBRANE IN DEAD-ENDINCLINED ULTRAFILTRATION

We have observed the protein cake layer deposited on the membrane surf ace in dead-end ultrafiltration of bovine serum albumin (BSA) solution s. It is clarified that the protein cake layer mainly forms on the low er part of the membrane surface during inclined ultrafiltration, where the membrane is inclined. After downward ultrafiltration is conducted in the wake of inclined ultrafiltration, the deposited cake layer is spread over the membrane surface. As a result, total filtration resist ance R-t dramatically increases. The R-t-value in this case is in acco rdance with that in downward ultrafiltration, compared with the same f iltrate volume.