Abstract
The increase in the filtration rate for such high-resistant slurries as microcystis was studied under constant-pressure conditions, using a dynamic filter with a rotating cylinder. The slurry was subjected to an intensive shear in the annular filter chamber between two co-axially arranged cylinders ; the inner cylinder (rotor) with the filter medium being the rotating part. The filter cake was continuously swept from the filter medium by the induced flow, thereby accomplishing filtration at a high rate. A further increase in the thin-cake filtration rate was also experimentally assured by adding Korean kaolin as a filter aid. The increase in the filtration rate was obtained by sweeping the filter cake more completely with the aid of both the kaolin and the induced flow, and was marked when the mass ratio of kaolin to microcystis was about 5. It has become apparent that the dynamic filtration performance was mainly dependent on the angular velocity of the rotor, the filtration pressure and the clearance of the filter chamber, and that an increase in the filtration pressure did not necessarily result in an improvement in the dynamic filtration rate.
