抄録
In order to establish a method for evaluating the particle retention performance of a ceramic membrane, microfiltration of suspensions of submicron polystyrene latex is performed, and the time changes in filtration rate, the particle rejection and the particle retention rate are evaluated. The rejection at the filtrate volume of 100cm per unit membrane area, R100, is plotted against the ratio of particle diameter to pore diameter, dp/dm, for various membranes and particles. The plots clearly demonstrate that the transition to almost complete particle rejection from partial particle transmission through the membrane occurs at dp/dm of about 0.1. Furthermore, the filtrate volume at which the rejection reaches 0.9, v0.9, is found to be one of the criteria for the evaluation of particle retention performance. This paper also proposes a method to evaluate the properties of filter cake formed on the membrane.
