Particulate filtration behaviors such as the flux decline and particle retention by the membrane during the course of filtration were examined for dead-end constant pressure microfiltration of dilute suspension of dual-sized submicron polystyrene latex (PSL) particles through a semi-permeable membrane with a pore size larger than both particle sizes. The variation of rejection of both larger and smaller particles with the progress of filtration was approximated by the logistic equation. Our analysis was based on the cake filtration model accompanied by partial permeation of particles through the membrane. The model enabled us to evaluate the variation of the reciprocal filtration rate with the filtrate volume per unit effective membrane area, the relation between the filtrate volume and the filtration time, and the characteristic filtration curve frequently employed in the analysis of the blocking filtration law, on the basis of the data of temporal variation of particle retention. It was found that the retention of smaller particles was particularly promoted by the increase in the relative concentration of larger to smaller particles. It was also found that lower applied filtration pressure promoted the retention of both larger and smaller particles, resulting in the profound flux decline.

通过双渗透亚微米级聚苯乙烯胶乳（PSL）颗粒的稀悬浮液通过半渗透膜对颗粒的过滤行为（例如通量下降和膜在过滤过程中被膜截留）进行死端恒压微过滤。孔径大于两种粒径。通过logistic方程可以估算出较大和较小颗粒的截留率随过滤过程的变化。我们的分析是基于滤饼过滤模型，伴随着颗粒部分透过膜的渗透。该模型使我们能够评估相互过滤速率随单位有效膜面积的滤液量，滤液量与过滤时间之间的关系的变化，根据颗粒保留时间随时间变化的数据，以及通常用于分析阻塞过滤规律的特征过滤曲线。已经发现，较大颗粒与较小颗粒的相对浓度的增加特别促进了较小颗粒的保留。还发现较低的施加的过滤压力促进了较大和较小颗粒的保留，导致通量急剧下降。