Understanding flux decline in crossflow microfiltration. Part 1 - Effects of particle and pore size

Experimental data have been obtained from a computer controlled crossflow microfiltration apparatus. Polymer membranes of differing properties were characterised and used to filter aqueous suspensions carrying colloidal and fine particles of known shape, size, surface charge and chemical composition. The characterisation and experimental procedures are described and sample flux decline curves presented. By changing the size and size distribution of the feed and the pore size of the membrane in a systematic manner, the importance of the pore/particle size ratio to fouling is illustrated. The data obtained explain some of the apparent anomalies which have been presented in previous publications and highlight some important design criteria for membrane installations.