PROPERTIES OF THE CAKE LAYER IN THE ULTRAFILTRATION OF POLYDISPERSE COLLOIDAL SILICA DISPERSIONS

N.H. Ramli, A. Lord, L. Powell, P.M. Williams

Abstract: The properties of the cake layer formed during the ultrafiltration of polydisperse silica colloid using the Karman Cozeny equation have been studied and are compared to the experimental results obtained from SEM and AFM analysis. AFM analysis is used to give a direct comparison to SEM analysis in order to give a better understanding of the cake properties formed at different compositions and different pH’s. The trend of the filtration rate of binary mixtures of silica particles (W30 and X30) were analysed and correlated to the results of the specific resistance obtained from SEM analysis. The study involves analysing the fouled membrane from the top view and from the cross sectional view. This present work has found that results from the SEM and AFM analysis corresponded to each other in terms of particle arrangement and the average cake thickness

Keywords: polydisperse; cake resistance, colloidal -interaction

DOI: https://doi.org/10.15623/ijret.2014.0311039