摘要
並列摘要
One of the reasons for that the electro-filtration has not yet received wide acceptance in industries is an inadequate knowledge at the process. The research studied the influences of electric field on the filtration rate, average specific filtration resistance of cake and the electroosmotic pressure etc. by conducting experiments in constant hydraulic pressure electro-filtration. Theoretical analysis for predicting the filtration rate was also performed and showed results agree with the experimental data. It was concluded that in the case of filtering suspensions with high zetapotential, the increase of filtration rate is almost due to the contribution of electrophoretic migration of particles away from the septum. The electroosmosis theory in a capillary was modified to yield expressions for predicting the electroosmotic flow rate in packed beds. The prediction was confirmed by the experimental data. Electroosmosis in cakes was also analyzed and showed that the electroosmotic flow rate through cake is controlled by the local porosity and electric field strength at the highly compressed cake layer near the filter media.