Effective Diameter for Shear-Induced Diffusion for Characterizing Cake Formation in Crossflow Microfiltration at Polydisperse Conditions
Publication: Journal of Environmental Engineering
Volume 131, Issue 6
Abstract
During crossflow microfiltration, formation of cake layer on the membrane inhibits the filter performance. Previous studies on cake formation have focused on the monodisperse conditions, although most field applications are under the polydisperse conditions. In this study, microfiltration experiments were conducted to investigate the effect of particle size on cake formation, especially, at polydisperse conditions. Kaolin and two kinds of were used as polydisperse particles and a polysulfon hollow fiber microfilter was used as the membrane for the experiment. To describe the effect of particle size on cake formation at polydisperse conditions, effective diameter for shear-induced diffusion (EDSD) was introduced as a representative particle size. Statistical analyses of the experimental results showed that EDSD can be used in quantifying the potential of cake formation at polydisperse conditions, and the larger the EDSD, the thinner the cake layer. EDSD was an imperative indicator which showed the potential of cake formation at polydisperse conditions quantitatively and can be applied to find efficient strategies for reducing the cake layer.
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Acknowledgments
This work was supported by Grant No. 2000-2-30900-004-3 from the Basic Research Program of the Korea Science and Engineering Foundation. It was done in partial fulfillment of the requirements for the degree of Doctor of Philosophy of the first writer in Civil and Environmental Engineering at KAIST. He is currently a postdoctoral researcher at the Univ. of California, Riverside.
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Published In
Journal of Environmental Engineering
Volume 131 • Issue 6 • June 2005
Pages: 865 - 873
Copyright
© 2005 ASCE.
History
Received: Aug 18, 2003
Accepted: Jun 28, 2004
Published online: Jun 1, 2005
Published in print: Jun 2005
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