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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received December 3, 2003
Accepted March 5, 2004

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Deposition of Submicron Particles in Deep Bed Filtration under Unfavorable Surface Conditions

Veeriah Jegatheesan Saravanamuth Vigneswaran¹ Seung-Hwan Lee^2†

School of Engineering, James Cook University, Townsville, Old.4811, Australia ¹Faculty of Engineering, University of Technology, Sydney, NSW 2007, Australia ²School of Civil and Envi. Eng., Kumoh National Institute of Technology, Gumi 730-701, Korea

dlee@kumoh.ac.kr

Korean Journal of Chemical Engineering, January 2005, 22(1), 142-146(5), 10.1007/BF02701476

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Abstract

Deterioration in the filter removal efficiency of submicron particles ( λ/ λo) under unfavorable surface conditions is affected by the number of deposited particles per filter grain. In the case of above micron particles, the deterioration of filter removal efficiency has been mainly due to the blocking effect of deposited particles and not by the number of deposited particles. Deposition of large number of submicron particles changed the surface characteristics of collectors (filter grain associated with deposited particles) and enhanced unfavorable surface conditions. Filtration experiments were conducted with monodispersed suspensions of known sizes of submicron latex particles at different ionic strengths, using glass beads as filter grains. The filtration performance was predicted by using a mathematical model, assuming a linear relationship between λ/ λo and σ (i.e. λ/ λo=1.k σ). For both particles, k was found to decrease and λo was found to increase with the increase in the ionic strength. A comparison was made of the importance of blocking effect for the filtration of submicron particles.

Keywords

Blocking Effect Deep Bed Filtration Filter Coefficient Submicron Latex Particles Specific Deposit

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