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In relation to this article, we declare that there is no conflict of interest.
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Received August 28, 2000
Accepted October 13, 2000
articles 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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Effects of Pore Size, Suspension Concentration, and Pre-Sedimentation on the Measurement of Filter Medium Resistance in Cake Filtration

Department of Environmental Engineering, Inha University, Inchon 402-751, Korea 1Department of Environmental Engineering, Donghae University, Kangwon 240-713, Korea
Korean Journal of Chemical Engineering, September 2001, 18(5), 741-749(9), 10.1007/BF02706394
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Abstract

Theoretical and experimental study was conducted on the factors influencing the measurement of filter medium resistance by Ruth’s equation. It was determined that a filter medium having small pore size does not always give high filter medium resistance. The appropriate pore size of filter medium for filtration was analysed. The resistances of filter media measured with thick suspensions by Ruth’s equation have negative values. This phenomenon can be analyzed as the effect of sedimentation during the long filtration time due to thick suspension. When sedimentation occurs before the start of filtration, the filter medium resistance measured by Ruth’s equation gives a large value. It was determined that the result of the filtration of sediment was included in the filter medium resistance. A new method for measuring filter medium resistance by the filtration of the sediment is proposed. This method excludes the effects of suspension concentration and pre-sedimentation.

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