The Effect of Floc Size and Structure on Specific Cake Resistance and Compressibility in Dead-End Microfiltration
- 3 January 2003
- journal article
- Published by Taylor & Francis in Separation Science and Technology
- Vol. 38 (4), 869-887
- https://doi.org/10.1081/ss-120017631
Abstract
The effects of floc properties (size and structure) on specific cake resistance and compressibility of cakes formed by dead-end MF were investigated. Hematite particles of primary size 70 nm were flocculated in the presence of KCl and stirring and the resultant flocs were characterized in terms of floc size and fractal dimension. The results showed that larger flocs (ca 40 μm diameter) produced filter cakes of lower specific resistances and floc structural effects were more significant for smaller floc (ca 10 μm), with higher specific resistance for cakes formed from more compact flocs. These observations are explained by the balance of inter- and intra-floc flow and are in accord with a modified Carman-Kozeny relationship, which incorporates fractal dimension. Cake compressibility is strongly related to transmembrane pressure (TMP) particularly for smaller floc sizes. At low TMP (60 kPa) the porosity is...Keywords
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