Influence of cell-shape on the cake resistance in dead-end and cross-flow filtrations

The problems related to tortuosity variation whenever filter cakes are composed of cells with different shapes and compressible biosuspensions are discussed. Presented examples show that neglecting the tortuosity variation may lead to significant miscalculations of cake porosity or of specific cake...

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Bibliographic Details
Published in:Separation and purification technology 2002-05, Vol.27 (2), p.137-144
Main Authors: Mota, Manuel, Teixeira, José A., Yelshin, Alexander
Format: Article
Language:English
Subjects:
Applied sciences
Biological and medical sciences
Biotechnology
Cells
Chemical engineering
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Membrane filtration
Membrane separation (reverse osmosis, dialysis...)
Methods. Procedures. Technologies
Others
Porosity
Specific cake resistance
Tortuosity
Various methods and equipments
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Summary:The problems related to tortuosity variation whenever filter cakes are composed of cells with different shapes and compressible biosuspensions are discussed. Presented examples show that neglecting the tortuosity variation may lead to significant miscalculations of cake porosity or of specific cake resistance. Specific cake resistance of rod-like particles in cross-flow filtration depends on the higher tortuosity obtained by the shear-induced ordered arrangement. In turn, spheroid cells such as baker's yeast cells do not affect tortuosity as much as the rod-shaped cells. By including tortuosity as a parameter of compressible cakes, a more precise representation of cakes’ behaviour may be obtained. The tortuosity becomes a highly significant parameter with the increase in filtration pressure.
ISSN:1383-5866
1873-3794
DOI:10.1016/S1383-5866(01)00202-7