Abstract
The paper discusses, from a practical point of view, the main factors that determine membrane selectivity in ultrafiltration (UF)/reverse osmosis (RO) processes. Retention characteristics of UF membranes are delineated through comparisons of the combined viscous flow and frictional model with the Ferry-Faxen equation. The molecular weight cut-off concept is discussed using calculations of how sharp cut-off curves one can expect of UF membranes with uniform pore sizes and how heteroporosity will affect such curves. Retention characteristics of RO membranes are presented for non-electrolytes and electrolytes. Retention variations in mixed-solute systems are also discussed. The influence of the porous sublayer on the integral membrane properties in different membrane processes is further discussed.
Part of this chapter has been reprinted with permission from Desalination 35 (1980), pp. 21–38.
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Jonsson, G. (1986). Selectivity in Membrane Filtration. In: Bungay, P.M., Lonsdale, H.K., de Pinho, M.N. (eds) Synthetic Membranes: Science, Engineering and Applications. NATO ASI Series, vol 181. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4712-2_12
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DOI: https://doi.org/10.1007/978-94-009-4712-2_12
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