Selectivity Factor 2 - Polarisability

Two other major factors determining module selection are concentration polarisation control and resistance to fouling. Concentration polarisation control is a particularly important issue in liquid separations such as reverse osmosis and ultrafiltration. Hollow-fine-fibre modules are notoriously prone to fouling and concentration polarisation and can be used in reverse osmosis applications only when extensive, costly feed solution pretreatment removes all particulates. These fibres cannot be used in ultrafiltration applications at all. 

The conditions for the data collections are summarized in ref. The intensities of selected reflections [I > 2cr(I)] were corrected for Lorentz and polarisation factors but not for absorption. 

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