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Experimental in situ measurement of concentration polarisation during ultra- and micro-filtration of bovine serum albumin and Dextran Blue solutions

: McDonogh, R.M.; Bauser, H.; Stroh, N.; Grauschopf, U.


Journal of membrane science (1995), No.104, pp.51-63
ISSN: 0376-7388
Journal Article
Fraunhofer IGB ()
Concentration polarisation; fouling; microfiltration; ultrafiltration

Concentration polarisation arising during the filtration of bovine serum albumin (BSA) and Dextran Blue is studied by two non-intrusive techniques. The first technique, which measures overall layer build up, is a further development of a radio isotope technique previously introduced. The second technique uses a micro-array of semiconductor photosites to measure infrared absorption of species in the polarised layer. The development of the polarised region is observed as a function of distance perpendicular to the membrane surface. The experiment with the ratio isotope labelled proteins using different pore size membranes demonstrated that there is a large similarity between filtration with different pore size membranes - from microfiltration to ultrafiltration. The amount of solute retained dynamically above the membrane is within half an order of magnitude, over pore sizes differing by 2 orders of magnitude. The directly observed concentration polarisation profiles followed generally e xpected trends, and demonstrated the large solute concentrations that exist near the membrane surface.