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Mass transfer properties of chlorinated aromatic polyamide reverse osmosis membranes

Ettori, Axel and Gaudichet-Maurin, Emmanuelle and Aimar, Pierre and Causserand, Christel Mass transfer properties of chlorinated aromatic polyamide reverse osmosis membranes. (2012) Separation and Purification Technology, vol. 101. pp. 60-67. ISSN 1383-5866

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Official URL: http://dx.doi.org/10.1016/j.seppur.2012.09.008

Abstract

Water (A) and solute (B) permeability of aromatic polyamide (PA) reverse osmosis membranes (RO) were monitored under varying applied pressure, solute nature and concentration to assess their evolution after exposure of the membrane to free chlorine. Above a threshold value of 400 ppm h HOCl water permeability was influenced by permeation conditions during both filtration of ultrapure water (UP water) and reverse osmosis of salts performed sequentially. Water permeability decreased during the filtration of UP water performed at a constant applied pressure of 60 bar. During the reverse osmosis of an electrolyte solution, performed at a constant permeation flux of 31 L h¯¹ m¯², A was observed to increase continuously with time, e.g. up to a factor of 3 after exposure to 3120 ppm h HOCl, most severe dose used. Differences in the charge density of mono- and divalent cations did not influence the rate of increase of A with time, which was however shown to depend on salt flux and ascribed to a diffusion limited relaxation process presumed to occur within the dense hydrated PA network. The relative and opposite impact of applied pressure and of salt permeation highlighted the importance in distinguishing conditions under which the water permeability (A) of a chlorinated membrane is measured, whether during the filtration of UP water or of a salt.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF can be found at Separation and Purification Technology website: http://www.sciencedirect.com/science/article/pii/S1383586612004832
HAL Id:hal-00872911
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
Other partners > Veolia Environnement (FRANCE)
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Deposited By: Vincent GERBAUD
Deposited On:14 Oct 2013 14:12

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