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Transfer of neutral organic solutes during desalination by electrodialysis : influence of the salt composition

Han, Le and Galier, Sylvain and Roux-de Balmann, Hélène Transfer of neutral organic solutes during desalination by electrodialysis : influence of the salt composition. (2016) Journal of Membrane Science, 511. 207-218. ISSN 0376-7388

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Official URL: http://dx.doi.org/10.1016/j.memsci.2016.03.053

Abstract

Electrodialysis is a promising process to treat saline water containing organic solute. The desalination performances are fixed by the transfer of salts and organic solutes. On the contrary to the transfer of salts,few results were reported regarding that of organic compounds. This is the objective of this work to investigate the transfer of neutral organic solutes (acetic acid, phenol, glucose) through ion-exchange membranes, focusing on the influence of the salt (NaCl, MgCl2, Na2SO4). Results show that the water transfer due to electroosmosis depends on the salt composition following the ion hydration. Two contributions, diffusion and convection, are pointed out for the transfer of organic solutes. Both are important and mainly fixed by steric effect. Concerning the influence of the ion hydration, reverse trends are found for both contributions. Decreasing diffusion flux is observed for increasing membrane counterion hydration showing the influence of the membrane structural properties. Increasing convection flux is observed for increasing ion hydration showing the influence of the solute hydration.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Membrane Science website : http://www.sciencedirect.com/science/journal/03767388
HAL Id:hal-01514488
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 Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Hélène Roux- de Balmann
Deposited On:26 Apr 2017 10:27

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