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Abstract
Seawater RO brines have been identified as an alternative to common NaCl sources for the chlor-alkali industry. Electrodialysis (ED) has been evaluated as a preliminary step of NaCl concentration for these brines. Experimental results showed that ED was an effective concentration technology, where values up to 252 gNaCl L−1 were reached at 0.3-0.4 kA m −2 with a power consumption of approx. 0.20-0.30 kWh kg−1 NaCl. As the membranes used (Neosepta CIMS and ACS) were mainly selective for univalent ions, polyvalent ions were partially removed from the brine, benefiting its reuse. NaCl concentrated solutions are to be used as feed brine in the chlor-alkali industry after a purification step.
ACKNOWLEDGMENTS
This research study received support from the CDTI in Spain and from the Spanish government through project CTQ2008-06842-C02-01PPQ. It was also awarded a Ph.D. grant by the Spanish government (AP2007-04159) as part of the SOSTAQUA project. We would like to thank staff at the Solvay Unité de Recherche Electrolyse in Rosignano, Italy and at SOLVIN Martorell for their valuable input during the project. Our thanks go to G. Guerif and F. Lutin from Eurodia Industrie S.A (France) for their help throughout the project. Finally, we would also like to thank L. Calvo, S. Luis, V. Almazán, J. Piella, P. Solano, and N. Bonet for their contribution to the operation of the pilot plant.