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Nanofiltration separation of polyvalent and monovalent anions in desalination brines

Abstract: This work, as part of a global membrane process for the recovery of alkali and acids from reverse osmosis (RO) desalination brines, focuses on the nanofiltration (NF) separation of polyvalent and monovalent anions, more specifically sulfate and chloride. This pretreatment stage plays a key role in the whole recovery process. Working with model brines simulating the concentration of RO concentrates, 0.2–1.2 M chloride concentration and 0.1 M sulfate concentration, the experimental performance and modeling of the NF separation is reported. The study has been carried out with the NF270 (Dow Filmtec) membrane. The effect of operating pressure (500–2000 kPa), ionic strength (0.4–1.3 M) and chloride initial concentration (0.2–1.2 M) on the membrane separation capacity has been investigated. Finally, the Donnan Steric Pore Model (DSPM) together with experimentally determined parameters, effective pore radius (rp), thickness of the membrane effective layer (d) and effective membrane charge density (Xd), was proved accurate enough to satisfactorily describe the experimental results. In this work we provide for the first time the analysis of partitioning effects and transport mechanism in the NF separation of sulfate and chloride anions in concentrations that simulate those found in RO desalination brines.

 Autoría: Pérez-González A., Ibáñez R., Gómez P., Urtiaga A., Ortiz I., Irabien J.,

 Fuente: Journal of Membrane Science, 2015, 473, 16–27

 Editorial: Elsevier

 Fecha de publicación: 01/01/2015

 Nº de páginas: 12

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.memsci.2014.08.045

 ISSN: 0376-7388,1873-3123

 Proyecto español: CTQ2008-0690 ; ENE2010-15585 ; CTM2011-23912

 Url de la publicación: https://doi.org/10.1016/j.memsci.2014.08.045