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Volume 7, Issue 6(Suppl) J Chromatogr Sep Tech
ISSN: 2157-7064 JCGST, an open access journal
Page 29
Notes:
Separation Techniques 2016
September 26-28, 2016
conferenceseries.com
Separation Techniques
September 26-28, 2016 Valencia, Spain
2nd International Conference and Expo on
Nanofiltration for the separation of polyvalent and monovalent ions in high saline solutions
R Ibanez, Ortiz P, Urtiaga A and Ortiz I
Universidad de Cantabria, Spain
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. Additionally, the Donnan steric pore model (DSPM)
together with experimentally determined parameters, effective pore radius (rp), thickness of the membrane effective layer
(δ) and effective membrane charge density (Xd), was proved accurate enough to satisfactorily describe the experimental
results providing the tools for process design and optimization. Finally, 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.
Biography
R Ibanez is an Associate Professor of Chemical Engineering at the Chemical and Biomolecular Engineering Department of the University of Cantabria, Spain. She
coordinates the research group IPS “Sustainable Processes Engineering” focusing her work in the research and development of advanced separation technologies
and their sustainable applications. She has been involved in more than 30 national and international research projects and has been Coordinator of about 10
research projects. She has published more than 60 papers in reputed journals and participates regularly in international conferences.
R Ibanez et al., J Chromatogr Sep Tech 2016, 7:6(Suppl)