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Integration of nanofiltration and bipolar electrodialysis for valorization of seawater desalination brines: production of drinking and waste water treatment chemicals

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Reig, M. Integration of nanofiltration and bipolar electrodialysis for valorization of seawater desalination brines.....pdf (386,4Kb)
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10.1016/j.desal.2015.12.013
 
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hdl:2117/90252

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Reig i Amat, MònicaMés informacióMés informacióMés informació
Casas, Sandra
Gibert Agulló, OriolMés informacióMés informacióMés informació
Valderrama Angel, César AlbertoMés informacióMés informacióMés informació
Cortina Pallás, José LuísMés informacióMés informacióMés informació
Document typeArticle
Defense date2016-03-15
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Nanofiltration (NF), as a selective Mg(II) and Ca(II) separation and concentration treatment, and electrodialysis with bipolar membranes (EDBM) were evaluated for the valorization of seawater desalination reverse osmosis brines (60 NaCl/L) to produce both rich Mg(II) and Ca(II) brines for phosphate recovery and HCl and NaOH as chemicals for desalination treatments. A NF pilot plant, using NF270 membranes at 20 bar, provided a rich Mg(II) (8.3 g Mg(II)/L) and Ca(II) (2.1 g Ca(II)/L) brine on the concentrated stream with enrichment factors of 3.2 for Mg(II) and 2.5 for Ca(II). The NF permeate stream containing 50 ± 2 g NaCl/L was treated to remove residual Mg(II) (760 mg/L) and Ca(II) (415 mg/L) by chemical precipitation with Na2CO3 and NaOH before the EDBM unit. Divalent cations free brine containing NaCl (50 g NaCl/L) were fed into the EDBM stack in order to produce NaOH and HCl under recirculation configuration. Constant voltage and acid and base concentrations at different initial conditions were evaluated to obtain the maximum acid and base concentration (approximately 1 M NaOH/HCl) at 9 V. No substantial effect of initial acid and base concentrations on the overall performance was observed. An energy consumption of 2.6 kWh/kg NaOH and current efficiency of 77 ± 3% were calculated
CitationReig, M., Casas, S., Gibert, O., Valderrama, C., Cortina, J. Integration of nanofiltration and bipolar electrodialysis for valorization of seawater desalination brines: production of drinking and waste water treatment chemicals. "Desalination", 15 Març 2016, vol. 382, p. 13-20. 
URIhttp://hdl.handle.net/2117/90252
DOI10.1016/j.desal.2015.12.013
ISSN0011-9164
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S001191641530148X
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  • SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials - Articles de revista [186]
  • Departament d'Enginyeria Química - Articles de revista [2.067]
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