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Salt concentration and recovery from aqueous solutions using pressure-driven membrane processes

Authors
Journal
Desalination
0011-9164
Publisher
Elsevier
Publication Date
Volume
104
Identifiers
DOI: 10.1016/0011-9164(96)00027-6
Keywords
  • Nanofiltration
  • Reverse Osmosis
  • Separation
  • High-Concentration Eutonic Solutions
Disciplines
  • Economics

Abstract

Abstract The capacities of nanofiltration and reverse osmosis high-pressure membrane systems to separate a high-concentration water solution have been investigated. The reverse osmosis membranes are able to retain NaCl, even if its concentration in aqueous solutions is near the saturation one. At the same time, it seems economically unreasonable to apply this process to electrolyte concentration over 100 g/l. Nanofiltration membranes keep their ability of selectively retaining ions at electrolyte concentrations in solutions up to 200 g/l. This enables us to use the nanofiltration membranes for separating multicomponent solutions into binary ones, from which the salts can be easily recovered by vaporization.

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