Separation of concentrated organic/inorganic salt mixtures by nanofiltration

V. Freger, T. C. Arnot, J. A. Howell

Research output: Contribution to journalArticlepeer-review

169 Scopus citations

Abstract

This paper considers nanofiltration (NF) of concentrated organic/inorganic mixtures using the FILMTEC(TM) NF-200B membrane. Mixtures of salt (up to 17% (w/v)) and lactic acid (2% (w/v)) were used as model solutions. The work centres on the effects of salt concentration, pH and temperature on the flux and rejection of lactate. For all solutions under study, the rejection of salt was low, while the rejection of lactate was maximal at neutral pH, and decreased with salt concentration and temperature. The flux was found to decrease with salt concentration and increase with temperature, the activation energy being higher for low fluxes. The flux for pure water and 2% (w/v) lactic acid was at a maximum at neutral pH, but for salt-containing solutions, it increased with pH in the whole range analysed (pH 3-10). The observed flux and rejection patterns suggest that the effects of skin shrinkage in concentrated salt solutions, and sorption of lactate by the membrane, affect behaviour in addition to the conventional effects of charge, solute size and osmotic difference between the retentate and permeate streams. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)185-193
Number of pages9
JournalJournal of Membrane Science
Volume178
Issue number1-2
DOIs
StatePublished - 15 Sep 2000

Keywords

  • Nanofiltration
  • Organic/inorganic separation
  • Osmotic pressure
  • Rejection
  • Sorption

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science (all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Fingerprint

Dive into the research topics of 'Separation of concentrated organic/inorganic salt mixtures by nanofiltration'. Together they form a unique fingerprint.

Cite this