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Rejection of trace organic chemicals by a nanofiltration membrane: the role of molecular properties and effects of caustic cleaning

Journal Article


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Abstract


  • This study aims to provide further insights to the rejection mechanisms of trace organic chemicals (TrOCs) by nanofiltration (NF). The separation mechanisms of TrOCs by an NF membrane were elucidated by assessing the role of molecular properties and the impact of caustic cleaning on their rejection. All charged TrOCs were rejected by the NF270 membrane by more than 80%. However, the rejection of positively charged TrOCs was lower than that of negatively charged TrOCs with similar molecular sizes and was similar to the rejection of neutral TrOCs. The results suggest that size exclusion, rather than electrostatic repulsion, was a major factor attributing to the rejection of these positively charged TrOCs. The results also showed that the minimum projection area was a better surrogate parameter for molecular dimensions than molecular weight. Our study highlights the need to monitor the rejection of neutral and positively charged TrOCs (particularly those that are normally moderately rejected by the membrane) following caustic cleaning.

Authors


  •   Fujioka, Takahiro (external author)
  •   Khan, Stuart J. (external author)
  •   McDonald, James A. (external author)
  •   Nghiem, Long D.

Publication Date


  • 2015

Citation


  • Fujioka, T., Khan, S. J., McDonald, J. A. & Nghiem, L. D. (2015). Rejection of trace organic chemicals by a nanofiltration membrane: the role of molecular properties and effects of caustic cleaning. Environmental Science: Water Research & Technology, 1 846-854.

Scopus Eid


  • 2-s2.0-84985001175

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=5812&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4785

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 846

End Page


  • 854

Volume


  • 1

Place Of Publication


  • United Kingdom

Abstract


  • This study aims to provide further insights to the rejection mechanisms of trace organic chemicals (TrOCs) by nanofiltration (NF). The separation mechanisms of TrOCs by an NF membrane were elucidated by assessing the role of molecular properties and the impact of caustic cleaning on their rejection. All charged TrOCs were rejected by the NF270 membrane by more than 80%. However, the rejection of positively charged TrOCs was lower than that of negatively charged TrOCs with similar molecular sizes and was similar to the rejection of neutral TrOCs. The results suggest that size exclusion, rather than electrostatic repulsion, was a major factor attributing to the rejection of these positively charged TrOCs. The results also showed that the minimum projection area was a better surrogate parameter for molecular dimensions than molecular weight. Our study highlights the need to monitor the rejection of neutral and positively charged TrOCs (particularly those that are normally moderately rejected by the membrane) following caustic cleaning.

Authors


  •   Fujioka, Takahiro (external author)
  •   Khan, Stuart J. (external author)
  •   McDonald, James A. (external author)
  •   Nghiem, Long D.

Publication Date


  • 2015

Citation


  • Fujioka, T., Khan, S. J., McDonald, J. A. & Nghiem, L. D. (2015). Rejection of trace organic chemicals by a nanofiltration membrane: the role of molecular properties and effects of caustic cleaning. Environmental Science: Water Research & Technology, 1 846-854.

Scopus Eid


  • 2-s2.0-84985001175

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=5812&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4785

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 846

End Page


  • 854

Volume


  • 1

Place Of Publication


  • United Kingdom