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Removal of boron, fluoride and nitrate by electrodialysis in the presence of organic matter

Journal Article


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Abstract


  • The removal of the trace inorganic contaminants boron (B(OH)4−), fluoride (F−) and nitrate (NO3−) from synthetic aqueous solutions containing organic matter using electrodialysis was investigated. The transport of the contaminants through the ion-exchange membranes was evaluated in relation to hydrated ionic radius, whereby a positive correlation was found in absence of organic matter. NO3−, with the smaller hydrated ionic radius and weaker hydration shell, was removed more effectively than F−, which has a larger hydrated ionic radius and stronger hydration shell. The removal of F− and NO3− was not significantly influenced by solution pH due to their pH independent speciation. However, the removal of boron was dependent on increasing solution pH and the degree of demineralization. Dissolved organic matter (humic acid, tannic acid and alginic acid) resulted in enhanced removal of boron and F− as a result of the binding of F− within the organic matter structure and complexation of boric acid (B(OH)3) with carboxylate groups in the organic matter. Deposition of organic matter to the anion-exchange membranes was noted. Inorganic trace contaminant and organic matter membrane deposition influenced system performance in regards to an increase in stack resistance and decrease in removal and flux of total dissolved solids.

UOW Authors


  •   Schäfer, Andrea I. (external author)
  •   Banasiak, Laura

Publication Date


  • 2009

Citation


  • Banasiak, L. & Schafer, A. I. (2009). Removal of boron, fluoride and nitrate by electrodialysis in the presence of organic matter. Journal of Membrane Science, 334 (1-2), 101-109.

Scopus Eid


  • 2-s2.0-64049085900

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1605&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/568

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 101

End Page


  • 109

Volume


  • 334

Issue


  • 1-2

Abstract


  • The removal of the trace inorganic contaminants boron (B(OH)4−), fluoride (F−) and nitrate (NO3−) from synthetic aqueous solutions containing organic matter using electrodialysis was investigated. The transport of the contaminants through the ion-exchange membranes was evaluated in relation to hydrated ionic radius, whereby a positive correlation was found in absence of organic matter. NO3−, with the smaller hydrated ionic radius and weaker hydration shell, was removed more effectively than F−, which has a larger hydrated ionic radius and stronger hydration shell. The removal of F− and NO3− was not significantly influenced by solution pH due to their pH independent speciation. However, the removal of boron was dependent on increasing solution pH and the degree of demineralization. Dissolved organic matter (humic acid, tannic acid and alginic acid) resulted in enhanced removal of boron and F− as a result of the binding of F− within the organic matter structure and complexation of boric acid (B(OH)3) with carboxylate groups in the organic matter. Deposition of organic matter to the anion-exchange membranes was noted. Inorganic trace contaminant and organic matter membrane deposition influenced system performance in regards to an increase in stack resistance and decrease in removal and flux of total dissolved solids.

UOW Authors


  •   Schäfer, Andrea I. (external author)
  •   Banasiak, Laura

Publication Date


  • 2009

Citation


  • Banasiak, L. & Schafer, A. I. (2009). Removal of boron, fluoride and nitrate by electrodialysis in the presence of organic matter. Journal of Membrane Science, 334 (1-2), 101-109.

Scopus Eid


  • 2-s2.0-64049085900

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1605&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/568

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 101

End Page


  • 109

Volume


  • 334

Issue


  • 1-2