Abstract

When water contains bromide ions (Br −), ozonation favours the formation of bromates (BrO3 −) classified as ions with carcinogenic implications for human organisms. The permissible concentration of bromates in drinking water for the European Union and United States is now 10 μg/l. We proposed the anion-exchange membrane separation process referred to in the literature as Donnan dialysis for the removal of bromides or bromates from water. As a result of anion exchange between two solutions separated with an anion-exchange membrane, harmful anions are replaced with neutral ones, i.e., chlorides. The process was performed in a labora tory dialytic set-up comprising 20 cell pairs with anion-exchange membranes, Selemion AMV or Neosepta ACS. The feed was natural water enriched with bromides (500 μg/l) or bromates (100 μg/l); the receiver was an NaCl solution (100 mM). As for bromides, Selemion AMV and Neosepta ACS provided similar removal efficiency: 86% and 90%, respectively. As for the other anions, removal e...

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