Ion-exchange membrane processes for Br− and BrO3− ion removal from water and for recovery of salt from waste solution

Moreover, the potential of electrodialysis to recover NaCl from waste receiving solution after the Donnan dialysis and the usefulness of recovered solution to remove bromides and bromates was examinated. The best results of the process, i.e. required salt concentration in the concentrate (100 mM NaCl), and possible minimum contamination of the ballast ions (Br− or BrO3− and HCO3− and SO42 −) were obtained at a current density of 50 A/m2. Depending on a modification method of the recovered salt solution, it was obtained from 61 to 78% removal of bromides and from 79 to 86% removal of bromates.