Ion Exchange

Anion exchange resins can be used for removal of sulfate ions. For example, a new deionization method (Kunin and Downing 1971) has shown over 9% efficiency in removing waste ions from acid mine waters. Sulfate ions are removed by an anion exchange resin functioning in the bicarbonate cycle according to the following reaction:

Resin regeneration is accomplished with dilute ammonium hydroxide followed by carbonation with carbon dioxide.

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