Chloride Cycle Anion Exchange

Strong base anion exchangers remove bicarbonate, as illustrated by the following reaction:

The principal regenerant is sodium chloride. Capacities can be increased by adding a small proportion of caustic soda to the salt. This process eliminates the need for acid-proof equipment and offers convenience, low cost, and a relatively small space requirement. In addition to bicarbonate removal, reductions in sulfate, nitrate, phosphate, anionic surfactants and color are also achieved. However, the effluent chloride level increases in the exchange.

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