Ion Exchange

Using a recycling regeneration process, it is possible to obtain an average recovery of 92% (Aston 1968). Hydrogen and sodium ions effect loss of exchange capacity (Blake and Randle 1967). The loss amounts to 50% when these ions total 15 g/l. On cooling tower water with 6 mg/l zinc concentration, a residual of below 1 mg/l is reported in the treated effluent. If zinc is being removed for recovery, the ability of ion exchangers to adsorb impurities may necessitate subsequent purification.

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