Abstract
Factors influencing the effectiveness of ion exchange resins used for chromate removal (from cooling tower effluents) containing chromate-based corrosion inhibitors, such as the CL-68 solution (17% zinc, 15% chromate), were studied in batch equilibrium experiments at ambient temperature. The adsorptive capacity (AC) of Amberlite IRA-900 resin markedly deteriorated with decreasing pH (3.3 to 6.1) from a maximum at pH.5. Experiments on chromate adsorption in the presence of typical cooling tower blowdown impurities showed a reduction in the AC of the resin at > 3000 ppM sodium chloride, but no adverse effect of sodium 2,4,5-trichlorophenate (70 to 314 ppM) or burner fuel oil (37 to 166 ppM) at pH.5 and 183 to 265 ppM input chromate concentration. Packed column studies supported the batch test results on the effect of pH and fuel oil (17,500 ppM) and showed no deterioration in the resin AC from the Triton X surfactant solution which was used to clean resin fouled by the fuel oil.
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