Method for evaluating cation-exchange resin and method for controlling water treatment system using the same

Abstract

A method for evaluating a strongly acidic cation-exchange resin wherein said strongly acidic cation-exchange resin is contacted with an aqueous eluting solution and polystyrenesulfonic acid being eluted from this resin is measured, which comprises the steps of setting a plurality of molecular weight ranges in the molecular weight distribution of the polystyrenesulfonic acid eluted, and evaluating the performance of the cation-exchange resin based on the relationship of each molecular weight range with the amount eluted in said each molecular weight range. The evaluation method allows precise evaluation of the performance of a cation-exchange resin independently of the structure of the resin matrix and the circumstance under which it is used, which leads to the determination of an optimum timing for replacement of a resin in a water treatment system using a cation-exchange resin, and thus to the extension of an replacement cycle of the resin and the reduction of an operation cost for the system.

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