A Way to Optimize Cation/Anion Resin Replacement Frequency

By Ted Chiu et al.

Ion-exchange Regeneration Resin

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T he traditional approach for determining replacement of cation/anion resins in the pretreatment comes from using results from resin analysis by an OEM after a few years of operation. This can be a good engineering approach. In this article, we will propose an innovative approach of combining engineering with economics to determine the replacement frequency of resins. In addition to the resin analysis, we use operational data such as the period between regeneration, the feedwater quality, and the bed volume production from the resins as a basis in determining the replacement of resins. In the production of high-purity water, there are generally two basic approaches used in removing ions from the waterï¾—namely, reverse osmosis (RO) and ion-exchange (IX) resins. The pros and cons in the application of either technology have been well understood and discussed (1). One key driver towards the use of IX as the primary deionizer is the lower chemical cost, which is regionally dependent. To maintain a proper balance between the capital cost and operational efficiency, the IX when applied in the pretreatment before an RO system, is generally designed to last one to two days between regenerations.

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