Integrated analysis of NOM removal by magnetic ion exchange

Abstract

The magnetic ion exchange (MIEX®) process has been shown to be effective for the removal of natural organic matter (NOM) from drinking water. The process involves application of the resin in a pretreatment mode to remove NOM before subsequent coagulation, oxidation, and disinfection. Many batch and continuous‐flow studies have been performed on a variety of waters to determine the requisite resin doses for effective NOM removal. This work examined the results of several of those studies; compared the results of batch, pilot‐scale, and full‐scale tests; and integrated the findings into a composite picture describing MIEX process performance. Results indicated that dissolved organic carbon can be efficiently removed by effective resin doses of 0.5‐1.0 mL of resin per litre of water treated or bed volume rates on the order of 1,000 L of water treated per litre of resin regenerated and that batch test results can be used to scale up to plant‐scale performance.