AWWA WQTC65996

Anion exchange has been shown to be an effective process for the removal of natural organic material (NOM) from raw drinking water. In contrast to conventional bed-type ion exchange process configurations which follow solid-liquid separation processes, the magnetic ion exchange (MIEX) process, in which the anion exchange resin is impregnated with magnetic iron oxide, can be used as a pretreatment option to remove NOM prior to subsequent coagulation, oxidation, and disinfection. When used in this manner, coagulant, oxidant, and disinfectant doses are greatly reduced, as is the formation of subsequent disinfection byproducts. Many batch and continuous-flow pilot plant studies have been performed on a variety of raw waters to determine the requisite resin doses for effective NOM removal. The objectives of this paper were to examine the results of those studies, compare the results of batch, pilot-scale and full-scale tests, and to integrate the findings into a composite picture describing the performance of the MIEX process. Includes 2 references, table, figures.