AWWA MTC64603

Integrating precursor removal economically into an existing small microfiltration (MF) system has several challenges. Typically, budgets are limited, and integration must be made with existing treatment processes. A case study is presented illustrating the options available for disinfection byproduct (DBP) precursor removal in small MF systems and the engineering issues that must be faced for successful integration. Engineering design and operating results are presented for a small Colorado MF system that recently solved a high DBP problem. Big Elk Meadows, a Community Water System, uses a 50 gpm pressurized MF system to treat water with dissolved organic carbon (DOC) between 9 to 13 mg/L. Distribution system Total Trihalomethanes (TTHMs) and haloacetic acids (HAA5) had tested more than 250 ug/L. After considering several options, magnetic ion exchange (MIEX®) was installed as pretreatment to the MF system. Following MIEX® installation, TTHMs and HAA5 dropped to below Stage 2 Disinfection Byproducts Rule (DBPR) limits. Includes 3 references, tables, figures.