Therefore, to help comply with these regulations as well as reduce sludge generation and overall treatment costs, the City evaluated the magnetic ion exchange resin (MIEX) developed by Orica Watercare. Accordingly, a pilot study was conducted to evaluate the selective DBP precursor removal capability of the MIEX resin in combination with a coagulant. MIEX is a continuous ion exchange process designed to achieve lower THM and HAA standards by removing the TOC fraction that is difficult to remove by conventional water treatment processes.
Selective DBP Precursor Removal with an Innovative Ion Exchange Process
The City of Chesapeake, Virginia has provided a reliable and safe drinking water to its customers for many years. The City has been providing this drinking water despite a water supply that is extremely high in organics with seasonal outbreaks of chlorides. As a result, the 10-mgd Northwest River Water Treatment Plant receives water that is frequently difficult-to-treat. This water requires very high coagulant dosages during all times of the year and seasonal reverse osmosis treatment to meet the EPA Stage 1 Disinfection Byproduct (DBP) standard for trihalomethanes (THM) of < 80 ppb and haloacetic acids (HAA) of < 60 ppb.