Improving TOC Removal to Achieve EPA DBP Compliance at the Green Valley WTP

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Courtesy of IXOM Watercare

The Green Valley Water Treatment Plant (WTP) draws its water from two sources to supply Suisun, CA and surrounding communities. The WTP’s distribution system is very long resulting in lengthy detention times where free chlorine used for disinfection reacts with total organic carbon (TOC) to form high levels of Total Trihalomethanes (TTHMs). The Green Valley WTP was unable to adequately reduce the source water TOC levels to achieve
compliance with the Environmental Protection Agency (EPA) TTHM regulations. A MIEX® Treatment System was installed in January 2006 to reduce the treated water TOC level prior to disinfection. This resulted in over a 65% decrease in distribution system TTHM levels, allowing the Green Valley WTP to easily meet the EPA TTHM standard.

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