Abstract
To comply with the Stage 1 and 2 Disinfectants/Disinfection Byproducts Rules, utilities have modified or changed their treatment processes, based typically on historical water quality. However, when there has been a significant degradation in source water quality, it has been a struggle to maintain compliance at many plants. The objective of this study was to develop long‐term planning tools to determine the potential effect of source water quality changes on the ability of existing treatment facilities to continue to comply with current and anticipated disinfection by‐product standards. These studies also evaluated the maximum concentrations for combinations of influent total organic carbon and bromide that the existing facilities could effectively handle and treatment costs under a worst‐case scenario. The planning tools were developed based on actual water quality and full‐scale operational data from the Metropolitan Water District of Southern California's water treatment plants. The tool was originally developed in 2007 and was calibrated and validated with newly available data in 2009.
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