AWWA ACE93182

A series of enhanced coagulation tests at the Metropolitan Water District of Southern California's (Metropolitan's) 5.5-million-gallon-per-day (MGD) Oxidation Demonstration Plant (ODP) was conducted from August to October 1992. Both of Metropolitan's source waters, California State project water (SPW) and Colorado River water (CRW), were tested in this study. There were two main goals for conducting these tests; the first goal was to determine whether this mode of operation is an effective strategy for controlling disinfection byproducts (DBPs) at a large-scale facility. The second objective of this testing, if enhanced coagulation was successful in minimizing DBP formation, was to determine the conditions at which Metropolitan's plant would have to operate in order to achieve a reasonable balance between operational costs and regulatory compliance. The results show that enhanced coagulation to meet the criteria being considered in the Disinfectant/DBP (D/DBP) Rule would increase water treatment costs.