AWWA JAW59041

Enhanced coagulation has been identified as a treatment technique for improving total organic carbon (TOC) removal at conventional surface water treatment facilities. The authors conducted this study to evaluate site-specific strategies for optimized TOC removal, taking into account the many other treatment objectives affected by changing coagulant types and dosages. The authors found that four coagulants commonly used in conventional treatment processes successfully met minimum regulated disinfection byproduct (DBP) precursor control. Coagulant selection, however, was based on other interrelated factors including chemical cost or other secondary water quality treatment goals. Utility directors evaluating long-term DBP control using coagulation will benefit from the comparative coagulant cost and performance data presented. This work illustrates that low-cost jar-testing techniques can be useful in evaluating treatability costs and performance relative to optimized coagulation. Includes 16 references, tables, figures.