AWWA ACE68675

This powerpoint presentation begins by providing a brief overview of the water system of Thomson, Georgia, and McDuffie County. Issues and challenges include the following: failure to comply with Stage 1 Disinfection Byproducts Rule; failure to meet limits for Disinfection Byproducts Rule (TTHM and HAA5) in Distribution System; failure to meet Total Organic Carbon (TOC) Reduction Requirement at Big Creek WTP; Disinfection Byproducts; and, formed by reaction between chlorine disinfectants and naturally occurring organic matter in surface water. Strategies included: carbon reduction in the plant filtered water; improve coagulation/filtration; oxidant addition; additional treatment technologies; carbon reduction in the distribution system; identified areas of inadequate water use, including flushing at low flow and chlorine booster where appropriate; reduced chlorine demand in system including unidirectional flushing and use of alternative disinfectant that requires less chlorine. Presentation results indicate that: distribution system improvements were in place; not enough DBP reduction; plants have been optimized to the maximum using conventional water treatment; not enough DBP reduction; additional treatment would be necessary to meet the Stage 1 DBP Rule; and, pilot testing evaluation showed GAC capable of high degrees of TOC removal and favorable operational costs. Includes figures.