AWWA WQTC71520

In this research, TTHM and HAA5 levels at one central Missouri utility were extensively monitored to gain a better understanding of what actually occurs within the treatment process and through the distribution system. At this facility, Missouri River water is generally treated in an aeration-coagulation-flocculation-settling-carbon contact-settling-permanganate-polymer-settling-disinfection-filtration sequence before storage and distribution. Over a period of more than two years, water samples were taken on a weekly basis from locations within each major unit operation and at a few sites within the distribution system. Among other changes made during the course of this study, the utility elected to begin chloramination, and the effects of this change in disinfectant were then measured against other operational changes made at the facility. Includes 8 references, tables, figures.