Comparison of Preozonation and Prechlorination in the Treatment of Several Raw Water Supplies

by William C. Becker, American Water Works Service Co, United States,
Ramon G. Lee, American Water Works Service Co, United States,

Document Type: Proceeding Paper

Part of: Environmental Engineering


Bench scale testing of 18 raw water supplies from various locations throughout the eastern United States was conducted to evaluate their susceptibility to ozonation, and to compare preozonation/conventional treatment to prechlorination/conventional treatment. Preozonation/conventional treatment was found to remove more organics as indicated by THM Precursors, UV absorbance, and true color (41%, 55% and 55%, respectively) than prechlorination/conventional treatment (26%, 43%, and 34% respectively). A subsequent one year pilot plant study comparing ozone/GAC to ozone/sand and chlorine/GAC was conducted on one of the raw water supplies - the Schuykill River at Norristown. Preozonation resulted in longer filter runs, lower head loss development, lower coagulant requirements and higher THM precursor removal than prechlorination. The GAC was more effective than ozone or chlorine for taste and odor removal.

Subject Headings: Water treatment | Water supply | Water quality | Comparative studies | Chlorine | Trihalomethanes | Waste treatment | United States

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