Direct Filtration of Colored Water Supplies

by James K. Edzwald, Univ of Massachusetts at Amherst, Amherst, MA, USA,
William C. Becker, Univ of Massachusetts at Amherst, Amherst, MA, USA,
Steven J. Tambini, Univ of Massachusetts at Amherst, Amherst, MA, USA,



Document Type: Proceeding Paper

Part of: Environmental Engineering

Abstract: The effects of raw water quality, chemical treatment, and filtration variables on the performance of direct filtration are examined. Cationic polyelectrolytes as sole coagulants are effective in treating low turbidity, colored water supplies by direct filtration. The cationic polymer dosage required for treatment varied seasonally and is related to the raw water total organic carbon concentration. Greater removals of trihalomethane precursors were achieved with alum than with cationic polymers. Direct filtration with a flocculation period produces longer filter runs than in-line direct filtration. (Author abstract. )

Subject Headings: Filtration | Water quality | Chemical treatment | Water supply | Polymer | Trihalomethanes

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