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RECORD NUMBER: 12 OF 12

OLS Field Name OLS Field Data
Main Title Organics, Polymers, and Performance in Direct Filtration.
Author Edzwald, J. K. ; Asce, M. ; Becker, W. C. ; Asce, A. M. ; Tambini, S. J. ;
CORP Author Massachusetts Univ., Amherst. ;American Water Works Service Co., Marlton, NJ. ;American Water Works Service Co., Inc., Haddon Heights, NJ.;Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab.
Year Published 1987
Report Number EPA/600/J-87/024;
Stock Number PB87-198495
Additional Subjects Performance ; Organic compounds ; Polyelectrolytes ; Flocculating ; Turbidity ; Dissolved organic matter ; Water quality ; Water treatment ; Filtration ; Reprints ; Trihalomethane
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB87-198495 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 21p
Abstract
The effects of raw water quality, chemical variables, and physical filter variables on direct filtration performance are examined. Cationic polyelectrolytes as sole coagulants are effective in treating low turbidity, colored waters by direct filtration. Cationic polymers can remove approximately 40% of the total organic carbon and trihalomethane precursors. Filtration rate, direct filtration mode (in-line versus flocculation), and water temperature did not have a significant effect on removals. Greater removals were achieved by alum. For waters containing relatively high concentrations of humic matter (color) or submicron size particles, direct filtration with a flocculation period produces less head loss development and longer filter runs. (Copyright (c) ASCE, 1987.)