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SLOW SAND FILTER AND PACKAGE TREATMENT PLANT EVALUATION: OPERATING COSTS AND REMOVAL OF BACTERIA, 'GIARDIA' AND TRIHALOMETHANES
Citation:
Pyper, G. SLOW SAND FILTER AND PACKAGE TREATMENT PLANT EVALUATION: OPERATING COSTS AND REMOVAL OF BACTERIA, 'GIARDIA' AND TRIHALOMETHANES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-85/052 (NTIS PB85197051), 1985.
Description:
A two-year study was conducted on a municipally owned operating slow sand filter and a pressure diatomaceous earth (DE) filter, using the same source of supply. The systems were compared by monitoring ambient turbidity, particle county, total coliform, and standard plate count bacteria in the influent and filtered water as well as bacterial and Giardia cyst spikes. Both methods of treatment were comparable in effectiveness for most parameters. Turbidity removal tended to be better in the slow sand filter treatment than in the DE except for the period of time following slow sand filter scraping. Particle reduction tended to be very erratic in both systems for this particular source water.