Abstract
This article discusses a case study in the summer of 1998 where increased agricultural runoff and a reduction in surrounding forests caused progressively higher algae blooms in southern Pennsylvania's Lake Koon and Lake Gordon. This situation created severe taste and odor problems and shortened filter run times for the Evitts Creek, Maryland, Water Treatment Plant. The treatment plant had an ongoing problem with soluble manganese that also caused the water to discolor in the distribution system, creating staining problems at the tap. The article discusses how the installation of a dissolved air flotation (DAF) clarification system and replacement of five of 11 filters solved the increased algae problem and improved manganese removal.
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