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Phosphorus Lake Treatment Effective, Ohio EPA Says

Sept. 30, 2011, 4:00 AM

CINCINNATI—The first large aluminum sulfate application at Grand Lake St. Marys reduced phosphorus levels in the center by 56 percent this summer, according to an Ohio Environmental Protection Agency project report released Sept. 28. Phosphorus from nonpoint source pollution feeds toxic blue-green algae, also known as cyanobacteria, that has restricted recreational use of Ohio’s largest inland lake for the past three years. While the chemical’s direct effect on algae is unclear, Ohio EPA Director Scott Nally said the $3.5 million treatment’s 50 percent phosphorus reduction target was exceeded. Aluminum sulfate was sprayed over the lake’s central 4,000-acre region in June; ...