Project Summary Sludge in the city in Illinois Pond # 1 was taking up valuable treatment capacity and causing odors. Sludge had accumulated to the point where part of the sludge blanket was exposed to the surface allowing odors to escape. State regulators were also demanding improvements because BOD5 test results were too high. Situation Sludge accumulation creates several different problems for lagoon operators. About 2 mg/l of oxyg

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