The report discusses the design, the construction and the first year's operation of the 1.5 mgd tertiary treatment plant located in Ely, Minnesota. The tertiary treatment plant was constructed to reduce the phosphorus concentration from the existing trickling filter plant effluent, a point source constituting 80% of the phosphorus entering culturally eutrophic Shagawa Lake. The tertiary plant was designed and constructed to reduce the total phosphorus concentration in the trickling filter plant effluent to 0.05 mg/l. The tertiary facility consists of flow equalization, two-stage lime clarification followed by dual-media filtration and chlorination. The report includes performance data, operational data, maintenance requirements, and operating costs for the Ely AWT facility. The report presents a thorough discussion of phosphorus performance data. There is a discussion of sludge treatment processes. Operating data described includes wastewater flow, chemical dose, pH, and clarifier solids volume. Frequent and routine maintenance items are included. Operating costs are divided into five categories and 27 sub-categories.

"Grant no. S-802309." Includes bibliographical references (page 69).