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Aerial view of the Western Lake Superior Sanitary District wastewater treatment plant. The effluent flows along the pier into the St. Louis River.
Raw sewage comes in warm to the Western Lake Superior Sanitary District due in part to some large industrial facilities.
That’s fine with the operators of the district’s 35 mgd (average) wastewater treatment plant, which serves Duluth, Minnesota. “Because we are a biological...
