2010 No. 1 15 [ O N S I T E] People who live in northwestern St. Louis County in Missouri are finding that the air smells a little fresher these days. For that, they can thank the $40 million upgrade and expansion recently completed at the nearby Missouri River Treatment Plant, one of seven wastewater treatment plants operated by the St. Louis Metropolitan Sewer District (MSD). Odor control, however, was just one of several challenges

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