In a plant that uses no chemicals, it’s “chemistry” that matters most in award-winning performance. The Kalispell (Mont.) Wastewater Treatment Plant ranks as one of the top 10 biological nutrient removal (BNR) plants in the country and perhaps the world. Since 1998, an impressive record, including an effluent phosphorus average of 0.12 mg/l, has netted operational honors from the U.S. EPA (2007 Clean Water Act Recognition Award) and the Montana Water Environment Association. Even further, the EPA features Kalispell as an example of exemplary performance in its reference manual on BNR plants (EPA 832-R-08-006, September 2008), leading to inquiries on
