An upgrade converted the 200,000 gpd New Castle (Colo.) activated sludge wastewater treatment plant to a 600,000 gpd Kruger AnoxKaldnes HYBAS system (integrated fixed-film activated sludge or IFAS) serving 1,600 homes and averaging 235,000 gpd.
Operators expected an increase in energy demand when the plant went online in September 2009, but the actual numbers surprised them. "We were primed and ready for some vehicle to help us reduce our energy consumption," says lead operator Eli Jennings.
Garfield Clean Energy (GCE)/CLEER, a nonprofit energy consulting firm in Carbondale, provided a solution as part of a
