When the city of El Dorado, Kan., needed to upgrade its trickling filter/rotating biological contactor plant to meet ammonia limits and deal with high rain events and more stringent nutrient removal specifications, plant managers devised a unique solution.
Started up in February 2007, a new 3 mgd (design) wetlands/activated sludge plant produces exceptionally high-quality effluent and Class A biosolids. The biosolids are applied to neighboring city-owned farmland, and a share of the value of the farmer’s yield is returned to the treatment plant.
The El Dorado Wetlands and Water Reclamation Facility has produced effluent far better than permit limits, and the agreement
