The City of Flagstaff operates two water reclamation plants, Wildcat Hill and Rio de Flag, which utilize solar energy to reduce their energy costs. The Wildcat Hill plant is an advanced wastewater treatment facility that can treat 6 million gallons per day and generates methane gas from the treatment process to power equipment. The Rio de Flag plant, located near the center of Flagstaff, uses the Bardenpho process to reduce the nitrogen content in wastewater and employs ultraviolet radiation for disinfection.
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