A renewable natural gas plant at the 91st Avenue Wastewater Treatment Plant in Phoenix completes the circle of reusable byproducts for Arizona’s largest clean-water facility.
The 145 mgd average (230 mgd design) plant has long claimed beneficial uses for 100% of its effluent and biosolids. All that goes to the landfill is grit and headworks screenings. The effluent is used for irrigation, supplying the Tres Rios Wetland, and for cooling the nuclear reactors at the Palo Verde Generating Station. Anaerobically digested and dried biosolids are land-applied to crops such as hay and cotton.
Only the biogas remained as an unrecovered resource.
