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Flagstaff examines lower-cost solids-handling at Rio de Flag; dryer option may cut costs and hauling
Summary
After digesters proved cost‑prohibitive, Flagstaff wastewater staff presented a dewatering-and-drying alternative at Rio de Flag that would produce a dried, lower‑volume biosolid and reduce solids sent to Wildcat Hill.
City wastewater staff presented alternatives on May 15 for handling solids at the Rio de Flag Reclamation Facility, including a lower-footprint dewatering-and-drying technology intended to reduce the solids delivered to the Wildcat Hill plant and to produce a dried, Class A biosolid product.
Troy Dagonard, wastewater treatment manager, summarized the city’s multi-year design effort to add solids handling at Rio. The initial design—two digesters and a dewatering facility—produced cost estimates approaching $60 million. Staff pared scope to one digester plus dewatering with a roughly $36 million estimate, but the rescope remained over budget. "Cost models came in at roughly $36,000,000," Dagonard said, and staff then evaluated alternative technologies.
Why it matters: Wildcat Hill’s solids loading has increased with changing flows and conservation trends; removing roughly 11,000 pounds per day of solids from the…
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