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Pima County biogas plant returns to limited service after rupture and membrane fouling; contractor faces legal challenge
Summary
County staff told the advisory committee Dec. 18 that the wastewater biogas plant was offline for months after a ruptured vessel and unexpected membrane fouling; membranes were replaced and the system restarted on day shift while operators are retrained. Staff said a legal challenge against the contractor is pending over installation and performance.
Pima County staff reported Dec. 18 that the wastewater biogas system is back in limited service after a multi‑month outage caused by equipment failures and defective contractor work.
During a director update, staff described a safety incident in which a cast‑iron vessel ruptured while nitrogen was being introduced during maintenance; no injuries were reported. Forensics found the plant’s membranes…
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