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Wausau updates PFAS treatment: GAC system operating, reuse of reactivated carbon allowed, permit comment period open
Summary
Donahue Engineering said the granular activated carbon PFAS treatment system has operated for more than a year, contractors will replace failing air‑release valves and coat a treatment‑room floor, and DNR allowed reactivated carbon (vendors in Oklahoma and Pennsylvania) that could save about 20% versus new carbon; the draft WPDES permit is open for public comment through Dec. 22, 2025.
Susan from Donahue Engineering told the commission on Dec. 2 that the granular activated carbon (GAC) system installed for PFAS treatment has been operational for more than a year and that most associated construction work is complete. She reported that leaking air‑release valves (24 total across the vessels) were replaced at no cost to the city, though a few valves remain under warranty work.
Susan said the contractor will coat the floor in Structure 120 to protect against…
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