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City staff outline biosolids operations, sampling and PFAS testing in public briefing
Summary
A city presentation explained how Spokane produces and land-applies Class B biosolids, described sampling and buffering protocols, noted no recorded illnesses associated with the program, and said early PFAS sampling has measured about 50 parts per billion in plant biosolids; staff said they are pursuing additional source-control and grant-funded testing.
City wastewater staff gave a technical presentation to the board on April 1 explaining the city's biosolids program and the safeguards used in land application.
The presenter described biosolids as an organic, processed product of wastewater treatment — not raw human waste — and walked the board through the treatment chain from headworks through primary and secondary clarifiers to membrane filtration and anaerobic digesters. The presenter said Spokane produces Class B biosolids and explained the Class A/Class B distinction: Class A processes kill pathogens to a…
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