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WPCF plans free pilot of bio‑drying to reduce sludge volume as PFAS limits constrain biosolids outlets
Summary
Facing PFAS restrictions on land application, Fairfield WPCF announced a no‑cost pilot of a bio‑drying process that may reduce biosolids moisture and broaden disposal options; staff will return with a proposal and cost estimates.
Fairfield’s wastewater treatment plant will pilot a bio‑drying process intended to reduce the moisture content and volume of composted biosolids, staff told the Water Pollution Control Authority on Jan. 15, a step the plant says could expand disposal options while PFAS contamination limits land‑application outlets.
Staff reported that EPA’s draft risk assessment for PFAS and biosolids has heightened uncertainty about land application of composted sludge. The WPCF currently has approximately 1,000 cubic yards of composted biosolids staged at a Denali We Care facility, with total available storage at that facility of about 2,500 cubic yards; staff said the…
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