Field-Scale Demonstration of PFAS Leachability Following In Situ Soil Stabilization

SYNOPSIS

• Several adsorbents were tested at bench-scale for their ability to immobilize PFAS in soil collected from a US site.
• Based on the bench-scale trials, Rembind was 1 of only 2 adsorbents selected for further field scale trials.
• Field-scale trials consisted of mixing the adsorbents in situ at various dosage rates simultaneously with Portland cement into a number of test pits at a US Government site.
• Five separate monitoring events included two to three sample cores collected from each test pit for United States Environmental Protection Agency (USEPA) Method 1315 leaching assessment.
• Bench-scale and field-scale data were in good agreement and demonstrated >99% decrease in total PFAS leachability as confirmed by the total oxidizable precursor assay, strongly supporting the chemical stabilization of PFAS.
• To date, monitoring of the test pits shows that the immobilization is very stable for at least 2.5 years, which paves the way for the consideration of immobilization as a viable and sustainable PFAS soil remediation solution.