Field Demonstration of In Situ Stabilization (ISS) of Per- and Polyfluoroalkyl Substances in Soil with RemBind^®

SYNOPSIS

• A US field study assessed the effectiveness of in-situ soil stabilization (ISS) to immobilize PFAS-impacted soil in a former burn pit at the Cavalier Space Force Station, North Dakota.
• RemBind^® 100X, an aluminum hydroxide/​clay/​carbon fixant, was applied at 3 percent by dry weight to the impacted soil to reduce PFAS leaching from soil to groundwater.
• RemBind^® 100X was distributed and mixed over a 3‑foot vertical zone across a 100- x 100-foot area.
• Monitoring over 19 months using USEPA LEAF methods showed soil leachate concentrations were reduced by at least 95% across a wide range of long- and short-chain PFAS compounds.
• Vadose zone moisture was also monitored using downhole nuclear magnetic resonance (NMR) imaging and in-situ moisture probes, showing that the PFAS immobilization was effective, while still allowing infiltration of precipitation.
• Overall, this study confirms the efficacy of this technology and therefore should be consideration at other similar PFAS-impacted sites.