Side-by-Side Evaluation of Field-Scale Treatment of PFAS-Impacted Sediments: Smoldering, Thermal Desorption, and Soil Washing Followed by SCWO, HALT, and UV/SGM (Web-based, On Demand)
This presentation will spotlight a comprehensive evaluation of multiple treatment technologies through side-by-side field demonstrations designed to remove and destroy PFAS in impacted sediments and ponded stormwater. Sediment treatment technologies included smoldering combustion, thermal desorption, and sediment washing using high-shear mixing with an ethanol co-solvent. Liquid generated during sediment washing was combined with ponded stormwater and treated using surface active foam fractionation (SAFF). Concentrated PFAS foam fractionate was subsequently treated using hydrothermal alkaline treatment (HALT), supercritical water oxidation (SCWO), and ultraviolet-activated photocatalytic silica-based granular media (UV/SGM). This presentation will discuss treatment performance, PFAS removal and destruction, residual PFAS leachability, potential air emissions, field implementation considerations, and costs. Results provide DoW decision-makers with data needed to evaluate treatment options and support more informed, scalable, and cost-effective remediation of PFAS-impacted sediments at military installations.