Innovative Technology for Destruction PFAS “Forever Chemicals”

A Warren Distinguished Lecture with

Timothy J. Strathmann
Colorado School of Mines, Department of Civil and Environmental Engineering

Forever No More: Introduction of an Innovative Technology for Destruction PFAS “Forever Chemicals”

Abstract
Timothy Strathmann describes the recent invention and development of a new technology for destruction of per- and polyfluoroalkyl substance (PFAS) “forever chemicals” at the Colorado School of Mines. The critical importance of technologies for cost-effective destruction of PFAS is growing due to recent US EPA proposals to designate PFAS as hazardous substances under Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) and institute strict drinking water regulations. The technology Strathmann and his colleagues invented, Hydrothermal ALkaline Treatment (HALT), applies elevated temperatures (250 – 350°C) to liquid water or wet solid mixtures amended with low-cost alkali (e.g., NaOH) to promote destruction and defluorination of PFAS. HALT is ideal for treating high moisture content wastes (e.g., liquid concentrates, wet soils, biosolids) contaminated with PFAS because input energy requirements are much lower than for competing thermochemical technologies (e.g., incineration, gasification). Strathmann discusses research revealing the underlying mechanisms for PFAS destruction by HALT and recent work demonstrating treatment of the full spectrum of PFAS identified in aqueous film-forming foam (AFFF)-impacted water and soil samples, as well as liquid and solid concentrate wastes derived from other treatment processes (e.g., GAC adsorption, foam fractionation). Strathmann also highlights ongoing efforts to commercialize HALT with their industry partner Aquagga. 

Speaker
Timothy Strathmann is a Professor in the Department Civil and Environmental Engineering at the Colorado School of Mines. His research aims to develop more sustainable technologies for water treatment and waste valorization. Most recently, his research program has focused on developing innovative technologies for treatment of per- and polyfluoroalkyl substances (PFAS), including being the lead inventor of the hydrothermal alkaline treatment technology for PFAS (HALT-PFAS). Dr. Strathmann is the recipient of a National Science Foundation CAREER Award, and his current research has been sponsored by DoD-SERDP/ESTCP, NSF, and the Semiconductor Research Corporation (SRC). Dr. Strathmann’s formal training includes a Ph.D. in environmental engineering from Johns Hopkins, BS and MS degrees from Purdue, and postdoctoral training at Princeton.