PFAS Pilot Study George Walters, a supervisory environmental engineer at Wright-Patterson Air Force Base, Ohio, and Dr. Shangtao Liang, discuss a process being used to remediate per- and polyfluoroalkyl substances, or PFAS, from groundwater near the base's fire training area, Sept. 29, 2020. SHARE IMAGE: Download Image: Full Size (0.1 MB) Tags: PFAS Photo By: Ty Greenlees, Air Force VIRIN: 200929-F-AU145-1256.JPG Photo Gallery