Multimedia Transport of Poly- and Perfluorinated Alkyl Substances (PFAS): Air Emissions to Groundwater-A Case Study

摘要

Poly.. and perfiuoroalkyl substances (PFAS) including perfluorooctanoic acid (PFOA) have been manufactured and used since the 1940s, although have only recently come under enhanced regulatory evaluations. The fate and transport of these fiuorinated hydrocarbon compounds is highly complex, with several pathways for multimedia transport. The carbon-fluorine bond is one of The strongest molecular bonds and results in characteristics that are useful in the production of chemical, electrical, and heat resistant materials, yet also allows PFAS compounds to more readily move through the environment. In some manufacturing processes. PFAS compounds may be released to the environment through air emissions. This presentation will focus on the 3ir emissions pathway including air emissions stack testing, air emissions characterization and air deposition modeling using AERMOD, and subsequent transport to groundwater for both active and decommissioned facilities. Air emissions deposition is shown to be highly sensitive to the assumed particle characteristics of the air emissions as well as to the selected deposition algorithm within AERMOD. The discussion will include identification of issues encountered as part of technical evaluations and approaches to address these technical issues.