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Full-Text Articles in Physical Sciences and Mathematics
Persistence And Mitigation Of Pfas Within Concrete Stormwater Drainage Infrastructure, Jason R. Mcdonald
Persistence And Mitigation Of Pfas Within Concrete Stormwater Drainage Infrastructure, Jason R. Mcdonald
Theses and Dissertations
The persistence, fate, and transport of per- and poly-fluoroalkyl substances, which have been shown to have adverse effects on human health, have been previously studied in environmental media such as soils and groundwater. This study investigates concrete, a medium that is rarely studied but frequently present in instances where PFAS originating from AFFF releases and spills have occurred. Used heavily throughout aviation firefighting, AFFF poses environmental hazards due to the length of PFAS degradation and toxicological implications, thus its classification as a forever chemical. From the very limited reports to date, studies have suggested very slow release from concrete, potentially …
Fluid Dynamics Modeling For Per- And Polyfluoroalkyl Substances Removal In Legacy Fire Suppression Systems, Jacob G. Spaulding
Fluid Dynamics Modeling For Per- And Polyfluoroalkyl Substances Removal In Legacy Fire Suppression Systems, Jacob G. Spaulding
Theses and Dissertations
Legacy per- and polyfluoroalkyl substances (PFASs) exist in the form of aqueous film-forming foams within hangar fire suppression systems throughout the country, posing a threat to both surrounding environments as well as local populations. The United States (US) Department of Defense (DoD), in conjunction with the US Environmental Protection Agency (EPA), is investigating best practices to flush out existing contaminants prior to disposal and replacement with a less environmentally harmful replacement. While current procedures dictate a triple rinse of the entire system to yield contaminant levels acceptable to the DoD, the practice has never truly been tested. Designed as a …
Removal Of Perfluorinated Compounds From Post-Emergency Wastewater By Advanced Oxidation Process And Granular Activated Carbon Adsorption, Sean M. Dyson
Theses and Dissertations
This research presents a novel approach to remove per- and polyfluoroalkyl substances (PFAS) from aqueous film-forming foam (AFFF) impacted wastewater with high (~100 mg/L) total organic carbon (TOC) concentrations. A treatment-train process was investigated involving an ultraviolet (UV)/hydrogen peroxide (H2O2) advanced oxidation process (AOP) followed by filtration using Calgon Filtrasorb® 600 (F600) granular activated carbon (GAC). UV/H2O2 AOP experiments were conducted to determine whether TOC concentrations could be reduced as a pre-treatment step before filtering the water with F600-GAC. Results showed using UV/H2O2 AOP reduced TOC in solution by > 98% (< 2 mg/L down from 99.1 mg/L). Reducing TOC concentrations was achieved by using a 250 mg/L H2O2 …