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Showing 1 to 14 of 14 for “"AFFF"”.
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Extraction, transport, and transformation of poly- and perfluoroalkyl substances in soils impacted by aqueous film-forming foam
… products. Use of aqueous film-forming foams (AFFF) at military bases and airports is one significant source of PFAS contamination to groundwater and communities. AFFF formulations are composed of diverse PFAS classes, including anionic, zwitterionic, and cationic structures. Many of the …
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Factors Affecting Fuel Transport of Firefighting Foam
Aqueous film-forming foam (AFFF) used for fuel firefighting contains polyfluoroalkyl substances (PFAS) that have been identified as environmentally persistent and bioaccumulative resulting in phase out of AFFF. Currently, there are no environmentally friendly foams available that can perform at the …
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Photochemical processes in engineered aquatic systems for remediation of per- and polyfluoroalkyl substances and algae cultivation
… are a component in aqueous film-forming foam (AFFF) used in fire-training activities and have caused widespread contamination across the U.S. While recent studies have shown promise in UV-sulfite treatment of individual PFASs, little is known of treatment in PFAS mixtures found in AFFF-impacted …
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Adsorption of Single and Multi-Component Per-and Polyfluoroalkyl Substances (PFAS) at Air-Water Interfaces
… using a commercial aqueous film-forming foam (AFFF). The results of these experiments showed that at low concentrations, perfluorooctanesulfonic acid (PFOS) adsorption was better predicted by the Freundlich isotherm than the Langmuir isotherm. Varying pore-water velocity revealed that lower …
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Evaluation of Nitrification Inhibition Using Sequencing Batch Reactors and BioWin Modeling, and the Effect of Aqueous Film Forming Foam on Biological Nutrient Removal
… C was spiked with aqueous Film Forming Foam (AFFF) such as that used in methanol feed facility fire suppression systems, while reactor D was left as a control. AFFF was initially added at a concentration of 20 ppm with no effect on either nitrification or denitrification performance. When …
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Per- and Polyfluoroalkyl Substances (PFAS) in Air, Water, and Soil and Their Impact on Air Quality
… sources in precipitation and five in water, with AFFF and food packaging as major contributors. Chapter 3 revealed distinct PFAS signatures in soil and rainfall, with soils dominated by long-chain PFCAs (C10–C12, 98% of ΣPFCAs) and PFDoA as the primary congener, while rainwater showed short-chain …
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Multiscale Investigation of Surfactant-Driven Fuel Resistance
Aqueous film-forming foams (AFFF) are widely recognized for their exceptional performance in suppressing flammable liquid fires. Their effectiveness stems from the unique ability of fluorinated surfactants, including per- and polyfluoroalkyl substances (PFAS), to rapidly spread across fuel surfaces …
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Understanding the nonaqueous partitioning of per- and poly-fluoroalkyl substances (PFAS)
… associations with aqueous film-forming foam (AFFF), landfills, and wastewater treatment plants (WWTP). The limited PFAS treatment technologies in WWTPs contribute to high levels of PFAS in water effluent and biosolids, leading to the re-spreading of contamination. PFAS retention in biosolids …
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Evaluation of stormwater control measures for the removal and fate of legacy and emerging contaminants
… airport affected by aqueous film forming foam (AFFF), the study estimated the required adsorber bed volumes, sorbent masses, and capital costs for different sorbent materials. Results showed that sorbent selection must be tailored to site-specific conditions in order to achieve compliance while …
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Synthesis and Characterization of Wholly Aromatic, Water-Soluble Polyimides and Poly(amic acid)s Towards Fire Suppression Foams
… suppression foams. Aqueous film-forming foams (AFFFs) are regularly sought when engaging liquid fuel (gasoline, jet fuel) fires. AFFFs utilize perfluorinated compounds (PFCs) like perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA), which exhibit toxicity, bioaccumulation, and …
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Molecular cloning, peptide synthesis and bioactive assessment of a skin defensive peptide, QUB-3117 from the skin secretion of Rana schmackeri
Anurans are the largest group of amphibian and widely distributed in the world. The skin secretion of anurans has been considered as potential candidate for drug development due to its crucial role in protecting from environment. To date, abundant biologically active compounds have been …
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Evaluating the impact of higher education on income poverty in South Africa
In South Africa, primary and secondary education is widely accessible to all individuals, thanks to the South African Schools Act of 1996 (Act No. 84 of 1996), which established education as a fundamental right for everyone and made it compulsory for children aged 7 to 14 years. However, higher …
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Mantenedores de espacio. Investigación documental.
La presente investigación de tipo documental se ha realizado cuidadosamente sobre aspectos relacionados a los aparatos mantenedores de espacio tratando de incorporar en ella todos los elementos posibles relacionados con su aplicación clínica y científica. Incluyendo la descripción de cada uno de …
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The role of DEAD-box helicase 1 in humoral immune responses
A key characteristic of humoral immune responses is the ability of B-cells to recognise an endless array of antigens through their immunoglobulin (Ig) genes and secret these as soluble antibodies to help combat invading pathogens. Primary diversification occurs through VDJ recombination during …