Cheng, Jie and Vecitis, Chad D. and Park, Hyunwoong and Mader, Brian T. and Hoffmann, Michael R. (2008) Sonochemical Degradation of Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoate (PFOA) in Landfill Groundwater: Environmental Matrix Effects. Environmental Science and Technology, 42 (21). pp. 8057-8063. ISSN 0013-936X. https://resolver.caltech.edu/CaltechAUTHORS:20200518-070742483
Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20200518-070742483
Abstract
Perfluorinated chemicals such as perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) are environmentally persistent and recalcitrant to most conventional chemical and microbial treatment technologies. In this paper, we show that sonolysis is able to decompose PFOS and PFOA present in groundwater beneath a landfill. However, the pseudo first-order rate constant for the sonochemical degradation in the landfill groundwater is reduced by 61 and 56% relative to MilliQ water for PFOS and PFOA, respectively, primarily due to the presence of other organic constituents. In this study, we evaluate the effect of various organic compounds on the sonochemical decomposition rates of PFOS and PFOA. Organic components in environmental matrices may reduce the sonochemical degradation rates of PFOS and PFOA by competitive adsorption onto the bubble−water interface or by lowering the average interfacial temperatures during transient bubble collapse events. The effect of individual organic compounds depends on the Langmuir adsorption constant, the Henry’s law constant, the specific heat capacity, and the overall endothermic heat of dissociation. Volatile organic compounds (VOCs) are identified as the primary cause of the sonochemical rate reduction for PFOS and PFOA in landfill groundwater, whereas the effect of dissolved natural organic matter (DOM) is not significant. Finally, a combined process of ozonation and sonolysis is shown to substantially recover the rate loss for PFOS and PFOA in landfill groundwater.
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Additional Information: | © 2008 American Chemical Society. Received May 19, 2008. Revised manuscript received July 18, 2008. Accepted August 7, 2008. Publication Date: September 23, 2008. We thank 3M for the financial support and the Caltech Environmental Analysis Center (Dr. Nathan Dalleska) for technical assistance in sample analysis. | ||||||
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Issue or Number: | 21 | ||||||
Record Number: | CaltechAUTHORS:20200518-070742483 | ||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20200518-070742483 | ||||||
Official Citation: | Sonochemical Degradation of Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoate (PFOA) in Landfill Groundwater: Environmental Matrix Effects. Jie Cheng, Chad D. Vecitis, Hyunwoong Park, Brian T. Mader, and Michael R. Hoffmann. Environmental Science & Technology 2008 42 (21), 8057-8063; DOI: 10.1021/es8013858 | ||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
ID Code: | 103253 | ||||||
Collection: | CaltechAUTHORS | ||||||
Deposited By: | Tony Diaz | ||||||
Deposited On: | 18 May 2020 15:45 | ||||||
Last Modified: | 18 May 2020 15:45 |
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