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Sonochemical Degradation of Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoate (PFOA) in Landfill Groundwater: Environmental Matrix Effects

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:CHEest08

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es8013858DOIArticle
http://pubs.acs.org/doi/abs/10.1021/es8013858PublisherArticle
http://pubs.acs.org/doi/suppl/10.1021/es8013858PublisherSupporting Information
ORCID:
AuthorORCID
Park, Hyunwoong0000-0002-4938-6907
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:Copyright © 2008 American Chemical Society. Received May 19, 2008. Revised manuscript received July 18, 2008. Accepted August 7, 2008. Publication Date (Web): 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. Supporting Information Available: (1) Sonochemical degradation kinetics of PFOS and PFOA in landfill groundwater vs MilliQ at 612 kHz. (2) Sonochemical degradation kinetics of PFOS and PFOA under argon vs oxygen vs ozone. (3) Temperature dependence of Kiaw’s and Cp,g’s for the five organic compounds in Table 2. (4) Calibration and quality control results for the LC-MS analysis of PFOS and PFOA. This material is available free of charge via the Internet at http://pubs.acs.org.
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Funding AgencyGrant Number
3MUNSPECIFIED
Issue or Number:21
Record Number:CaltechAUTHORS:CHEest08
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:CHEest08
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:12673
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:19 Dec 2008 04:13
Last Modified:09 Mar 2020 13:19

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