Distribution and fate of perfluorinated compounds (PFCs) in a pilot constructed wetland
Resource
DESALINATION AND WATER TREATMENT, 37(1-3), 178-184
Journal
Desalination and Water Treatment
Pages
178-184
Date Issued
2012
Date
2012
Author(s)
Abstract
Removals of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in pilot-scale constructed wetland were investigated in this study. Phytoextraction by four aquatic plants (Hygrophila pogonocalyx Hayata, Ipomoea aquatic Forssk, Ludwigia (x) taiwanensis and Eleocharis dulcis) and sorption onto soil were determined. Both PFOA and PFOS were fairly phytoextracted by four aquatic plants; the uptake capacity was found in the following order: Hygrophila pogonocalyx Hayata > Ipomoea aquatic Forssk ≈ Ludwigia (x) taiwanensis > Eleocharis dulcis. In the soil sorption experiment, equilibria for PFOA and PFOS were achieved within 6 d; sorption capacity of 2–3 μg/g was observed at the end of the 15 d experiment. Experimental results and literature review suggest that phytoextraction and soil sorption were the most significant mechanisms for PFOA and PFOS disappearance in the pilot-scale constructed wetland, while contributions of biodegradation, photolysis, volatilization and hydrolysis were negligible. © 2012, Taylor & Francis Group, LLC.
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Type
journal article
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