Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/108082
Title: Sorption of perfluoroalkyl substances in sewage sludge
Author: Milinovic, Jelena
Lacorte i Bruguera, Sílvia
Rigol Parera, Anna
Vidal Espinar, Miquel
Keywords: Llots de depuradora
Absorció
Contaminants persistents
Sewage sludge
Absorption
Persistent pollutants
Issue Date: 16-Jan-2016
Publisher: Springer Verlag
Abstract: The sorption behaviour of three perfluoroalkyl substances (PFASs) (perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorobutanesulfonic acid (PFBS)) was studied in sewage sludge samples. Sorption isotherms were obtained by varying initial concentrations of PFOS, PFOA and PFBS. The maximum values of the sorption solid-liquid distribution coefficients (Kd,max) varied by almost two orders of magnitude among the target PFASs: 140-281 mL g−1 for PFOS, 30-54 mL g−1 for PFOA and 9-18 mL g−1 for PFBS. Freundlich and linear fittings were appropriate for describing the sorption behaviour of PFASs in the sludge samples, and the derived KF and Kd,linear parameters correlated well. The hydrophobicity of the PFASs was the key parameter that influenced their sorption in sewage sludge. Sorption parameters and log(KOW) were correlated, and for PFOS (the most hydrophobic compound), pH and Ca + Mg status of the sludge controlled the variation in the sorption parameter values. Sorption reversibility was also tested from desorption isotherms, which were also linear. Desorption parameters were systematically higher than the corresponding sorption parameters (up to sixfold higher), thus indicating a significant degree of irreversible sorption, which decreased in the sequence PFOS > PFOA > PFBS
Note: Versió postprint del document publicat a: https://doi.org/10.1007/s11356-015-6019-9
It is part of: Environmental Science and Pollution Research, 2016, vol. 23, num. 9, p. 8339-8348
Related resource: https://doi.org/10.1007/s11356-015-6019-9
URI: http://hdl.handle.net/2445/108082
ISSN: 0944-1344
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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