Assessment of PAH dissipation processes in large-scale outdoor mesocosms simulating vegetated road-side swales.

Autor: Leroy MC; UMR CNRS 6014 COBRA, Université de Rouen, IUT d'Evreux, 55 rue Saint Germain, 27000 Evreux, France; Unité Agri'Terr, Esitpa - Ecole d'Ingénieurs en Agriculture, 3 rue du Tronquet, 76134 Mont-Saint-Aignan Cedex, France; INFRA Services, 55b rue Gaston Boulet, 76380 Canteleu, France. Electronic address: mcleroy@infraservices.fr., Legras M; Unité Agri'Terr, Esitpa - Ecole d'Ingénieurs en Agriculture, 3 rue du Tronquet, 76134 Mont-Saint-Aignan Cedex, France. Electronic address: mlegras@esitpa.org., Marcotte S; COBRA UMR CNRS 6014, INSA de Rouen, avenue de l'Université, 76800 Saint-Etienne-du-Rouvray, France. Electronic address: stephane.marcotte@insa-rouen.fr., Moncond'huy V; INFRA Services, 55b rue Gaston Boulet, 76380 Canteleu, France. Electronic address: vmoncondhuy@infraservices.fr., Machour N; UMR CNRS 6014 COBRA, Université de Rouen, IUT d'Evreux, 55 rue Saint Germain, 27000 Evreux, France. Electronic address: nadine.merlet@univ-rouen.fr., Le Derf F; UMR CNRS 6014 COBRA, Université de Rouen, IUT d'Evreux, 55 rue Saint Germain, 27000 Evreux, France. Electronic address: franck.lederf@univ-rouen.fr., Portet-Koltalo F; UMR CNRS 6014 COBRA, Université de Rouen, IUT d'Evreux, 55 rue Saint Germain, 27000 Evreux, France. Electronic address: florence.koltalo@univ-rouen.fr.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2015 Jul 01; Vol. 520, pp. 146-53. Date of Electronic Publication: 2015 Mar 24.
DOI: 10.1016/j.scitotenv.2015.03.020
Abstrakt: Biofilters have been implemented in urban areas due to their ability to improve road runoff quality. However, little is known about the role of soil microorganisms and plants on pollutant remediation in planted swales. Therefore, four large-scale outdoor mesocosms were built and co-contaminated with metals and model polycyclic aromatic hydrocarbons (PAHs) (phenanthrene (Phen), pyrene (Pyr) and benzo[a]pyrene (BaP)), to better understand the complex functioning of swale-like environments. Three macrophyte plant species were tested for enhanced remediation of PAHs: Juncus effusus, Iris pseudacorus, Phalaris arundinacea and a grass mix. Long-term dynamics of PAHs in water outflow and soil was studied. Results showed that only 0.07 to 0.22% of total PAHs were released in water outflow after one year. Two years after contamination, soil sample analyses showed a dissipation of 99.6% for Phen and 99.4% for Pyr whatever the mesocosm considered and ranging from 75.5 to 91% for BaP, depending on plant species. Furthermore, dissipation time-courses may be described by a biphasic process. Experiments showed that the grass mix facilitated BaP long-term biodegradation. Grass appeared also to be the best filter for suspended solids because of its dense rhizosphere, which prevents the transfer of BaP to groundwater.
(Copyright © 2015 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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