Investigation of the release of PAHs from artificially contaminated sediments using cyclolipopeptidic biosurfactants. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Hazardous Materials Année : 2013

Investigation of the release of PAHs from artificially contaminated sediments using cyclolipopeptidic biosurfactants.

Résumé

Polycyclic aromatic hydrocarbons (PAHs) can be preponderant in contaminated sediments and understanding how they are sorbed in the different mineral and organic fractions of the sediment is critical for effective removal strategies. For this purpose, a mixture of seven PAHs was studied at the sediment/water interface and sorption isotherms were obtained. The influence of various factors on the sorption behavior of PAHs was evaluated, such as the nature of minerals, pH, ionic strength and amount of organic matter. Afterwards, the release of PAHs from the sediment by surfactants was investigated. The effectiveness of sodium dodecyl sulfate (SDS) was compared to natural biosurfactants, of cyclolipopeptidic type (amphisin and viscosin-like mixture), produced by two Pseudomonas fluorescens strains. The desorption of PAHs (from naphthalene to pyrene), from the highly retentive kaolinite fraction, could be favored by adding SDS or amphisin, but viscosin-like biosurfactants were only effective for 2-3 ring PAHs desorption (naphthalene to phenanthrene). Moreover, while SDS favors the release of all the target PAHs from a model sediment containing organic matter, the two biosurfactants tested were only effective to desorb the lowest molecular weight PAHs (naphthalene to fluorene).

Domaines

Chimie organique

Dates et versions

hal-00996944 , version 1 (27-05-2014)

Identifiants

Citer

Florence Portet-Koltalo, Mohamed Tahar Ammami, A. Benamar, H. Wang, Franck Le Derf, et al.. Investigation of the release of PAHs from artificially contaminated sediments using cyclolipopeptidic biosurfactants.. Journal of Hazardous Materials, 2013, 261, pp.593-601. ⟨10.1016/j.jhazmat.2013.07.062⟩. ⟨hal-00996944⟩
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