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Poster communications

Effect of a cyclolipopeptidic biosurfactant on pahs sorption by sediments

Abstract : Polycyclic aromatic hydrocarbons (PAHs) are toxic contaminants found on sediments and understanding how they are sorbed in the different mineral and organic fractions of the sediment is critical for performing effective removal strategies. Then fifteen PAHs were studied and their sorption isotherms could be simultaneously obtained, thanks to a chromatographic method combined to a trace concentration procedure. The influence of various factors on the sorption behavior, such as pH, ionic strength and amount of organic matter could be evaluated. Among sediment decontamination methods, electrokinetic (EK) remediation is a promising one but is not adapted for lipophilic nonionic contaminants. Then, the mobilization of PAHs from the sediment to the aqueous fluid by an anionic surfactant was investigated, this step being essential before PAHs electromigration by an EK process. This work demonstrates that PAHs could be desorbed from the highly retentive sediment, even when it is composed of a high fraction of kaolinite or organic matter. An original cyclolipopeptidic anionic biosurfactant (amphisin), produced by Pseudomonas Fluorescens DSS73, was used for this purpose and was compared to the conventional synthetic anionic surfactant sodium dodecyl sulfate (SDS).
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Poster communications
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02557889
Contributor : Florence Koltalo <>
Submitted on : Wednesday, May 6, 2020 - 11:50:08 AM
Last modification on : Thursday, July 2, 2020 - 3:29:37 AM

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  • HAL Id : hal-02557889, version 1

Citation

Florence Portet-Koltalo, Ammami Tahar, Benamar Ahmed, Duclairoir-Poc Cécile, Franck Le Derf. Effect of a cyclolipopeptidic biosurfactant on pahs sorption by sediments. European Meeting on Environmental Chemistry (EMEC, 12, 2011), Dec 2011, Clermont-Ferrand, France. ⟨hal-02557889⟩

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