title: PAH oxidation in aged and spiked soils investigated by column experiments.
abstract: Soils of former steel-making or coking plants have been contaminated for decades by PAHs. These soils could be cleaned up by In situ chemical oxidation (ISCO) but the low PAH availability may be a drawback. The objective of the present contribution was to study the efficiency of PAH oxidation in two aged soils compared to a spiked soil in dynamic conditions. Column experiments were performed with two oxidants: hydrogen peroxide used in modified Fenton's reaction and activated persulfate. The oxidant doses were moderate to ensure the feasibility of process upscaling. Besides, the availability of PAHs in these soils was measured by extraction with a cyclodextrin. Our results showed that oxidation was limited: the higher PAH degradation rate was 30% with the aged soils and 55% with the spiked one. PAH availability was a parameter explaining these results but no direct correlation was found between PAH extractability by the cyclodextrin and oxidation efficiency. Other parameters were also involved, such as the organic carbon content, the calcite content and the pH. This study was a first achievement before studying the influence of a number of parameters on the efficiency of PAH oxidation in aged soils.
authors.affiliation: Université de Lorraine, Laboratoire Réactions et Génie des Procédés, CNRS UPR3349, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Lemaire
authors.forename: Fabien
authors.initials: F
authors.lastname: Laurent
authors.forename: Corinne
authors.initials: C
authors.lastname: Leyval
authors.forename: Christophe
authors.initials: C
authors.lastname: Schwartz
authors.forename: Michel
authors.initials: M
authors.lastname: Buès
authors.forename: Marie-Odile
authors.initials: MO
authors.lastname: Simonnot
mesh_terms: D052918:Environmental Restoration and Remediation / Q000379:methods*; D008956:Models, Chemical; D010084:Oxidation-Reduction; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000737:chemistry*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D012987:Soil; D012989:Soil Pollutants