Oxidation of a PAH polluted soil using modified Fenton reaction in unsaturated condition affects biological and physico-chemical properties

Fabien Laurent (1, 2) , Aurélie Cébron (1) , Christophe Schwartz (2) , Corinne Leyval (1)

1 LIMOS - Laboratoire des Interactions Microorganismes-Minéraux-Matière Organique dans les sols
2 LSE - Laboratoire Sols et Environnement

A batch experiment was conducted to assess the impact of chemical oxidation using modified Fenton reaction on PAH content and on physico-chemical and biological parameters of an industrial PAH contaminated soil in unsaturated condition. Two levels of oxidant (H2O2, 6 and 65 g kg(-1)) and FeSO4 were applied. Agronomic parameters, bacterial and fungal density, microbial activity, seed germination and ryegrass growth were assessed. Partial removal of PAHs (14% and 22%) was obtained with the addition of oxidant. The impact of chemical oxidation on PAH removal and soil physico-chemical and biological parameters differed depending on the level of reagent. The treatment with the highest concentration of oxidant decreased soil pH, cation exchange capacity and extractable phosphorus content. Bacterial, fungal. and PAH degrading bacteria densities were also lower in oxidized soil. However a rebound of microbial populations and an increased microbial activity in oxidized soil were measured after 5 weeks of incubation. Plant growth on soil treated by the highest level of oxidant was negatively affected. (C) 2011 Elsevier Ltd. All rights reserved.

Mots clés: biological activity 31 32 33; Fenton; fertility; biological activity; soil pollution; soil; pollution abatement; PAH; oxidation; polycyclic aromatic hydrocarbon

Mots clés: pollution du sol; dépollution

Domaines: Milieux et Changements globaux

Fabien Laurent, Aurélie Cébron, Christophe Schwartz, Corinne Leyval. Oxidation of a PAH polluted soil using modified Fenton reaction in unsaturated condition affects biological and physico-chemical properties. Chemosphere, 2012, 86, pp.659-664. ⟨10.1016/j.chemosphere.2011.11.018⟩. ⟨hal-01486347⟩