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Disponibilité des HAP dans les sols de friches industrielles et influence des conditions rhizosphériques

Abstract : PAHs are present in many industrial wasteland soils. Their remediation using biological techniques remains limited because of their low availability. This work identifies some of the factors controlling this availability in soil and proposes management strategies able to modify it, focusing on plant assisted treatment. First, we have shown that PAHs availability can be estimated by a 30 hours extraction using a Tenax® resin. The analysis of PAHs availability for three wasteland soils showed that the size of black carbon particles, which is the main PAHs reservoir, and the aggregation intensity are the two main availability controlling factors. Laboratory experimentation also showed that this availability can be influenced by rhizosphere parameters. Acidification of a calcareous soil, in dissolving the carbonated cement, can increase PAHs availability by desaggregation. Soil alkalinisation, in decreasing sorption forces between PAHs and the solid matrix, may also increase availability. Citric acid has an effect even more pronounced than the pH alone. Its chelating properties can increase PAHs availability by 40%. Some of these laboratory results have been confirmed by in situ experiments. Indeed, a white lupine culture was able to increase anthracene dissipation for one of the tested wasteland soil over a 5 months period
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Christophe Barnier. Disponibilité des HAP dans les sols de friches industrielles et influence des conditions rhizosphériques. Sciences agricoles. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL102N⟩. ⟨tel-01748747⟩

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