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Biodégradation, mobilité et stabilisation du phénanthrène dans deux sols agricoles

Abstract : Phenanthren, a polycyclic aromatic hydrocarbon is an organic pollutant, present in ail the compartments of the environment (air, water and soil). The aim of this thesis is to identify the main processes and factors which control its fa te in controlled laboratory conditions and under natural climatic conditions. The results showed that phenanthren is strongly adsorbed on the agricultural soils studied. Its adsorption seems proportional to the organic matter content and type. This study also shows that soil physical properties (texture, structure, porosity and hydrodynamics) play a considerable role in leaching of phenanthren residues. But this role is strongly influenced adsorption and biodegradation processes. Biodegradation is related to the capacity of micro-organisms to transform phenanthren by co-metabolism. Therefore, the biodegradation of phenanthren depends on the presence of carbon substrates used as co-substrates. This has been shown by stimulation biodegradation through the addition of a "synthetic root exudates" to the soil. The biodegradation by co-metabolism seems to play a key role in diffusion of phenanthrene residues of in immobile water (mesoporale water, microporale water) since polar residues appear. The diffusion phenanthren residues within the intra-aggregate could be a first step to their stabilisation.
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Submitted on : Thursday, March 29, 2018 - 12:35:49 PM
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Samira Amellal. Biodégradation, mobilité et stabilisation du phénanthrène dans deux sols agricoles. Science des sols. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL110N⟩. ⟨tel-01750009⟩



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