Ecodynamique des Hydrocarbures Aromatiques Polycycliques (HAP) et des communautés microbiennes dans des sols à pollution mixte (HAP, métaux) avant et après traitement par biopile et par désorption thermique : influence de la rhizosphère et de la mycorhization

Abstract : Former industrial multicontaminated soils (PAH, MTE) pose problems for their treatment because remediation techniques (e.g. biopile, thermal desorption) do not eliminate completely pollutants and because its could be affected physicochemical and biological soil properties. Phytoremediation technologies could be a strategy for polluted soils restoration. The aims of this study were (i) to characterize the biological properties of contaminated soils before and after remediation treatments (biopile and thermal desorption), (ii) to investigate the effect of mycorrhizal fungi and nutrients on the growth of alfalfa on contaminated soils before and after remediation treatments, (iii) to study the dynamics of the pollutants in mycorrhizal and nonmycorrhizal plant rhizosphere and to characterize the microbial communities. We used industrial soils contaminated with PAH and to a lesser extent with MTE. .In pot experiments, the soils were inoculated or not with AM fungi and fertilised or not. These experiments showed that the survival and the growth of the plant on the contaminated and treated soils were dependent on the mycorhization. The PAH contents and availability in the rhizosphere decreased in these experiments though the AM fungi had no effect on the PAH contents. Various techniques (enumeration, PCR-TTGE, real-time PCR) showed the impact of the remediation treatments on the bacterial and the fungal population in soils. These results highlight the necessity to know the physico-chemical and the biological characteristics of the contaminated soils and the treated soils. The plant-MA fungi association are decisive for the remediation and the restoration of the soils properties.
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Marie-Paule Norini. Ecodynamique des Hydrocarbures Aromatiques Polycycliques (HAP) et des communautés microbiennes dans des sols à pollution mixte (HAP, métaux) avant et après traitement par biopile et par désorption thermique : influence de la rhizosphère et de la mycorhization. Biologie végétale. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10121⟩. ⟨tel-01748240⟩

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