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Amélioration de la phytoremédiation par Miscanthus x giganteus d’un technosol contaminé construit à partir de sédiments : co-culture avec Trifolium repens L. et bioaugmentation avec des microorganismes endémiques

Abstract : Every year, 50 million cubic meters of sediments are excavated in France. Among them, some are contaminated and solutions must be found to valorize them. In this study, excavated sediments were mixed with the host-site soil, both contaminated with trace metals and PAHs, in order to create a technosol, then treated by phytoremediation with Miscanthus x giganteus (MxG). The objective was to improve the rhizodégradation of PAHs and the phytostabilisation of trace metals as well as to improve the quality of the technosol to increase the productivity of MxG with the aim of valorizing its biomass. Thus, two experiments were carried out. The first associated MxG in co-culture with white clover, and the second combined phytoremediation with a mono- and a co-culture of MxG with bioaugmentation by the endemic hydrocarbonoclast microorganisms of the technosol. According to the results obtained, co-culturing of MxG and white clover appears to be the most note-worthy technique to improve the phytoremediation of PAHs and trace metals and the quality of the technosol compared to phytoremediation assisted by bioaugmentation. In addition, planting white clover for co-culturing is more cost-effective, faster and easier to implement than bioaugmentation. These results will have to be confirmed in situ and other plant species could also be tested in association with MxG in order to combine rhizodegradation with phytoextraction.
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https://hal.univ-lorraine.fr/tel-03230327
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Submitted on : Wednesday, May 19, 2021 - 5:26:27 PM
Last modification on : Thursday, May 20, 2021 - 3:26:08 AM

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  • HAL Id : tel-03230327, version 1

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Laura Wechtler. Amélioration de la phytoremédiation par Miscanthus x giganteus d’un technosol contaminé construit à partir de sédiments : co-culture avec Trifolium repens L. et bioaugmentation avec des microorganismes endémiques. Ecotoxicologie. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0221⟩. ⟨tel-03230327⟩

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