Les toitures végétalisées, puits et sources d’éléments en traces métalliques

Abstract : Despite the presence of a soil and plants, green roof impact on water quality has proven to be mixed, mainly because there are not designed to purify rainwater. To make suggestions for green roofs suitable for water treatment, it is important to better understand pollutant fluxes in these structures. Dedicated to metals, this thesis is based on two complementary steps : -the study of six green roofs built in 2010 (Nancy, France), thanks to rain and roof waters, plants and materials samplings. -a laboratory characterization of these materials via microscopic scale observations, sorption and lixiviation tests. Material characteristics are mostly favorable to metal storing but several of them have been identified as sources of metals via leaching of fine particles or lixiviation of available ions. Even if they have no specific ability to store metals, plants can have direct and indirect impacts on metal retention. Several technical suggestions are drawn from these scientific results
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Julie Schwager-Guilloux. Les toitures végétalisées, puits et sources d’éléments en traces métalliques. Sciences agricoles. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0073⟩. ⟨tel-01750796⟩

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