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Etude multi-echelles des réactions de dénitrification dans les aquifères hétérogènes: Approches expérimentales de l'influence des écoulements sur la réactivité biogéochimique

Abstract : Impact of physical heterogeneity on solute transport in groundwater is well known. However, the links with biogeochemical processes are more complex and create non linear processes dependent on the media's structure and the reaction kinetics. Some reactions such as denitrification are controlled by biological activity. The influence of transport properties on these processes is not clearly known. This study aims at characterizing the influence of flow velocity on reactivity at different scales. At the scale of a 2 mm diameter tube, where a denitrification reaction occurs, experiments shows a biologically controlled reaction which becomes with time physically controlled. Diffusion properties inside the developed biofilm seem to explain the observed concentrations. In porous media, biotite-related denitrification has been observed. At field scale, push-pull test allowed to quantify the effect of reaction kinetics on nitrate degradation and nitrous oxide formation. This field information allows assessing the influence of this reaction at field scale. This work improves the knowledge on reactivity in groundwater at multi-scales.
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https://tel.archives-ouvertes.fr/tel-00593708
Contributor : Isabelle Dubigeon <>
Submitted on : Tuesday, May 17, 2011 - 10:23:31 AM
Last modification on : Friday, April 5, 2019 - 8:23:20 PM
Long-term archiving on: : Thursday, August 18, 2011 - 2:22:55 AM

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  • HAL Id : tel-00593708, version 1

Citation

Alexandre Boisson. Etude multi-echelles des réactions de dénitrification dans les aquifères hétérogènes: Approches expérimentales de l'influence des écoulements sur la réactivité biogéochimique. Hydrologie. Université Rennes 1, 2011. Français. ⟨tel-00593708⟩

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