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Modélisation de la production de lixiviat en centre de stockage de déchets ménagers

Abstract : Forecasting the quantity of leachate is a major issue in short and long term management of solid waste landfill cells, for environment protection as well as for financial aspects. We tried to assess the water budget at the scale of a landfill cell in order to estimate the water fluxes inside wantes and at atmospheric interface (rainfall, runoff, evaporation or evapotranpiration when the cell is covered with earth and vegetation). A cell was equipped for the monitoring of different tenus of the water budget, in a quite comprehensive manner. Time domain reflectometry probes were used for soil and waste moi sture measurement. Temperatures were also monitored in order to assess their influence on flows. This experimental approach produced new results about thermal behaviour of solid waste and values oftemperature gradients. The monitoring enabled to quantify the infiltration through the cover. In spite of some sensors ill operating, we obtained a fairly good qualitative representation of the water content variations at the botttom of the cell. A method for estimation of evaporation from solid waste exposed to atmosphere was proposed. Modelling of water and heat fluxes within solid waste was developped. The coupled model was able to simulate properly the water content variations of the cover, and the leachate height variations at the bottom. The interpretation of model results shows the influence of temperature, and the existence of a thermic « banier » limiting the updown water fluxes.
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https://hal.univ-lorraine.fr/tel-01749793
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Gaël Bellenfant. Modélisation de la production de lixiviat en centre de stockage de déchets ménagers. Autre. Institut National Polytechnique de Lorraine, 2001. Français. ⟨NNT : 2001INPL587N⟩. ⟨tel-01749793⟩

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