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Contribution of 3-D time-lapse ERT to the study of leachate recirculation in a landfill

Rémi Clément 1, 2 L. Oxarango 3 M. Descloitres 4
3 TRANSPORE - TRANSferts couplés en milieux POREux hétérogènes
LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
4 HYBIS
LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
Abstract : Leachate recirculation is a key process in the operation of municipal waste landfills as bioreactors. It aims at increasing the moisture content to optimise the biodegradation. Because waste is a very heterogeneous and anisotropic porous media, the geometry of the leachate plume recirculation is difficult to delineate from the surface at the scale of the bioreactor site. In this study, 3-D time-lapse electrical resistivity tomography (ERT) was used to obtain useful information for understanding leachate recirculation hydrodynamics. The ERT inversion methodology and the electrode arrays were optimised using numerical modelling simulating a 3-D leachate injection scenario. Time-lapse ERT was subsequently applied at the field scale during an experimental injection. We compared ERT images with injected volumes to evaluate the sensitivity of time-lapse ERT to delineate the plume migration. The results show that time-lapse ERT can accomplish the following: (i) accurately locate the injection plume, delineating its depth and lateral extension; (ii) be used to estimate some hydraulic properties of waste.
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https://hal-insu.archives-ouvertes.fr/insu-00648113
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Submitted on : Monday, December 5, 2011 - 10:50:40 AM
Last modification on : Friday, March 25, 2022 - 3:46:03 PM

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Rémi Clément, L. Oxarango, M. Descloitres. Contribution of 3-D time-lapse ERT to the study of leachate recirculation in a landfill. Waste Management, Elsevier, 2011, 31 (3), pp.457-467. ⟨10.1016/j.wasman.2010.09.005⟩. ⟨insu-00648113⟩

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