Understanding leachate flow in municipal solid waste landfills by combining time-lapse ERT and subsurface flow modelling – Part I: Analysis of infiltration shape on two different waste deposit cells

Audebert, Marine; Clément, Rémi; Moreau, Sandra; Duquennoi, C.; Loisel, S.; Touze-Foltz, Nathalie

doi:10.1016/j.wasman.2016.04.006

Cited by 33 publications

(23 citation statements)

References 38 publications

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“…Various applications of the ERT method have been presented over the past two decades for: hydrogeological studies (Clément et al, 2014; Hübner et al, 2017, 2015; Nimmer et al, 2008), agricultural applications (Cassiani et al, 2012; Michot et al, 2003; Uhlemann et al, 2016b), ground water resources (Binley et al, 2002; Kuras et al, 2009), tracer and contaminant plume monitoring (Audebert et al, 2016a, 2016b; Koestel et al, 2009, 2008; Kuras et al, 2016, 2014; Power et al, 2014; Rucker et al, 2011; Wilkinson et al, 2010), geotechnical applications (Chambers et al, 2014, 2015; Uhlemann et al, 2016a, 2017) and mining environmental issues (Anterrieu et al, 2010; Dimech, 2018; Dimech et al, 2018, 2017; Intissar, 2009; Power et al, 2018).…”

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confidence: 99%

Three‐Dimensional Time‐Lapse Geoelectrical Monitoring of Water Infiltration in an Experimental Mine Waste Rock Pile

Dimech

Chouteau

Aubertin

et al. 2019

Vadose Zone Journal

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Core Ideas 3D time‐lapse ERT is used to monitor water infiltration for mining environmental issues. Geoelectrical images provide information where no hydrogeological data is available. Water resistivity must be taken into account to understand bulk resistivity variations. Electrical resistivity of water is used as a tracer to reconstruct water infiltration. Infiltration model integrating both hydrogeological and geophysical data is proposed. Open‐pit mines often generate large quantities of waste rocks that are usually stored in waste rock piles (WRPs). When the waste rocks contain reactive minerals (mainly sulfides), water and air circulation can lead to the generation of contaminated drainage. An experimental WRP was built at the Lac Tio mine (Canada) to validate a new disposal method that aims to limit water infiltration into reactive waste rocks. More specifically, a flow control layer was placed on top of the pile, which represents a typical bench level, to divert water toward the outer edge. Hydrogeological sensors and geophysical electrodes were installed for monitoring moisture distribution in the pile during infiltration events. A three‐dimensional (3D) time‐lapse hydrogeophysical monitoring program was conducted to assess water infiltration and movement. Readings from the 192 circular electrodes buried in the WRP were used to reconstruct the 3D bulk electrical resistivity (ER) variations over time. A significant effort was devoted to assessing the spatiotemporal evolution of water ER because the bulk ER is strongly affected by water quality (and content). The water ER was used as a tracer to monitor the infiltration and flow of resistive and conductive waters. The results indicate that the inclined surface layer efficiently diverts a large part of the added water away from the core of the pile. Local and global models of water infiltration explaining both bulk and water ER variations are proposed. The results shown here are consistent with hydrogeological data and provide additional insights to characterize the behavior of the pile.

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confidence: 99%

Three‐Dimensional Time‐Lapse Geoelectrical Monitoring of Water Infiltration in an Experimental Mine Waste Rock Pile

Dimech

Chouteau

Aubertin

et al. 2019

Vadose Zone Journal

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“…The variations of water content induced by leachate injection at the top and by leachate drainage at the bottom are too difficult to describe. Leachate flows can be very different within the waste mass and follow preferential pathways according the micro and macro porosity distribution in the medium [39]. The same applies to biogas flows generated by waste biodegradation which cannot be modelled and for these reasons, both the liquid and gas circulations are therefore ignored.…”

Section: Governing Equationmentioning

confidence: 99%

Six Years Temperature Monitoring Using Fibre-Optic Sensors in a Bioreactor Landfill

Moreau¹,

Jouen²,

Grossin-Debattista³

et al. 2019

Geosciences

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Temperature is a relevant physical parameter to monitor the biodegradation phases of waste mass. Irstea and the landfill operator SAS Les Champs Jouault have been collaborating since 2011 to study the temporal evolution and the spatial distribution of temperature in a municipal solid waste cell. Using distributed temperature sensing technology, optical fibres were installed in waste mass composed of household waste and industrial waste at different depths during the landfilling period. Temperature distributions were studied from 2012 until 2018 and the same evolutions are observed everywhere with more or less important amplitude variations depending on the location of the measurement point. When landfilled, the waste is at ambient temperature and a significant increase is observed the following year due to the exothermic impact of the aerobic biodegradation phase before a slower decrease during the anaerobic biodegradation phase over several years. Thermal parameters of the waste mass and the surrounding soil, as well as the heat generation function, are calculated using numerical simulation to reproduce the temperature evolution and its spatial distribution. The study of the long-term temperature evolution makes it possible to evaluate the favourable period during which the deposit cell will be in optimal conditions to promote the biodegradation waste processes.

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“…The residual water content of the waste material was higher than for inert sediment composing the landfill cover. It was set to 0.15, as proposed by Audebert et al (2016a) from a study of Stoltz et al (2012) for similar conditions. For the waste, we set the permeability at saturation at 10 -4 m/s but it had no impact on the water flow anyhow, since no water infiltrated into this zone during the simulation.…”

Section: Simulation Of Simplified Vadose Zone Water Dynamics In a Virmentioning

confidence: 99%

“…For example, Clément et al (2011) defined a percentage change threshold representative of the physical extension of a leachate plume without using any petrophysical relationship. The plume geometry can be used to deduce the anisotropy of water flow (Audebert et al, 2016a) or to calibrate the retention capacity, the permeability at saturation and its anisotropy in hydrogeological unsaturated flow models (Audebert et al, 2016b). In other Hydrol.…”

Section: Introductionmentioning

confidence: 99%

The effect of initial water distribution and spatial resolution on the interpretation of ERT monitoring of water infiltration in a landfill cover

Dumont

Pilawski

Hermans

et al. 2018

Preprint

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Abstract. In a landfill, the biodegradation of the organic fraction of the waste is driven by its moisture. Once the waste dump is covered, the infiltration through the cover layer is a source of additional water. In this study, the changes in water content in a landfill cover layer were investigated with long time-lapse electrical resistivity tomography (ERT) profiles. Measurements carried out during a rainfall event allowed the detection of zones with large infiltration events. We addressed all interpretation limits inherent to such a large scale, low resolution investigation with the use of synthetic modelling. Firstly, the smoothed resistivity changes distribution failed to detect small infiltration areas and induced a misestimation of the infiltration depth and volume in large infiltration zones. Secondly, when the background water content is not homogeneous, relative changes, as commonly used in literature, reflect both the background moisture distribution and the monitored changes. Thirdly, the temperature and pore fluid conductivity distribution are needed to compute the absolute water content changes. The latter better reflects the infiltration pattern. Lastly, rain water infiltration results in pore water dilution. When the dilution effect is not considered, the infiltrated volume is underestimated. This approach enabled us to detect a large infiltration zone that could be responsible for an important part of the annual water infiltration.

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Understanding leachate flow in municipal solid waste landfills by combining time-lapse ERT and subsurface flow modelling – Part I: Analysis of infiltration shape on two different waste deposit cells

Cited by 33 publications

References 38 publications

Three‐Dimensional Time‐Lapse Geoelectrical Monitoring of Water Infiltration in an Experimental Mine Waste Rock Pile

Three‐Dimensional Time‐Lapse Geoelectrical Monitoring of Water Infiltration in an Experimental Mine Waste Rock Pile

Six Years Temperature Monitoring Using Fibre-Optic Sensors in a Bioreactor Landfill

The effect of initial water distribution and spatial resolution on the interpretation of ERT monitoring of water infiltration in a landfill cover

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