Modeling Leachate Production from Municipal Landfills

Demetracopoulos, Alexander C.; Sehayek, Lilly; Erdogan, Haydar

doi:10.1061/(asce)0733-9372(1986)112:5(849)

Cited by 45 publications

(20 citation statements)

References 10 publications

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“…The mass balance equation for the contaminant is (13) S(0C) 5(qC) 5t 5z (4) in which C = contaminant concentration, mg L" 1 ; E(0) = longitudinal dispersion coefficient, cm 2 * day" 1 ; and R = contaminant generation rate, mg L" 1 day" 1 The dispersion coefficient for flow through an unsaturated porous medium is assumed to be proportional to the first power of the average flow velocity (8 , 13 , 14), (5) in which V = average flow velocity (=q/0), cm day *; and X. = dispersivity, depending on the characteristics of the porous medium, cm.…”

Section: Moisture Transportmentioning

confidence: 99%

“…Wigh (11) developed a semi-empirical equation to describe the concentration histories of different contaminants in leachate generated from the experimental landfills. Braester (7) and other researchers (12,13,14) formulated solute transport models by using a one-dimensional convective-dispersive solute transport equation to predict the contaminant concentration under a transient saturated-unsaturated flow condition. The numerical results and analytical solutions of these models were compared with experimental data.…”

Section: Introductionmentioning

confidence: 99%

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Leaching from solid waste landfills part I: Modelling

Bai

1991

Environmental Technology

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A mathematical model haa been developed as a generalized computer program to simulate leaching from solid waste landfills. This model was based on the unsaturated flow equation, the solute transport equation, the water balance equation and incorporating the equations of chemical and microbial processes. Good agreement is obtained with the experimental data reported by Wigh and Brunner (1). This model can be applied to evaluate leachate quantity, predict the strength of various contaminants in leachate, and design and avoid failure of the leachate collection system.

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Section: Moisture Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Leaching from solid waste landfills part I: Modelling

Bai

1991

Environmental Technology

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“…In this zone it is normally assumed that due to capillarity the liquid pressure will be below that of the gas phase, although localised perching is possible. Several authors (Straub and Lynch, 1982;Demetracopoulos et al, 1986;McDougall & Silver, 2005;Kazimoglu et al, 2006) have attempted to address this regime. McCreanor and Reinhart (2000) modelled this zone using the Richards equation and White et al (2004) modelled both liquid and gaseous phases.…”

Section: Introductionmentioning

confidence: 99%

Multiple-tracer tests for contaminant transport process identification in saturated municipal solid waste

et al. 2015

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Two column tests were performed in conditions emulating vertical flow beneath the leachate table in a biologically active landfill to determine dominant transport mechanisms occurring in landfills. An improved understanding of contaminant transport process in wastes is required for developing better predictions about potential length of the long term aftercare of landfills, currently measured in timescales of centuries. Three tracers (lithium, bromide and deuterium) were used. Lithium did not behave conservatively. Given that lithium has been used extensively for tracing in landfill wastes, the tracer itself and the findings of previous tests which assume that it has behaved conservatively may need revisiting.The smaller column test could not be fitted with continuum models, probably because the volume of waste was below a representative elemental volume. Modelling compared advection-dispersion (AD), dual porosity (DP) and hybrid AD-DP models. Of these models, the DP model was found to be the most suitable. Although there is good evidence to suggest that diffusion is an important transport mechanism, the breakthrough curves of the different tracers did not differ from each other as would be predicted based

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“…However, despite this concern, under certain conditions real landfill flushing processes can produce monotonically decaying concentrations, and even approximately exponential behaviour (Woodman et al, 2007). The exponential approach has been widely used in the literature (Straub and Lynch, 1982;Demetracopoulos et al, 1986;Reitzel et al, 1992), and for risk assessment purposes (Drury et al, 2003). The model has the advantage of considering how a variety of physical, chemical, and microbial processes affect each different species based on a single species-specific decay constant κ i (US EPA, 1999).…”

Section: Solute-transport Behaviourmentioning

confidence: 99%

Evaluating landfill aftercare strategies: A life cycle assessment approach

2017

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Abstract. This study investigates the potential impacts caused by the loss of active environmental control measures during the aftercare period of landfill management. A combined mechanistic solute flow model and life cycle assessment (LCA) approach was used to evaluate the potential impacts of leachate emissions over a 10,000 year time horizon. A continuum of control loss possibilities occurring at different times and for different durations were investigated for four different basic aftercare scenarios, including a typical aftercare scenario involving a low permeability cap and three accelerated aftercare scenarios involving higher initial infiltration rates. Assuming a 'best case' where control is never lost, the largest potential impacts resulted from the typical aftercare scenario. The maximum difference between potential impacts from the 'best case' and the 'worst case', where control fails at the earliest possible point and is never reinstated, was only a fourfold increase. This highlights potential deficiencies in standard life cycle impact assessment practice, which are discussed. Nevertheless, the results show how the influence of active control loss on the potential impacts of landfilling varies considerably depending on the aftercare strategy used and highlight the importance that leachate treatment efficiencies have upon impacts.

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Modeling Leachate Production from Municipal Landfills

Cited by 45 publications

References 10 publications

Leaching from solid waste landfills part I: Modelling

Leaching from solid waste landfills part I: Modelling

Multiple-tracer tests for contaminant transport process identification in saturated municipal solid waste

Evaluating landfill aftercare strategies: A life cycle assessment approach

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