Leakage through liners constructed with geomembranes—part I. Geomembrane liners

Giroud, J.P.; Bonaparte, Rudolph

doi:10.1016/0266-1144(89)90009-5

Cited by 150 publications

(52 citation statements)

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“…Giroud and Bonaparte (1989) recommend using a defect area of 1 cm 2 for conservative reasons and adopting a defect density of 3-5 defects per hectare, if an intensive quality control monitoring during liner construction has been done. A flaw density of 30 defects per hectare or more is recommended if quality assurance is limited to spot checks or when environmental difficulties have been encountered during installation.…”

Section: Aftercare Periodmentioning

confidence: 99%

A new screening model for leachate production assessment at landfill sites

Pantini

Verginelli

Lombardi

2013

Int. J. Environ. Sci. Technol.

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This paper presents an alternative water balance model for predicting leachate production in landfills, from the operative to the post-closure management. The developed model, based on analytical and empirical equations, provides a quantitative estimation of leachate volumes, using a water balance approach which accounts for the different rates of the incoming water, water losses and water consumption. Aging and compression are also included, allowing to assess the progressive variation of hydraulic and physical properties of deposited wastes. In this work, after a brief description of the model architecture, different applications to hypothetical scenarios and to a real landfill are presented. Namely, in order to highlight how aging and biodegradation can influence the expected leachate production, the results of the developed model are also compared with those provided by the Hydrologic Evaluation of Landfill Performance model which neglects both these processes. The obtained results showed that wastes compression may affect leachate prediction in a large extent during operative stage of a landfill, and neglecting these processes could lead to underestimation up to one order of magnitude. Also biodegradation of waste organic matter may result relevant for leachate volumes assessment, influencing water storage capacity of wastes and leading to a leachate production 2-3 times greater than those obtained neglecting these phenomena. Finally, the application of the developed model to the real landfill shows a quite good agreement with the field data, whereas the Hydrologic Evaluation of Landfill Performance model tends to underestimate the leachate volumes with errors up to 80 %.

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Section: Aftercare Periodmentioning

confidence: 99%

A new screening model for leachate production assessment at landfill sites

Pantini

Verginelli

Lombardi

2013

Int. J. Environ. Sci. Technol.

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“…Most geomembranes have a very low permeativity to water, with most moisture transfer through the membrane occurring by diffusion rather than by bulk flow (Artieres et al 1994;Fityus and Smith 1998). The effect of a carefully laid geomembrane is to reduce moisture flow through the soil beneath the landfill to very small values (Giroud and Bonaparte 1989). If the piezometric groundwater table is located at some distance below the geomembrane and the air-entry value of the soil is not too high, then conditions are created where some depth of soil beneath the landfill will be in a state of partial saturation.…”

Section: Moisture Conditions Beneath a Landfillmentioning

confidence: 99%

Contaminant transport through an unsaturated soil liner beneath a landfill

Fityus¹,

Smith²,

Booker³

1999

Can. Geotech. J.

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Contaminant transport through soil is often modelled mathematically by means of the dispersion-advection equation. When investigating contaminant migration beneath a landfill, a common assumption is that the soil is saturated; however, it is well known that the soil beneath many landfills is only partially saturated. In this paper, steady-state unsaturated moisture distributions are employed in the dispersion-advection equation to find transient contaminant distributions beneath a landfill. A finite layer formulation is used to simplify the contaminant mass transport equation and account for heterogeneous soil profiles. Various assumptions concerning the flow regime beneath the landfill and the functional relation between volumetric water content and the diffusion coefficient in the transport equation are made to highlight differences between contaminant transport through saturated and unsaturated soils. It is found that diffusive contaminant mass transfer through a partially saturated soil liner is comparatively insensitive to variation of the volumetric moisture content at the top of the soil liner alone. However, accounting for the dependence of the diffusion coefficient on the volumetric moisture content of the soil does have a significant effect on diffusive mass transfer through a partially saturated soil liner. Though it is difficult to measure the dependence of the diffusion coefficient on the volumetric moisture content of the soil experimentally, this information appears necessary for a rational analysis of contaminant transport through partially saturated soils.Résumé : Le transport de contaminants à travers le sol est souvent modélisé mathématiquement au moyen de l'équation de dispersion-advection. Au cours de l'étude de la migration de contaminants sous un enfouissement sanitaire, l'on pose habituellement l'hypothèse que le sol est saturé; cependant, il est bien connu que le sol sous plusieurs enfouissements sanitaires n'est que partiellement saturé. Dans cet article, des distributions non saturées de teneur en eau à l'état permanent sont utilisées dans l'équation de dispersion-advection pour déterminer les distributions transitoires de contaminants sous l'enfouissement sanitaire. Une formulation de couche finie est utilisée pour simplifier l'équation de transport de masse du contaminant et prendre en compte les profils de sol hétérogènes. L'on fait diverses hypothèses concernant le régime d'écoulement sous l'enfouissement et la relation fonctionnelle entre la teneur en eau volumétrique et le coefficient de diffusion dans l'équation de transport pour mettre en lumière les différences entre le transport de contaminant à travers les sols saturés et non saturés. L'on trouve que le transfert de masse des contaminants par diffusion à travers une membrane de sol partiellement saturé est comparativement insensible à la variation de la teneur en eau volumétrique au sommet de la membrane de sol seule. Cependant, le fait de prendre en compte la dépendance du coefficient de diffusion sur la teneur en eau volumé...

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“…In Run 1, the base case against which the results of other runs were compared, it was assumed that the geomembrane liners installed at the bottom of the landfill were of poor quality, having approximately 10 flaws or defects per acre. This number was chosen on the basis of recommendations from Giraud and Bonaparte (1989) to represent a landfill where quality assurance checks were limited during installation of the liners. This assumption gives a conservative estimate of the leachate leakage rate.…”

Section: A1 Help Modelmentioning

confidence: 99%

“…In Runs 2 and 3, the effect of geomembrane quality on leakage through the ,bottom of the landfill was evaluated. -According to recommendations of Giraud and Bonaparte (1989), in Run 2, a flaw density of 1 flaw/acre was evaluated to represent the geomembrane quality at an intensively monitored landfill. Decreasing the number of defects to 1 flaw/acre decreased the total leakage through the bottom of the landfill to 2.4 f?/yr/acre.…”

Section: A1 Help Modelmentioning

confidence: 99%