Modelling landfill leachate-induced clogging of field-scale test cells (mesocosms)

Cooke, Andrew; Rowe, R. Kerry

doi:10.1139/t08-076

Cited by 25 publications

(12 citation statements)

References 40 publications

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“…For the granular drainage layers, uniformly graded gravel with grain sizes d g ¼ 6 and 27 mm were modeled with the coarser (27 mm) gravel as the base. The initial porosity of the granular material with the grain size d g ¼ 27 mm was 0.41 and the initial hydraulic conductivity was 0.12 m=s (Cooke and Rowe 2008b). For the grain size d g ¼ 6 mm, the initial porosity and hydraulic conductivity were 0.39 and 0.05 m=s, respectively, as in the study by Cooke and Rowe (2008a).…”

Section: Model Summarymentioning

confidence: 53%

Modeling of Leachate Collection Systems with Filter Separators in Municipal Solid Waste Landfills

Rowe

2013

J. Environ. Eng.

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A numerical model is used to estimate the service life and clogging of gravel leachate drainage layers with a filter separator layer, such as those used in municipal solid waste landfills. A filter separator layer between the waste and the drainage layer is shown to reduce the leachate strength entering the gravel drainage layer and to extend the time that it takes to clog the drainage layer to the point when the leachate level exceeds the maximum design value (the service life). The filter layer is shown to have a far more significant effect in extending the service life when pea gravel (d g ¼ 6 mm) is used in the drainage layer, and less effect when coarse gravel (d g ¼ 27 mm) is used in the cases examined, although most of the benefit of a filter separator layer was achieved by using a 3-mm-thick needle-punched nonwoven geotextile. This geotextile may be sufficient for many practical purposes that are similar to those examined. The results from modeling leachate collection systems with filter separator layers subjected to both constant and variable leachate strength show that the characteristics of the leachate entering the drainage layer can substantially affect the service life of the drainage layer, and that high-strength leachate entering the systems for a limited time early in the life (acid phase) of a landfill can greatly reduce the service life of the leachate drainage layer.

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Section: Model Summarymentioning

confidence: 53%

Modeling of Leachate Collection Systems with Filter Separators in Municipal Solid Waste Landfills

Rowe

2013

J. Environ. Eng.

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“…For modelling the leachate transport and clog mass accumulation within the porous, a numerical model 'BioClog' was first developed by Cooke et al [4] and subsequently updated after five years by Cooke and Rowe [3]. BioClog first was created 1D model and used by Cooke et al [4].…”

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confidence: 99%

“…The calculated amount of clog mass within the columns coincided well with the measured laboratory results. Cooke and Rowe [3] employed BioClog-2D to model mesocosms and found that te model estimated the clog mass well in the upper regions of the saturated drainage layer but underestimated the clogging in the lower regions of saturated drainage layer [6].…”

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confidence: 99%

“…However, the BioClog model is sophisticated that it is not likely to be used in regular design. A new practical technique is developed and calibrated against the sophisticated numerical model to estimate the life of landfills lechate collection systems [3,10].…”

mentioning

confidence: 99%

“…Several equations based on the simplified assumptions are used to predict the leachate head acting on the landfill bottom liner for a given infiltration rate, pipe spacing, base slope, and initial. Over the past decade, a numerical model (BioClog) for estimating the clogging of porous media permeated by leachate has been developed [3,4,7,10]. BioClog simulates the growth and loss of five films on the surface of porous media (biofilm arising from acetate, butyrate and propionate degraders, inert biofilm, and inorganic solids film).…”

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confidence: 99%

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Research of landfill drainage layer clogging

Bazienė

Vasarevičius

2014

The 9th International Conference "Environmental Engineering 2014"

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Landfills are the primary endpoints for the municipal solid waste materials after reduction, reuse, and recycling. The leachate drainage filling conductivity decrease in municipal waste landfills is researched and various solutions are offered. The leachate drainage filling conductivity decrease in municipal waste landfills is researched and various solutions are offered, but the problem remains. For modelling the leachate transport and clog mass accumulation within the porous was used a numerical model BioClog. The objective of all study is to establish the filling porosity change over a certain period of time by filtering the leachate from municipal waste landfills through experimental test columns, filled with various fillings and to compare with results, which are calculated with sophisticated mathematic model BioClog. All results are counted of tree different times (after 1 year, 15 and 30 years). These different times helps to compare the laboratory results. Also it is helps to be assumed clogging processes. Experiments and computer modelling results confirms the conclusion that tyre shreds are a material recommendable for the formation of leachate drainage layer in municipal waste landfills.

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Modeling of leachate recirculation using vertical wells in bioreactor landfills

Feng

Cao

Zhang

et al. 2015

Environ Sci Pollut Res

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Leachate recirculation (LR) in municipal solid waste (MSW) landfills operated as bioreactors offers significant economic and environmental benefits. The subsurface application method of vertical wells is one of the most common LR techniques. The objective of this study was to develop a novel two-dimensional model of leachate recirculation using vertical wells. This novel method can describe leachate flow considering the effects of MSW settlement while also accounting separately for leachate flow in saturated and unsaturated zones. In this paper, a settlement model for MSW when considering the effects of compression and biodegradation on the MSW porosity was adopted. A numerical model was proposed using new governing equations for the saturated and unsaturated zones of a landfill. The following design parameters were evaluated by simulating the recirculated leachate volume and the influence zones of waste under steady-state flow conditions: (1) the effect of MSW settlement, (2) the effect of the initial void ratio, (3) the effect of the injected head, (4) the effect of the unit weight, (5) the effect of the biodegradation rate, and (6) the effect of the compression coefficient. The influence zones of LR when considering the effect of MSW settlement are smaller than those when neglecting the effect. The influence zones and LR volume increased with an increase in the injection pressure head and initial void ratio of MSW. The proposed method and the calculation results can provide important insight into the hydrological behavior of bioreactor landfills.

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Modelling landfill leachate-induced clogging of field-scale test cells (mesocosms)

Cited by 25 publications

References 40 publications

Modeling of Leachate Collection Systems with Filter Separators in Municipal Solid Waste Landfills

Modeling of Leachate Collection Systems with Filter Separators in Municipal Solid Waste Landfills

Research of landfill drainage layer clogging

Modeling of leachate recirculation using vertical wells in bioreactor landfills

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