Numerical modeling of the long term behavior of Municipal Solid Waste in a bioreactor landfill

Hubert, Julien; Liu, Xianfeng; Collin, Frèdèric

doi:10.1016/j.compgeo.2015.10.007

Cited by 44 publications

(19 citation statements)

References 47 publications

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“…To this point, the authors believe no data have been published that confirm or refute this, particularly where well constrained studies integrate reasonable estimates of post-directive BW that are compared to developing leachate chemistry. Recent leachate composition research continues to identify the complex but nonetheless established evolution arising during waste degradation and, for the most part, proposes innovations in leachate treatment (Adhikari et al, 2014;Hubert et al, 2016;Moody & Townsend, 2017;Naveen et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Altered chemical evolution in landfill leachate post implementation of biodegradable waste diversion

et al. 2018

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Abstract:Within the UK implementation of the EU Landfill Directive (1999) has led to the diversion of Biodegradable Waste (BW) from municipal solid wastes away from landfills. It has been widely anticipated, but thus far not verified, that the diversion of BW and consequent reduction in BW reaching landfill would lead to a change in the degradation processes occurring within landfills and that this would be reflected in an altered evolution in leachate chemistry compared to pre-Directive landfills. This paper provides evidence based on leachate chemistry from two operational landfills together with calculations of the reduced BW content, that demonstrate the acetogenic phase that characterised pre-directive landfill leachates is missing and is now more typical of methanogenic phase leachate. The paper demonstrates how data from national datasets and detailed landfill records can be used to constrain likely, and upper estimates of the amount of BW going into post-directive landfills and the observed change in the evolution of leachate chemistry which has resulted from a decrease in BW content from typical values of BW (pre-landfill directive) of 22% to an inferred 12% in the case-study landfills. Data provided here adds to the growing literature that estimates the amount of BW in recent post-directive landfills which importantly allow the quantitative linkage between a decrease in landfilled BW and observed changes in leachate chemistry to be established such that future landfill operators can increase confidence in the effect of Directive implementation on landfill operational parameters.

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Section: Introductionmentioning

confidence: 99%

Altered chemical evolution in landfill leachate post implementation of biodegradable waste diversion

et al. 2018

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“…However, natural sedimentary soils are usually gap-graded in terms of particle size distribution due to the presence of certain extents of coarse particles (Satyanaga et al 2013;Chang et al 2014;Zhou et al 2016;Ng et al 2016;Cui et al 2017). Human activities may also lead to gap-graded soils, for example, in hydraulic dredging engineering (Deng et al 2017), land reclamation projects (Yin 1999b;Silva 2016;Shi and Yin 2018c), debris flow-structure interaction mechanisms (Cui et al 2018), and municipal solid waste (MSW) disposal (Marques et al 2003;Feng et al 2014;Hubert et al 2016). Typically, the soils caused by these activities are a mixture of soft matrix with stiff inclusions (e.g., river sand distributed in clay slurry in hydraulic dredging activities; biodegradation-induced matrix mixed with solid materials in MSW).…”

Section: Introductionmentioning

confidence: 99%

Elastic Visco-Plastic Model for Binary Sand-Clay Mixtures with Applications to One-Dimensional Finite Strain Consolidation Analysis

2019

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The pore water dissipation of sand-clay mixtures is significantly affected by the sand fraction due to nonuniform stress distribution. On the basis of the elastic visco-plastic modeling concepts of Yin and Graham, a new elastic visco-plastic (EVP) model based on Lagrangian formulation was proposed to consider the effects of sand fraction in a sand-clay mixture on the time-dependent stress-strain behavior at finite strain. In hydraulic dredging and marine deposit improvement projects, the initial water content of mixtures is relatively high, leading to a high compressibility. Therefore, the soil skeleton of the mixtures was fixed to Lagrangian coordinates to facilitate the definition of soil boundary. The governing equation was formulated by combining an equivalent time concept with the mixture theory. A finite difference method was adopted for the benchmark analysis of boundary-initial value problems. The proposed model contained eight parameters. Seven of them pertained to the clay matrix that can be calibrated from the reference time line, instant time line, and consolidation curves of the pure clay in the mixture. The structure parameter represented the intergranular structure and can be calibrated based on the compressibility of a sand-clay mixture. Two multistage oedometer tests (including unloading stages) can be performed to calibrate the model parameters, one on the pure clay and the other on the sand-clay mixture with a predefined sand fraction. A benchmark analysis of the proposed model revealed a significant difference in excess pore pressure dissipation between Eulerian and Lagrangian coordinates. The calibrated model based on Lagrangian coordinates was found to reproduce the effect of sand fraction on the overall responses of sand-clay mixture well when compared with the experimental data of sand-bentonite mixtures and sand-marine clay mixtures from the literature.

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“…The model developed by Hubert et al (2016) This re-enforces the fact that while several coupled models exist in the literature, limited field data exist to validate these models. Table 1 provides a summary of the components included in the coupled models discussed in this literature.…”

Section: Coupled Modelsmentioning

confidence: 78%

“…The aerobic phase begins just after the waste is landfilled and lasts for a few weeks at the most as the deposition of subsequent layers of waste deprives the previous ones of any oxygen. During this phase, the organic content is degraded into macromolecules by bacteria (Hubert et al 2016). In a study to model aerobic landfills, Fytanidis et al (2014) reviewed the different modelling approaches that can be used to simulate aerobic biodegradation of MSW.…”

Section: Aerobic Biodegradationmentioning

confidence: 99%

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Development of a Coupled Thermal-Mechanical-Biological Model to Simulate Temperatures and Settlement at a Landfill in Ste Sophie, Quebec

Kaur¹

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Numerical modeling of the long term behavior of Municipal Solid Waste in a bioreactor landfill

Cited by 44 publications

References 47 publications

Altered chemical evolution in landfill leachate post implementation of biodegradable waste diversion

Altered chemical evolution in landfill leachate post implementation of biodegradable waste diversion

Elastic Visco-Plastic Model for Binary Sand-Clay Mixtures with Applications to One-Dimensional Finite Strain Consolidation Analysis

Development of a Coupled Thermal-Mechanical-Biological Model to Simulate Temperatures and Settlement at a Landfill in Ste Sophie, Quebec

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