Hydro-mechanical behavior of Municipal Solid Waste subject to leachate recirculation in a large-scale compression reactor cell

Olivier, F.; Gourc, Jean-Pierre

doi:10.1016/j.wasman.2006.01.025

Cited by 96 publications

(51 citation statements)

References 7 publications

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“…Powrie and Beaven, 1999;Hudson et al, 1999Hudson et al, , 2001Hudson et al, , 2004Stoltz et al, 2010;Olivier & Gourc, 2007). As well as variation due to different methods of compaction, waste in a landfill can be substantially compressed by the weight of overlying layers, which may reach several tens of metres deep.…”

Section: Introductionmentioning

confidence: 99%

Investigating the effect of compression on solute transport through degrading municipal solid waste

et al. 2014

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The effect of applied compression on the nature of liquid flow and hence the movement of contaminants within Municipal Solid Waste was examined by means of thirteen tracer tests conducted on five separate waste samples. The conservative nature of bromide, lithium and deuterium tracers was evaluated and linked to the presence of degradation in the sample. Lithium and deuterium tracers were non-conservative in the presence of degradation, whereas the bromide remained effectively conservative under all conditions. Solute diffusion times into and out of less mobile blocks of waste were compared for each test under the assumption of dominantly dual-porosity flow. Despite the fact that hydraulic conductivity changed strongly with applied stress, the block diffusion times were found to be much less sensitive to compression. A simple conceptual model, whereby flow is dominated by sub-parallel low permeability obstructions which define predominantly horizontally aligned less mobile zones, is able to explain this result. Compression tends to narrow the gap between the obstructions, but not significantly alter the horizontal length scale. Irrespective of knowledge of the true flow pattern, these results show that simple models of solute flushing from landfill which do not include depth dependent changes in solute transport parameters are justified.

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Section: Introductionmentioning

confidence: 99%

Investigating the effect of compression on solute transport through degrading municipal solid waste

et al. 2014

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“…The horizontal deposition and compaction processes used in landfills structures the waste in a way that tends to orient materials horizontally, creating a discontinuous, impermeable boundary to vertical water or leachate flow (Xie et al 2006, Olivier andGourc 2007). Flat, impermeable sheet-like components such as plastics may greatly alter the fabric of the material with respect to the predominant flow paths.…”

Section: Waste Hydraulic Conductivitymentioning

confidence: 99%

Investigation of the Geotechnical Properties of Municipal Solid Waste as a Function of Placement Conditions

Wong¹

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shear strength testing over moisture contents ranging from 11% to 110%. Baseline compaction curves were developed for different compactive efforts. Similar to soils, the MMSW had bell shaped compaction curves that peaked at a maximum dry unit weight and associated optimum moisture content. The compaction curve generated at modified compactive effort had a maximum dry unit weight of 5.1 kN/m 3 and optimum moisture content of 66%. Four times modified compactive effort testing resulted in a maximum

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“…The transition from mechanical creep to biocompression (t B ) has been linked to a break in slope of timedependent compression plotted on a semi-logarithmic plot (e.g., Fig. 1), the onset of methane generation (e.g., Bareither et al 2010a;Gourc et al 2010), and a decrease in leachate volatile fatty acid concentration or chemical oxygen demand and corresponding increase in pH (e.g., Olivier and Gourc 2007;Ivanova et al 2008;Bareither et al 2012a;Bareither et al 2013).…”

Section: Biocompressionmentioning

confidence: 99%

“…The additional waste layer included for the Control cell was due to a larger H 235 , which is consistent with a greater mass of waste in the Control cell ( Table 2). The number of waste layers selected for each cell was constrained to be a whole number, and the anticipated magnitude of immediate compression strain was assumed to be in the range of 0.10 to 0.30 based on previous studies (e.g., Kavazanjian et al 1999;Hossain et al 2003;Olivier and Gourc 2007;Bareither et al 2012c). A summary of three S I analyses and the corresponding compression parameters, S I , and waste thickness is in Table 5.…”

Section: Yolo Immediate Settlement Analysismentioning

confidence: 99%

Assessment of municipal solid waste settlement models based on field-scale data analysis

Bareither

Kwak²

2015

Waste Management

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ASSESSMENT OF MUNICIPAL SOLID WASTE SETTLEMENT MODELS BASED ON FIELD-SCALE DATA ANALYSISAn evaluation of municipal solid waste (MSW) settlement model performance and applicability was conducted based on analysis of two field-scale datasets: (1) Yolo and (2) Deer Track Bioreactor Experiment (DTBE). Yolo data were used to assess a multi-layer immediate settlement analysis and model applicability to represent compression behavior in conventional and bioreactor landfills. The DTBE included four waste layers constituting a composite waste thickness. Settlement data for each waste layer were simulated to assess variation in model parameters, and a composite waste settlement prediction was completed via applying average DTBE model parameters to each waste layer and summing settlement to represent measured settlement at the top of the waste column.The multi-layer immediate settlement analysis developed for Yolo provides a framework to estimate the initial waste thickness and waste thickness at end-of-immediate compression.An empirical estimate of the immediate compression ratio (C c ' = 0.23) combined with precompression stress (10 to 15 kPa) and recompression ratio = 1/10•C c ' yielded the target immediate settlement for the Yolo test cells. A precompression stress and recompression ratio may need to be included when using empirical estimates of C c ' to predict immediate settlement under small vertical stress (e.g., less than 15 kPa). shown to provide accurate simulations and predictions of field-scale datasets.The Gourc model included the lowest number of total and optimized model parameters and yielded high statistical performance for the DTBE prediction (R 2 = 0.99). The Gourc model was also found to be the most applicable and straightforward to implement and is recommended for use in practice. All other models that included unique functions for immediate compression, mechanical creep, and biocompression (Machado, Sowers, Marques, Babu, and Chen-2012) are capable of yielding satisfactory MSW simulations and predictions; however, additional model and/or model constraints are necessary for implementing these models.iv ACKNOWLEDGEMENTS

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Hydro-mechanical behavior of Municipal Solid Waste subject to leachate recirculation in a large-scale compression reactor cell

Cited by 96 publications

References 7 publications

Investigating the effect of compression on solute transport through degrading municipal solid waste

Investigating the effect of compression on solute transport through degrading municipal solid waste

Investigation of the Geotechnical Properties of Municipal Solid Waste as a Function of Placement Conditions

Assessment of municipal solid waste settlement models based on field-scale data analysis

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