Quantifying the effect of settlement and gas on solute flow and transport through treated municipal solid waste

Woodman, N.; Siddiqui, A. Qayyum; Powrie, W.; Stringfellow, Anne; Beaven, R.P.; Richards, D. J.

doi:10.1016/j.jconhyd.2013.04.007

Cited by 15 publications

(23 citation statements)

References 36 publications

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“…In Test 0 and Tests 8-13 the simulated results have been reported separately (Woodman et al 2013a(Woodman et al , 2013b and are combined with new simulations for Tests 1-7 to provide a more comprehensive analysis of the effect of compression than would be achieved for a single sample. The effect of compression of each sample is examined and compared to the other samples (thus scoping for whether waste type and sample size are important compared to the primary compression variable) The experiments shared a basic configuration.…”

Section: Methodsmentioning

confidence: 99%

“…The solute transport model used to simulate these data, is described in detail in Woodman et al (2013b), and is summarised here. The major hydraulic units (the reservoir, top and bottom gravel layers and the waste itself) are modelled using transfer functions (Jury & Roth, 1990).…”

Section: Simulationmentioning

confidence: 99%

“…Tracer transport through the waste is simulated using a closed-loop dual porosity model, with the assumption of slab-shaped immobile blocks (Barker, 1985). This form of lumped model has been previously demonstrated to be appropriate for simulating aged and degrading waste (Woodman et al, 2005;Woodman et al, 2013b), despite expectation that the real geometry is complex. Conceivably, sub-parallel alignment of compressed plastic layers provides an approximately average block-like structure to the waste in the test-cells.…”

Section: Simulationmentioning

confidence: 99%

“…A mass-adjustment factor was implemented by Woodman et al (2013b;2013c) for analysing the non-conservative tracer BTCs. This assumed that any mass loss or gain could be simulated by an instantaneous change in the input concentration, such that the concentration at the input to the waste C i can be described by .…”

Section: Tracer Mass Balancementioning

confidence: 99%

“…Understanding waste flushing requires knowledge of the nature of the key transport processes through wastes and how these change under different conditions. The effect on flow and solute movement due to the generation of gas and settlement in degrading organic waste over time has been examined by Woodman et al (2013b). Aside this relatively uncontrolled natural process, certain site conditions can be controlled by engineers.…”

Section: Introductionmentioning

confidence: 99%

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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: Methodsmentioning

confidence: 99%

Section: Simulationmentioning

confidence: 99%

Section: Simulationmentioning

confidence: 99%

Section: Tracer Mass Balancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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Evaluation of dual permeability of gas flow in municipal solid waste: Experiment and modeling

Liu

Xue

Wan

et al. 2015

Env Prog and Sustain Energy

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Non‐homogeneity of permeability largely depends on heterogeneity of the pore structure of waste in a landfill, which contributes to variation in gas flow state. Gas pressure dropping test (GPDT) was one of the most effective methods to describe the gas preferential flow, was used to investigate the gas breakthrough curves in initial pressures, moisture contents and degradation phases in lab test. Dual‐permeability model was developed to quantify the gas preferential flow in waste column. The reliability of the model was verified by a good agreement from the gas flow rate between the simulation results and experimental results. The simulation results show the biodegradation of the waste produced an obviously decrease in the permeability in fracture system due to the variation of the particle distribution. The porosity and mass transfer in fracture system has largely decreased with the continued biodegradation and moisture content increasing. It will be provided useful evidence for assessing the gas preferential flow during the well operation in landfill. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 41–47, 2016

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Modeling the oxygen transport process under preferential flow effect in landfill

Liu

Xue

et al. 2018

Environ Sci Pollut Res

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Evaluation of oxygen distribution during aeration in landfill is significantly important to determine the design parameters of an injection well. A coupling model describing gas preferential transport in a landfill was developed, which linked the effect of advection-diffusion and oxidation reaction and mass exchange between the fracture and the matrix system. The quantitative simulation of the variation in gas distribution during vertical well aeration in short term was presented, combined with the typical cases in field site. The parameter sensitivity in the coupling model to gas transport was addressed. Simulation result of the oxygen and methane concentrations by using the dual advective-diffusive (DAD) model, which considered the immobile zone effect, was closer to the monitoring data than that by using single advective-diffusive model. The variation of the AR under aeration was presented with the key parameters to provide the theory evidence for gas well design in landfill. This study provided reference for the design of the gas injection well distribution in aerobic landfill.

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Quantifying the effect of settlement and gas on solute flow and transport through treated municipal solid waste

Cited by 15 publications

References 36 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

Evaluation of dual permeability of gas flow in municipal solid waste: Experiment and modeling

Modeling the oxygen transport process under preferential flow effect in landfill

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