Multiple-tracer tests for contaminant transport process identification in saturated municipal solid waste

Woodman, N.; Rees-White, T.; Stringfellow, Anne; Beaven, R.P.; Hudson, A.P.

doi:10.1016/j.wasman.2014.12.012

Cited by 18 publications

(18 citation statements)

References 43 publications

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“…In this test, the estimated lithium mass loss for the whole tracer BTC was 50 % (Woodman et al, 2013a). Some of this was due to the test stopping before full equilibration.…”

Section: Tracer Mass Balancementioning

confidence: 90%

“…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%

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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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“…In this test, the estimated lithium mass loss for the whole tracer BTC was 50 % (Woodman et al, 2013a). Some of this was due to the test stopping before full equilibration.…”

Section: Tracer Mass Balancementioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

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

et al. 2014

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“…Heterogeneity of the waste mass (Fellner et al, 2009;Rosqvist et al, 2005, Woodman et al, 2014) is likely to be an important factor in determining the rate that contaminant can be removed. The model is essentially empirical with an absence of a firm physical or chemical basis.…”

Section: Solute-transport Behaviourmentioning

confidence: 99%

Evaluating landfill aftercare strategies: A life cycle assessment approach

2017

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Abstract. This study investigates the potential impacts caused by the loss of active environmental control measures during the aftercare period of landfill management. A combined mechanistic solute flow model and life cycle assessment (LCA) approach was used to evaluate the potential impacts of leachate emissions over a 10,000 year time horizon. A continuum of control loss possibilities occurring at different times and for different durations were investigated for four different basic aftercare scenarios, including a typical aftercare scenario involving a low permeability cap and three accelerated aftercare scenarios involving higher initial infiltration rates. Assuming a 'best case' where control is never lost, the largest potential impacts resulted from the typical aftercare scenario. The maximum difference between potential impacts from the 'best case' and the 'worst case', where control fails at the earliest possible point and is never reinstated, was only a fourfold increase. This highlights potential deficiencies in standard life cycle impact assessment practice, which are discussed. Nevertheless, the results show how the influence of active control loss on the potential impacts of landfilling varies considerably depending on the aftercare strategy used and highlight the importance that leachate treatment efficiencies have upon impacts.

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“…On the one hand, the result of the gas flux prediction in the study was influenced by the simplified conditions in the simulation region, such as the permeability anisotropy of the landfill, gas production rate, and permeability of surface cover. On the other hand, preferential flow was apparent because of the obvious heterogeneities of the pore structure in the landfill body [14][15][16][17][18]. However, the simplified SPM could not describe the process of gas preferential flow [15,19].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of dual permeability of gas flow in municipal solid waste: Extraction well operation

Liu

Xue

et al. 2016

Env Prog and Sustain Energy

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The dual permeability model (DPM) is used to describe the gas flow in landfills under the preferential flow effect. A steady‐state radial DPM was developed in this study to predict gas distribution at extraction well operations. Two typical cases of a short‐term pumping field test from a single extraction well were also studied. The sensitivity of kf/km and mass transfer coefficient in the DPM was simulated. The mechanism of higher deviation between the simulation result and the test could be explained by the gas flux and influence radius, as determined by the single permeability model based on gas pressure distribution in the radial direction. The reliability of the DPM in the prediction of gas flux and influence radius in extraction wells was initially verified. The study provides evidence of the improvement of the design and operation parameters of extraction wells in landfills using the proposed method. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 1381–1386, 2016

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Multiple-tracer tests for contaminant transport process identification in saturated municipal solid waste

Cited by 18 publications

References 43 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

Evaluating landfill aftercare strategies: A life cycle assessment approach

Evaluation of dual permeability of gas flow in municipal solid waste: Extraction well operation

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