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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
Investigating the effect of compression on solute transport through degrading municipal solid waste
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.
MSW, MBT, tracer, breakthrough curve, compressive stress, conservative
0956-053X
2196-2208
Woodman, N.
9870f75a-6d12-4815-84b8-6610e657a6ad
Rees-White, T.
852278dd-f628-4d98-a03a-a34fea8c75d6
Stringfellow, A.
024efba8-7ffc-441e-a268-be43240990a9
Beaven, R.P.
5893d749-f03c-4c55-b9c9-e90f00a32b57
Hudson, A.P.
c834356f-d618-49d2-a8cc-cd338e1a87a4
Woodman, N.
9870f75a-6d12-4815-84b8-6610e657a6ad
Rees-White, T.
852278dd-f628-4d98-a03a-a34fea8c75d6
Stringfellow, A.
024efba8-7ffc-441e-a268-be43240990a9
Beaven, R.P.
5893d749-f03c-4c55-b9c9-e90f00a32b57
Hudson, A.P.
c834356f-d618-49d2-a8cc-cd338e1a87a4

Woodman, N., Rees-White, T., Stringfellow, A., Beaven, R.P. and Hudson, A.P. (2014) Investigating the effect of compression on solute transport through degrading municipal solid waste. Waste Management, 34 (11), 2196-2208. (doi:10.1016/j.wasman.2014.06.022).

Record type: Article

Abstract

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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Woodmanetal2014_EPRINTS.pdf - Accepted Manuscript
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Accepted/In Press date: 23 June 2014
e-pub ahead of print date: 22 July 2014
Published date: 1 November 2014
Keywords: MSW, MBT, tracer, breakthrough curve, compressive stress, conservative
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 372419
URI: http://eprints.soton.ac.uk/id/eprint/372419
ISSN: 0956-053X
PURE UUID: 5ef1cf06-3dba-4554-bde1-67b431de5b27
ORCID for N. Woodman: ORCID iD orcid.org/0000-0002-5571-0451
ORCID for T. Rees-White: ORCID iD orcid.org/0000-0001-9009-8432
ORCID for A. Stringfellow: ORCID iD orcid.org/0000-0002-8873-0010
ORCID for R.P. Beaven: ORCID iD orcid.org/0000-0002-1387-8299

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Date deposited: 10 Dec 2014 12:06
Last modified: 18 Feb 2021 17:09

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Contributors

Author: N. Woodman ORCID iD
Author: T. Rees-White ORCID iD
Author: A. Stringfellow ORCID iD
Author: R.P. Beaven ORCID iD
Author: A.P. Hudson

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