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Exploring the use of micro-focus computed tomography for a better conceptual understanding of structure in landfilled waste in the context of post-closure management for landfills

Exploring the use of micro-focus computed tomography for a better conceptual understanding of structure in landfilled waste in the context of post-closure management for landfills
Exploring the use of micro-focus computed tomography for a better conceptual understanding of structure in landfilled waste in the context of post-closure management for landfills
Alternative landfill operation strategies are required to reduce the time for which a landfill poses a pollution risk. The application of those alternative strategies, e.g., aeration and flushing, requires recirculation of fluids, consequently their implementation requires better understanding of fluid flow and transport processes in landfills. Research in porous media has revealed that flow and transport processes are strongly controlled by the physical structure, in particular the pore size, geometry and interconnectivity and particle size and shape. It is generally accepted that landfilled municipal solid waste (MSW) develops a heterogeneous and anisotropic structure during placement, degradation and settlement; however our detailed understanding of the structure that develops once MSW is placed into landfills, and how it influences fluid flow is very limited. This paper discusses the use of Micro-Computed Tomography ( CT) for the non invasive study of waste structure. Results are presented for waste analogues which were successfully analysed using threshold segmentation techniques to detect millimetre sized structural features and to quantify the volumetric content of high density materials. Improvements required (e.g., image quality, higher resolution, segmentation techniques) to extend CT to analyse the structure of landfilled waste samples and characterise pore architecture are also discussed.
0968-0802
259–268
Watson, Geoff
a7b86a0a-9a2c-44d2-99ed-a6c02b2a356d
Richards, David
a58ea81e-443d-4dab-8d97-55d76a43d57e
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Caicedo, Diana Milena
61c469e0-4f0b-4a05-ac73-ae3a57e64a92
Watson, Geoff
a7b86a0a-9a2c-44d2-99ed-a6c02b2a356d
Richards, David
a58ea81e-443d-4dab-8d97-55d76a43d57e
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Caicedo, Diana Milena
61c469e0-4f0b-4a05-ac73-ae3a57e64a92

Watson, Geoff, Richards, David, Powrie, William and Caicedo, Diana Milena (2011) Exploring the use of micro-focus computed tomography for a better conceptual understanding of structure in landfilled waste in the context of post-closure management for landfills. Sustainable Development, 21 (4), 259–268. (In Press)

Record type: Article

Abstract

Alternative landfill operation strategies are required to reduce the time for which a landfill poses a pollution risk. The application of those alternative strategies, e.g., aeration and flushing, requires recirculation of fluids, consequently their implementation requires better understanding of fluid flow and transport processes in landfills. Research in porous media has revealed that flow and transport processes are strongly controlled by the physical structure, in particular the pore size, geometry and interconnectivity and particle size and shape. It is generally accepted that landfilled municipal solid waste (MSW) develops a heterogeneous and anisotropic structure during placement, degradation and settlement; however our detailed understanding of the structure that develops once MSW is placed into landfills, and how it influences fluid flow is very limited. This paper discusses the use of Micro-Computed Tomography ( CT) for the non invasive study of waste structure. Results are presented for waste analogues which were successfully analysed using threshold segmentation techniques to detect millimetre sized structural features and to quantify the volumetric content of high density materials. Improvements required (e.g., image quality, higher resolution, segmentation techniques) to extend CT to analyse the structure of landfilled waste samples and characterise pore architecture are also discussed.

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More information

Accepted/In Press date: 1 October 2011

Identifiers

Local EPrints ID: 442431
URI: http://eprints.soton.ac.uk/id/eprint/442431
ISSN: 0968-0802
PURE UUID: 63eb7934-c8b6-4b21-a4fd-df82f2fc718b
ORCID for Geoff Watson: ORCID iD orcid.org/0000-0003-3074-5196
ORCID for William Powrie: ORCID iD orcid.org/0000-0002-2271-0826

Catalogue record

Date deposited: 15 Jul 2020 16:31
Last modified: 29 Jul 2020 01:35

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Contributors

Author: Geoff Watson ORCID iD
Author: David Richards
Author: William Powrie ORCID iD
Author: Diana Milena Caicedo

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