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Investigating clogging failure mechanisms of leachate extraction wells in landfills

Investigating clogging failure mechanisms of leachate extraction wells in landfills
Investigating clogging failure mechanisms of leachate extraction wells in landfills
To help reduce leachate heads in lined and unlined landfills, vertical leachate abstraction wells are commonly used. The effectiveness of vertical wells in landfills is, however, often perceived to be poor and to deteriorate over time. To investigate possible reasons for this, a downwell closed-circuit television (CCTV) survey of 25 leachate wells was carried out. Observations revealed significant corrosion of steel well screens, although only within the permanently unsaturated zone. Within the saturated parts of the well, corrosion of the screen and clogging did not occur. No biological fouling was observed in any of the wells examined. Exhumation and examination of three steel well screens from a landfill demonstrated significant screen corrosion in the unsaturated zone, with up to a 6 mm loss in section. Within the saturated zone, the gravel pack from each well showed no evidence of biological clogging, but there was some invasion of the gravel by intermediate cover material in two wells that had been developed.
0008-3674
1179-1187
Rees-White, T.
852278dd-f628-4d98-a03a-a34fea8c75d6
Beaven, R.P.
5893d749-f03c-4c55-b9c9-e90f00a32b57
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Cole, Darren
1717df4c-a19a-449d-97ba-6dec4b2c4c8d
Rees-White, T.
852278dd-f628-4d98-a03a-a34fea8c75d6
Beaven, R.P.
5893d749-f03c-4c55-b9c9-e90f00a32b57
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Cole, Darren
1717df4c-a19a-449d-97ba-6dec4b2c4c8d

Rees-White, T., Beaven, R.P., Powrie, W. and Cole, Darren (2013) Investigating clogging failure mechanisms of leachate extraction wells in landfills. Canadian Geotechnical Journal, 50 (11), 1179-1187. (doi:10.1139/cgj-2012-0478).

Record type: Article

Abstract

To help reduce leachate heads in lined and unlined landfills, vertical leachate abstraction wells are commonly used. The effectiveness of vertical wells in landfills is, however, often perceived to be poor and to deteriorate over time. To investigate possible reasons for this, a downwell closed-circuit television (CCTV) survey of 25 leachate wells was carried out. Observations revealed significant corrosion of steel well screens, although only within the permanently unsaturated zone. Within the saturated parts of the well, corrosion of the screen and clogging did not occur. No biological fouling was observed in any of the wells examined. Exhumation and examination of three steel well screens from a landfill demonstrated significant screen corrosion in the unsaturated zone, with up to a 6 mm loss in section. Within the saturated zone, the gravel pack from each well showed no evidence of biological clogging, but there was some invasion of the gravel by intermediate cover material in two wells that had been developed.

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Published date: 6 September 2013
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 359807
URI: https://eprints.soton.ac.uk/id/eprint/359807
ISSN: 0008-3674
PURE UUID: 2c5e9ffe-6b99-4be8-9a78-732b8ea7d3d2
ORCID for T. Rees-White: ORCID iD orcid.org/0000-0001-9009-8432
ORCID for R.P. Beaven: ORCID iD orcid.org/0000-0002-1387-8299
ORCID for W. Powrie: ORCID iD orcid.org/0000-0002-2271-0826

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Date deposited: 13 Nov 2013 13:50
Last modified: 20 Jul 2019 01:19

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Contributors

Author: T. Rees-White ORCID iD
Author: R.P. Beaven ORCID iD
Author: W. Powrie ORCID iD
Author: Darren Cole

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