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.
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
6 September 2013
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), .
(doi:10.1139/cgj-2012-0478).
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
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Local EPrints ID: 359807
URI: http://eprints.soton.ac.uk/id/eprint/359807
ISSN: 0008-3674
PURE UUID: 2c5e9ffe-6b99-4be8-9a78-732b8ea7d3d2
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Date deposited: 13 Nov 2013 13:50
Last modified: 15 Mar 2024 03:27
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Darren Cole
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