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Single-well injection-withdrawal tests as a contaminant transport characterisation tool for landfilled waste

Single-well injection-withdrawal tests as a contaminant transport characterisation tool for landfilled waste
Single-well injection-withdrawal tests as a contaminant transport characterisation tool for landfilled waste
A new single well injection withdrawal (SWIW) test was trialled at four landfills using the tracers lithium and deuterium, and by injecting clean water and measuring electrical conductivity. The aim of the research was to develop a practical test for measuring lateral contaminant transport to aid in the design of landfill flushing.

Borehole dilution tests using dyes were undertaken prior to each SWIW test to determine background flow velocities. SWIW tests were performed at different scales by varying the volume of tracer injected (1 to 5,800 m3) and the test duration (2 to 266 days). Tracers were used individually, simultaneously or sequentially to examine repeatability and scaling.

Mobile porosities, estimated from first arrival times in observation wells and from model fitting ranged from 0.02 to 0.14. The low mobile porosities measured rule out a purely advective-dispersive system and support a conceptual model of a highly preferential dual-porosity flow system with localised heterogeneity. A dual-porosity model was used to interpret the results. The model gave a good fit to the test data in 7 out of 11 tests (where R20.98), and the parameters derived are compatible with previous experiments in MSW.

Block diffusion times were estimated to range from 12 to 6,630 hours, with a scaling relationship apparent between the size of the test (volume of tracer used and/or the duration) and the observed block diffusion time. This scaling relationship means affordable small-scale tests can inform larger-scale flushing operations.
Dual-porosity, Flushing, SWIW tests, Tracer Tests, municipal solid waste
0956-053X
142-153
Rees-White, Tristan
852278dd-f628-4d98-a03a-a34fea8c75d6
Woodman, Nicholas
9870f75a-6d12-4815-84b8-6610e657a6ad
Beaven, R.P.
5893d749-f03c-4c55-b9c9-e90f00a32b57
Barker, John
33bf9dec-cc9b-451c-8192-46099e316b6d
Rollinson, James
30e15bb3-3633-45d9-8097-342df979bf0d
Rees-White, Tristan
852278dd-f628-4d98-a03a-a34fea8c75d6
Woodman, Nicholas
9870f75a-6d12-4815-84b8-6610e657a6ad
Beaven, R.P.
5893d749-f03c-4c55-b9c9-e90f00a32b57
Barker, John
33bf9dec-cc9b-451c-8192-46099e316b6d
Rollinson, James
30e15bb3-3633-45d9-8097-342df979bf0d

Rees-White, Tristan, Woodman, Nicholas, Beaven, R.P., Barker, John and Rollinson, James (2021) Single-well injection-withdrawal tests as a contaminant transport characterisation tool for landfilled waste. Waste Management, 128, 142-153. (doi:10.1016/j.wasman.2021.04.047).

Record type: Article

Abstract

A new single well injection withdrawal (SWIW) test was trialled at four landfills using the tracers lithium and deuterium, and by injecting clean water and measuring electrical conductivity. The aim of the research was to develop a practical test for measuring lateral contaminant transport to aid in the design of landfill flushing.

Borehole dilution tests using dyes were undertaken prior to each SWIW test to determine background flow velocities. SWIW tests were performed at different scales by varying the volume of tracer injected (1 to 5,800 m3) and the test duration (2 to 266 days). Tracers were used individually, simultaneously or sequentially to examine repeatability and scaling.

Mobile porosities, estimated from first arrival times in observation wells and from model fitting ranged from 0.02 to 0.14. The low mobile porosities measured rule out a purely advective-dispersive system and support a conceptual model of a highly preferential dual-porosity flow system with localised heterogeneity. A dual-porosity model was used to interpret the results. The model gave a good fit to the test data in 7 out of 11 tests (where R20.98), and the parameters derived are compatible with previous experiments in MSW.

Block diffusion times were estimated to range from 12 to 6,630 hours, with a scaling relationship apparent between the size of the test (volume of tracer used and/or the duration) and the observed block diffusion time. This scaling relationship means affordable small-scale tests can inform larger-scale flushing operations.

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Rees-White SWIW Paper - Author's Original
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More information

In preparation date: 16 March 2021
e-pub ahead of print date: 11 May 2021
Published date: 1 June 2021
Keywords: Dual-porosity, Flushing, SWIW tests, Tracer Tests, municipal solid waste

Identifiers

Local EPrints ID: 447913
URI: http://eprints.soton.ac.uk/id/eprint/447913
ISSN: 0956-053X
PURE UUID: 4aee3ed1-7332-49c2-ace5-43b31b65b1bd
ORCID for Tristan Rees-White: ORCID iD orcid.org/0000-0001-9009-8432
ORCID for Nicholas Woodman: ORCID iD orcid.org/0000-0002-5571-0451
ORCID for R.P. Beaven: ORCID iD orcid.org/0000-0002-1387-8299

Catalogue record

Date deposited: 26 Mar 2021 17:30
Last modified: 26 Nov 2021 02:52

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Contributors

Author: R.P. Beaven ORCID iD
Author: John Barker
Author: James Rollinson

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