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Electrokinetic generation of reactive iron-rich barriers in wet sediments: implications for contaminated land management

Electrokinetic generation of reactive iron-rich barriers in wet sediments: implications for contaminated land management
Electrokinetic generation of reactive iron-rich barriers in wet sediments: implications for contaminated land management
Here we describe preliminary research into the in situ electrokinetic generation of continuous iron-rich precipitates to act as sub-surface barriers for the containment of contaminated sites. This is achieved using sacrificial iron electrodes emplaced either side of a soil/sediment mass to introduce iron into the system, and their dissolution and re-precipitation under the influence of an applied (DC) electric field. Continuous vertical and horizontal iron-rich bands (up to 2 cm thick) have been generated over a timescale of 300–500 h, at voltages of <5 V with an electrode separation of between 15 and 30 cm. The thickness of the iron-rich band increases as the applied voltage is increased. Geotechnical tests in sand indicate that the iron-rich band produced is practically impervious (coefficient of permeability of 10?9 ms?1 or less), and has significant mechanical strength (unconfined compressive strength of 10.8 N mm?2). By monitoring the current, the integrity of the iron-rich band may be assessed, and by continued application of current, the barrier may ‘self heal’. The iron-rich barrier is composed of amorphous iron, goethite, lepidocrocite, maghemite and native iron.
electrokinetics, horizontal barriers, iron, contaminated land
0026-461X
749-757
Faulkner, D.W.S.
1800bb51-9136-43d5-a5dd-9eb782a1d04d
Hopkinson, L.
bd4c65de-14e5-4e90-8ca5-4c6986dc87f3
Cundy, A.B.
994fdc96-2dce-40f4-b74b-dc638286eb08
Faulkner, D.W.S.
1800bb51-9136-43d5-a5dd-9eb782a1d04d
Hopkinson, L.
bd4c65de-14e5-4e90-8ca5-4c6986dc87f3
Cundy, A.B.
994fdc96-2dce-40f4-b74b-dc638286eb08

Faulkner, D.W.S., Hopkinson, L. and Cundy, A.B. (2005) Electrokinetic generation of reactive iron-rich barriers in wet sediments: implications for contaminated land management. Mineralogical Magazine, 69 (5), 749-757. (doi:10.1180/0026461056950285).

Record type: Article

Abstract

Here we describe preliminary research into the in situ electrokinetic generation of continuous iron-rich precipitates to act as sub-surface barriers for the containment of contaminated sites. This is achieved using sacrificial iron electrodes emplaced either side of a soil/sediment mass to introduce iron into the system, and their dissolution and re-precipitation under the influence of an applied (DC) electric field. Continuous vertical and horizontal iron-rich bands (up to 2 cm thick) have been generated over a timescale of 300–500 h, at voltages of <5 V with an electrode separation of between 15 and 30 cm. The thickness of the iron-rich band increases as the applied voltage is increased. Geotechnical tests in sand indicate that the iron-rich band produced is practically impervious (coefficient of permeability of 10?9 ms?1 or less), and has significant mechanical strength (unconfined compressive strength of 10.8 N mm?2). By monitoring the current, the integrity of the iron-rich band may be assessed, and by continued application of current, the barrier may ‘self heal’. The iron-rich barrier is composed of amorphous iron, goethite, lepidocrocite, maghemite and native iron.

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More information

Published date: 7 December 2005
Keywords: electrokinetics, horizontal barriers, iron, contaminated land
Organisations: Geochemistry

Identifiers

Local EPrints ID: 399494
URI: https://eprints.soton.ac.uk/id/eprint/399494
ISSN: 0026-461X
PURE UUID: 4d8e18f8-d74d-44c9-861d-b5a53a809863
ORCID for A.B. Cundy: ORCID iD orcid.org/0000-0003-4368-2569

Catalogue record

Date deposited: 17 Aug 2016 13:27
Last modified: 07 Aug 2019 00:31

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Contributors

Author: D.W.S. Faulkner
Author: L. Hopkinson
Author: A.B. Cundy ORCID iD

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