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Lookup NU author(s): Professor Paul Younger
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Subsurface permeable reactive barriers (PRB) have been used to successfully treat acidic mine drainage in Canada and offer great potential for doing the same in the United Kingdom. A PRB for the treatment of colliery spoil leachate from a site near Newcastle upon Tyne, UK, has been designed. The selection of the reactive media to be used is of paramount importance, with particular reference to permeability and reactivity. A number of reactive media mixtures containing varying proportions of cattle slurry screenings, green waste compost, calcite limestone chips and pea gravel were prepared and their respective permeabilities and reactivities were investigated. Media mixtures containing 50% 10mm grade calcite limestone chips showed better alkalinity addition and metals removal than a blank containing 50% pea gravel. A media mixture containing 50% limestone chips and 50% green waste compost showed a 24h period to achieve maximum addition of alkalinity and maximum removal of acidity and metals. Mixtures containing 25% green waste compost and 25% slurry screenings achieved maximum addition/removal in 4h. The likely presence of iron sulphide in samples drawn from test vessels during both test runs indicates that bacterial sulphate reduction is occurring in this composite. © 2002 Elsevier Science Ltd. All rights reserved.
Author(s): Amos PW, Younger PL
Publication type: Article
Publication status: Published
Journal: Water Research
Year: 2003
Volume: 37
Issue: 1
Pages: 108-120
ISSN (print): 0043-1354
ISSN (electronic): 1879-2448
Publisher: Pergamon
URL: http://dx.doi.org/10.1016/S0043-1354(02)00159-8
DOI: 10.1016/S0043-1354(02)00159-8
PubMed id: 12465792
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