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Alternative Waste Residue Materials for passive in-situ prevention of sulfide-mine tailings oxidation: A Field Evaluation
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Crustal Geophysics and Geochemistry Science Center, U.S. Geological Survey, Denver Federal Center.
Niras, Box 70375, SE-107 24, Stockholm.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0001-7291-8505
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2014 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 267, p. 245-254Article in journal (Refereed) Published
Abstract [en]

Novel solutions for sulfide-mine tailings remediation were evaluated in field-scale experiments on a former tailings repository in northern Sweden. Uncovered sulfide-tailings were compared to sewage-sludge biosolid amended tailings over 2 years. An application of a 0.2 m single-layer sewage-sludge amendment was unsuccessful at preventing oxygen ingress to underlying tailings. It merely slowed the sulfide-oxidation rate by 20%. In addition, sludge-derived metals (Cu, Ni, Fe, and Zn) migrated and precipitated at the tailings-to-sludge interface. By using an additional 0.6 m thick fly-ash sealing layer underlying the sewage sludge layer, a solution to mitigate oxygen transport to the underlying tailings and minimize sulfide-oxidation was found. The fly-ash acted as a hardened physical barrier that prevented oxygen diffusion and provided a trap for sludge-borne metals. Nevertheless, the biosolid application hampered the application, despite the advances in the effectiveness of the fly-ash layer, as sludge-borne nitrate leached through the cover system into the underlying tailings, oxidizing pyrite. This created a 0.3 m deep oxidized zone in 6-years. This study highlights that using sewage sludge in unconventional cover systems is not always a practical solution for the remediation of sulfide-bearing mine tailings to mitigate against sulfide weathering and acid rock drainage formation

Place, publisher, year, edition, pages
2014. Vol. 267, p. 245-254
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-11403DOI: 10.1016/j.jhazmat.2013.12.066ISI: 000332812500030PubMedID: 24462894Scopus ID: 2-s2.0-84892850378Local ID: a5d04ca9-5362-4af7-a86d-59cb772ded42OAI: oai:DiVA.org:ltu-11403DiVA, id: diva2:984353
Note
Validerad; 2014; 20140107 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-11-22Bibliographically approved

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Nason, PeterAlakangas, LenaÖhlander, Björn

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