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Alternative Waste Residue Materials for passive in-situ prevention of sulfide-mine tailings oxidation: A Field Evaluation
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.
Crustal Geophysics and Geochemistry Science Center, U.S. Geological Survey, Denver Federal Center.
Niras, Box 70375, SE-107 24, Stockholm.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0001-7291-8505
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2014 (engelsk)Inngår i: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 267, s. 245-254Artikkel i tidsskrift (Fagfellevurdert) 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

sted, utgiver, år, opplag, sider
2014. Vol. 267, s. 245-254
HSV kategori
Forskningsprogram
Tillämpad geologi
Identifikatorer
URN: urn:nbn:se:ltu:diva-11403DOI: 10.1016/j.jhazmat.2013.12.066ISI: 000332812500030PubMedID: 24462894Scopus ID: 2-s2.0-84892850378Lokal ID: a5d04ca9-5362-4af7-a86d-59cb772ded42OAI: oai:DiVA.org:ltu-11403DiVA, id: diva2:984353
Merknad
Validerad; 2014; 20140107 (andbra)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2019-11-22bibliografisk kontrollert

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