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Tailored Leaching Tests as a Tool for Environmental Management of Mine Tailings Disposal at Sea
Akvaplan-niva AS, High North Research Centre for Climate and the Environment, 9007 Tromsø, Norway; Department of Chemistry, UiT—The Arctic University of Norway, 9037 Tromsø, Norway.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering. Department of Chemistry, UiT—The Arctic University of Norway, 9037 Tromsø, Norway.ORCID iD: 0000-0002-4497-6529
Akvaplan-niva AS, High North Research Centre for Climate and the Environment, 9007 Tromsø, Norway.
2022 (English)In: Journal of Marine Science and Engineering, E-ISSN 2077-1312, Vol. 10, no 3, article id 405Article in journal (Refereed) Published
Abstract [en]

The expanding human activities in coastal areas increase the need for developing solutions to limit impacts on the marine environment. Sea disposal affects the marine environment, but despite the growing knowledge of potential impacts, there are still no standardized leaching tests for sea disposal. The aim of this study was to contribute to the development of leaching tests, exemplified using mine tailings, planned for submarine disposal in the Repparfjord, Norway. The mine tailings had elevated concentrations of Ba, Cr, Cu, Mn and Ni compared to background concentrations in the Repparfjord. Variables known to affect metal leaching in marine environments (DOC, pH, salinity, temperature, aerated/anoxic) were studied, as was the effect of flocculant (Magnafloc10), planned to be added prior to discharge. Stirred/non-stirred setups simulated the resuspension and disposal phases. Leaching of metals was below 2% in all experiments, with the highest rate observed for Cu and Mn. Multivariate analysis revealed a different variable importance for metals depending on their association with minerals. Higher leaching during resuspension than disposal, and lower leaching with the addition of Magnafloc10, especially for Cu and Mn, was observed. The leaching tests performed in this study are transferable to other materials for sea disposal. 

Place, publisher, year, edition, pages
MDPI, 2022. Vol. 10, no 3, article id 405
Keywords [en]
leaching tests, metals, mine tailings, sea disposal, multivariate models, PLS
National Category
Geochemistry
Research subject
Waste Science and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-89915DOI: 10.3390/jmse10030405ISI: 000774945800001Scopus ID: 2-s2.0-85126510107OAI: oai:DiVA.org:ltu-89915DiVA, id: diva2:1648328
Note

Validerad;2022;Nivå 2;2022-03-30 (hanlid);

Funder: FRAM (MIKON);

Part of special issue: Sediment Remediation at Harbour

Available from: 2022-03-30 Created: 2022-03-30 Last updated: 2024-03-26Bibliographically approved

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Lejon, Tore

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