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Groundwater chemistry affected by trace elements (As, Mo, Ni, U and V) from a burning alum shale waste deposit, Kvarntorp, Sweden
Örebro University, School of Science and Technology. (Man-Technology-Environment Research Centre)ORCID iD: 0000-0002-7680-1117
Örebro University, School of Science and Technology. (Man-Technology-Environment Research Centre)ORCID iD: 0000-0001-7845-6495
Örebro University, School of Science and Technology. (Man-Technology-Environment Research Centre)ORCID iD: 0000-0002-2104-4593
Örebro University, School of Science and Technology. (Man-Technology-Environment Research Centre)ORCID iD: 0000-0002-2674-4994
2021 (English)In: Environmental Science and Pollution Research, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 28, no 23, p. 30219-30241Article in journal (Refereed) Published
Abstract [en]

Worldwide, black shales and shale waste are known to be a potential source of metals to the environment. This project demonstrates ongoing weathering and evaluates leaching processes at a 100-m-high shale waste deposit closed in the 1960s. Some deep parts of the deposit are still burning with temperatures exceeding 500 °C. To demonstrate ongoing weathering and leaching, analyses of groundwater and solid samples of shale and shale waste have been undertaken. Largest impact on groundwater quality was observed downstream the deposit, where elevated temperatures also indicate a direct impact from the burning waste deposit. Groundwater quality is largely controlled by pH and redox conditions (e.g., for arsenic, nickel, molybdenum, uranium and vanadium), and the mixture of different waste materials, including pyrite (acidic leachates) and carbonates (neutralizing and buffering pH). Analyses of shale waste from the deposit confirm the expected pyrite weathering with high concentrations of iron, nickel and uranium in the leachates. No general time trends could be distinguished for the groundwater quality from the monitoring in 2004-2019. This study has shown that black shale waste deposits can have a complex long-term impact on the surrounding environment.

Place, publisher, year, edition, pages
Springer, 2021. Vol. 28, no 23, p. 30219-30241
Keywords [en]
Black shale, Groundwater chemistry, Trace elements
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:oru:diva-89618DOI: 10.1007/s11356-021-12784-2ISI: 000617854700001PubMedID: 33586108Scopus ID: 2-s2.0-85101014604OAI: oai:DiVA.org:oru-89618DiVA, id: diva2:1528559
Note

Funding Agency:

Örebro University  

Available from: 2021-02-16 Created: 2021-02-16 Last updated: 2021-11-23Bibliographically approved

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Åhlgren, KristinaSjöberg, ViktorAllard, B.Bäckström, Mattias

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