Groundwater chemistry affected by trace elements (As, Mo, Ni, U and V) from a burning alum shale waste deposit, Kvarntorp, Sweden
| Autor: | Mattias Bäckström, Bert Allard, Viktor Sjöberg, Kristina Åhlgren |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Groundwater chemistry
Health Toxicology and Mutagenesis chemistry.chemical_element Weathering 010501 environmental sciences engineering.material 010502 geochemistry & geophysics 01 natural sciences Environmental Chemistry Leachate Leaching (agriculture) Groundwater Arsenic 0105 earth and related environmental sciences Sweden Trace elements General Medicine Uranium Pollution chemistry Environmental chemistry engineering Alum Compounds Environmental science Pyrite Oil shale Black shale Environmental Monitoring Research Article |
| Zdroj: | Environmental Science and Pollution Research International |
| ISSN: | 1614-7499 0944-1344 |
| DOI: | 10.1007/s11356-021-12784-2 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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