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Neutralisation of a...
Neutralisation of an acidic pit lake by alkaline waste products
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- Allard, Bert, 1945- (author)
- Örebro universitet,Institutionen för naturvetenskap och teknik,MTM Biogeosphere Dynamics
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- Bäckström, Mattias, 1974- (author)
- Örebro universitet,Institutionen för naturvetenskap och teknik,MTM Biogeosphere Dynamics
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- Karlsson, Stefan, 1957- (author)
- Örebro universitet,Institutionen för naturvetenskap och teknik,MTM Biogeosphere Dynamics
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- Grawunder, Anja (author)
- Institute of Geoscience, Friedrich Schiller University, Jena, Germany
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(creator_code:org_t)
- 2013-08-03
- 2014
- English.
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In: Environmental Science and Pollution Research. - : Springer. - 0944-1344 .- 1614-7499. ; 21:11, s. 6930-6938
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- A former open pit where black shale (alum shale) was excavated during 1942-1965 has been water filled since 1966. The water chemistry was dominated by calcium and sulphate and had a pH of 3.2-3.4 until 1997-1998, when pH was gradually increasing. This was due to the intrusion of leachates from alkaline cement waste deposited close to the lake. A stable pH of around 7.5 was obtained after 6-7 years. The chemistry of the pit lake has changed due to the neutralisation. Concentrations of some dissolved metals, notably zinc and nickel, have gone down, as a result of adsorption/co-precipitation on solid phases (most likely iron and aluminium hydroxides), while other metals, notably uranium and molybdenum, are present at elevated levels. Uranium concentration is reaching a minimum of around pH 6.5 and is increasing at higher pH, which may indicate a formation of neutral and anionic uranyl carbonate species at high pH (and total carbonate levels around 1 mM). Weathering of the water-exposed shale is still in progress.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- Alum shale; Black shale; Liming; Neutralisation; Pit lake
- Enviromental Science
- Miljövetenskap
Publication and Content Type
- ref (subject category)
- art (subject category)
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