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  • 1.
    Bergbäck, Bo
    et al.
    Kalmar högskola.
    Eklund, Mats
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska högskolan.
    Lohm, Ulrik
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
    Sviden, John
    Tema V LIU.
    Duration of soil cadmium and lead pollution from shale-based alum production1997Ingår i: Journal of Geochemical Exploration, ISSN 0375-6742, E-ISSN 1879-1689, Vol. 58, s. 309-317Artikel i tidskrift (Refereegranskat)
  • 2.
    Ebena, Gustav
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Biologi. Linköpings universitet, Tekniska högskolan.
    Hagberg, J.
    MTM, Department of Natural Sciences, Örebro University, 701 82 Örebro, Sweden.
    Carlsson, E.
    Div. Applied geology, Department of Environmental Engineering, Luleå University of Technology, 971 87 Luleå, Sweden.
    Origin and distribution of low molecular weight organic acids and bacteria in a depth profile of a soil covered tailings impoundment in northern Sweden2007Ingår i: Journal of Geochemical Exploration, ISSN 0375-6742, E-ISSN 1879-1689, Vol. 92, nr 2-3, s. 186-195Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The tailings at Kristineberg, northern Sweden, have a very low content of organic carbon, a feature common with many sulfidic tailing impoundments. Three different experiments were set-up to assess the role of carbon dioxide in a depth profile. Firstly, pore gas was collected in vials from ground water pipes at various points in the profile of a dry covered tailings impoundment and analyzed in the laboratory for CO2, O2, N2, H2, and CH4 contents. Secondly, pore water was extracted from tension lysimeters at various depths. This water was analyzed for numbers of bacteria (iron-oxidizing and sulfur-oxidizing, both by MPN), and low molecular weight organic acids. Thirdly, Acidithiobacillus ferrooxidans (Strain DSMZ No 1927) was grown on a mixture of irradiated tailings and sterile water. The amount of organic acids produced was monitored. The largest bacterial count of iron-oxidizing bacteria, 4.7 × 105/g tailings, was at the oxidation front, while the heterotrophic sulfur-oxidizing bacteria were mainly found in the unsaturated, oxidized zone, 2.65 × 104/g tailings. The oxidation front was also the location where the largest amount of organic acids was found in the field study (formate 0.83 mg/l and acetate 0.51 mg/l). The acetic acid found coincides with the highest count of iron-oxidizing bacteria. The intrusion of O2 and CO2 at the studied location is enough for microbiological activity, although the overall effect on AMD production is not addressed. The results from laboratory incubations indicate that the microbial community produces organic carbon with CO2 as the sole carbon source, up to 1.35 mg/l after 16 weeks measured as TOC. To conclude, we suggest that knowledge of the intrusion of both CO2 and O2 is vital for a full understanding of the microbial ecology, and thus the weathering processes, in a dry covered tailings impoundment. Hence, the CO2 produced in the till cover and entering the tailings ecosystem is crucial to the function of the ecosystem. © 2007 Elsevier B.V. All rights reserved.

  • 3. Holmstrom, H.
    et al.
    Ohlander, B.
    Öhlander, B., Division of Applied Geology, Luleå University of Technology, SE-97187 Luleå, Sweden.
    Layers rich in Fe- and Mn-oxyhydroxides formed at the tailings-pond water interface, a possible trap for trace metals in flooded mine tailings2001Ingår i: Journal of Geochemical Exploration, ISSN 0375-6742, E-ISSN 1879-1689, Vol. 74, nr 1-3, s. 189-203Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Geochemical field studies of the flooded sulphide-rich mine tailings at Stekenjokk in northern Sweden have been performed. Minor diffusion of elements from the tailings to the pond water is occurring. The diffusion rate is higher where tailings that were oxidised before the flooding have been deposited. Layers rich in Fe-and Mn-oxyhydroxides have been developed close to the tailings surface, and a layer of natural sediments rich in organic material have developed on the tailings surface since the flooding. The oxyhydroxides adsorb and/or co-precipitate metals and function as a trap for released metals at the tailings-pond water interface, thereby decreasing the diffusion rate from the tailings pore water to the pond water at the sediment-water interface. This study shows that it is possible for a deposit of flooded tailings to reach a state when it almost functions as a natural lake in northerly areas, with Fe-and Mn-oxyhydroxide layers controlling the diffusion of metals into the overlying pond water, within a relatively short time after remediation. © 2001 Elsevier Science B.V. All rights reserved.

  • 4.
    Lundgren, T.
    Envipro Miljöteknik AB, Repslagaregatan 19, Linkoping S-582 22, Sweden.
    The dynamics of oxygen transport into soil covered mining waste deposits in Sweden2001Ingår i: Journal of Geochemical Exploration, ISSN 0375-6742, E-ISSN 1879-1689, Vol. 74, nr 1-3, s. 163-173Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    One important objective in covering sulphide mining waste deposits with soil layers is to reduce the transport of oxygen to the waste. Irregular, unexpected and significant peaks were recorded in oxygen concentrations in a covered waste rock dump. They initiated a series of internal gas pressure recordings that were carried out in three covered sulphide waste deposits - one tailings impoundment and two waste rock deposits. All are situated in Sweden. Significant pressure variations were found in the covered waste. Sudden changes in ambient air pressure resulted in corresponding variations in the dumps. During periods with stable air pressures, even gravitational pressure variations (tidal effects) were experienced. The amplitude is about half the corresponding external variation. Approximate calculations show that the pressure variations are too low to explain the experienced peaks in oxygen concentration. The pressure recordings have verified that the covers as a whole act as tight barriers and that oxidation of sulphides due to advective transport of oxygen is probably of little importance, at least if the imperfections in the covers are reasonably small. © 2001 Elsevier Science B.V. All rights reserved.

  • 5.
    Routh, Joyanto
    et al.
    Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden.
    Bhattacharya, Aparajita
    Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden.
    Saraswathy, Ambujom
    Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden.
    Jacks, Gunnar
    Department of Land and Water Resources Engineering, KTH, Stockholm, Sweden.
    Bhattacharya, Prosun
    Department of Land and Water Resources Engineering, KTH, Stockholm, Sweden.
    Arsenic remobilization from sediments contaminated with mine tailings near the Adak mine in Vasterbotten district (northern Sweden)2007Ingår i: Journal of Geochemical Exploration, ISSN 0375-6742, E-ISSN 1879-1689, Vol. 92, nr 1, s. 43-54Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Weathering of mine tailings have resulted in high As concentrations in water (up to 2900 mu g 1(-1)) and sediment (up to 900 mg kg(-1)) samples around the Adak mine. Notably, As occurs as As(III) species (15-85%) in the oxic surface and ground water samples, which is not common. Time-series based sediment incubations were set up in the laboratory with contaminated sediments to study the microbial processes involved in transformation and remobilization of As across the sediment-water interface. The microcosm experiments indicate that microorganisms are capable of surviving in As-rich sediments and reduce As(V) to As(III). A decrease in total As concentration in sediments is coupled to an increase in As(Ill) concentration in the aqueous media. In contrast, the controls (treated with HgCl, and formaldehyde) did not show growth, and As(V) concentrations increased steadily in the sediments and aqueous medium. The results imply that active metabolism is necessary for As(V) reduction. These microorganisms possess reduction mechanisms that are not necessarily coupled to respiration, but most likely impart resistance to As toxicity.

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