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Sökning: WFRF:(Muniruzzaman M.) > (2020-2021) > Weathering of unsat...

Weathering of unsaturated waste rocks from Kevitsa and Hitura mines : Pilot-scale lysimeter experiments and reactive transport modeling

Muniruzzaman, Muhammad (författare)
Water Management Solutions, Geological Survey of Finland, Vuorimiehentie 5, 02151, Espoo, Finland; Department of Environmental Engineering, Technical University of Denmark, Miljøvej, Building 115, 2800, Kgs. Lyngby, Denmark
Karlsson, Teemu (författare)
Luleå tekniska universitet,Geovetenskap och miljöteknik,Circular Economy Solutions, Geological Survey of Finland, Neulaniementie 5, 70211, Kuopio, Finland
Ahmadi, Navid (författare)
Department of Environmental Engineering, Technical University of Denmark, Miljøvej, Building 115, 2800, Kgs. Lyngby, Denmark
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Kauppila, Päivi M. (författare)
Circular Economy Solutions, Geological Survey of Finland, Neulaniementie 5, 70211, Kuopio, Finland
Kauppila, Tommi (författare)
Circular Economy Solutions, Geological Survey of Finland, Neulaniementie 5, 70211, Kuopio, Finland
Rolle, Massimo (författare)
Department of Environmental Engineering, Technical University of Denmark, Miljøvej, Building 115, 2800, Kgs. Lyngby, Denmark
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Water Management Solutions, Geological Survey of Finland, Vuorimiehentie 5, 02151, Espoo, Finland; Department of Environmental Engineering, Technical University of Denmark, Miljøvej, Building 115, 2800, Kgs Lyngby, Denmark Geovetenskap och miljöteknik (creator_code:org_t)
Elsevier, 2021
2021
Engelska.
Ingår i: Applied Geochemistry. - : Elsevier. - 0883-2927 .- 1872-9134. ; 130
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • The fundamental understanding of hydrogeochemical processes leading to toxic drainage in mining environments is of utmost importance to predict the impact of mining activities in waste facilities and to design effective measures for the mitigation of environmental risk. This study investigates the weathering behavior of different types of mine waste rocks, with considerably different mineralogical and textural properties, by performing long-term (> 3 years) pilot-scale lysimeter experiments combined with multiphase and multicomponent reactive transport modeling. The experiments were carried out in a series of five lysimeter setups, packed with unsaturated waste rocks collected from the Kevitsa and Hitura mine sites in Finland, under the influence of outdoor atmospheric conditions. We focus on the temporal dynamics of the waste rock effluents’ chemistry showing remarkably different compositions in different experiments. The low-sulfide containing Kevitsa pyroxene and Hitura serpentinite waste rocks lead to alkaline drainage, characterized by higher pH (up to 9.5) and lower dissolved constituents (e.g., up to 420 mg/L SO4, 89 μg/L Ni). In contrast, the effluents from the Hitura mica schist waste rocks, which have relatively higher sulfide abundance, show characteristics of acidic drainage with lower pH (∼4.3) and orders of magnitude higher aqueous concentrations (e.g., up to 3100 mg/L SO4, 130 mg/L Ni). The results also show that the presence of a higher fraction of finer particles leads to a faster dissolution rate and thus relatively higher drainage concentrations. The experimental results were quantitatively interpreted with multiphase and multicomponent reactive transport modeling, which allowed capturing the complex dynamic trends and the concentration levels observed in the effluents of the different pilot-scale lysimeters.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)

Nyckelord

Acid mine drainage
alkaline mine drainage
Lysimeter experiments
Reactive transport modeling
Waste rocks
Applied Geochemistry
Tillämpad geokemi

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