Effectiveness of various dispersed alkaline substrates for the pre-treatment of ferriferous acid mine drainage |
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| Institution: | 1. Research Institute on Mines and Environment (RIME)-University of Quebec in Abitibi-Temiscamingue (UQAT), Rouyn-Noranda, QC, Canada;2. RIME- Polytechnique Montreal, Department of Civil, Geological, and Mining Engineering, Polytechnique Montreal, Montreal, QC, Canada;1. University of Oulu, Department of Chemistry, FIN-90014 University of Oulu, P.O. Box 3000, Finland;2. Oulu Water Alliance Ltd., Kaitoväylä 1 F2, FIN-90570 Oulu, Finland;3. University of Oulu, Thule Institute, FIN-90014 University of Oulu, P.O. Box 7300, Finland;4. Kokkola University Consortium Chydenius, Talonpojankatu 2B, FIN-67100 Kokkola, Finland;1. Earth Science Department, University of Huelva, Campus “El Carmen”, E-21071 Huelva, Spain;2. Mining Engineering Department, University of Chile, Avda. Tupper 2069, Santiago, Chile;3. Advanced Mining and Technology Center, University of Chile, Avda. Tupper 2007, Santiago, Chile;1. LCME, Faculté des Sciences et Techniques, Univ Cadi Ayyad, Marrakech, BP549, 40000 Marrakech, Maroc;2. Univ du Québec en Abitibi Témiscamingue, Chaire de recherche du Canada en Gestion intégrée des rejets miniers, 445 Boul de l’Université, Rouyn-Noranda, QC, Canada J9X 5E4;3. INSA de Lyon, Laboratoire de Génie Civil et d’Ingénierie Environnementale, Bât. Sadi Carnot, 9, rue de la physique, 69621 Villeurbanne Cedex, France;1. Centre in Water Research and Development, University of the Witwatersrand, Johannesburg, South Africa;2. Industrial Mine Water Research Unit (IMWaRU), School of Chemical and Metallurgical Engineering (CHMT), University of the Witwatersrand, Johannesburg, South Africa;3. Helmholtz Centre for Environmental Research-UFZ, Department of Environmental Biotechnology, Leipzig, Germany;4. Mineral-Metal Recovery and Recycling (MMR&R) Research Group, Mineral Processing Division, Department of Mining Engineering, Suleyman Demiral University, TR32260 Isparta, Turkey |
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| Abstract: | Dispersed alkaline substrates (DAS) have been successfully used in passive treatment of highly contaminated acid mine drainage (AMD) to limit coating and clogging issues. However, further optimization of DAS systems is still needed, especially for their long-term efficiency during the treatment of ferriferous AMD. In the present study, three types of DAS comprised of natural alkaline materials (wood ash, calcite, dolomite), in different proportions (20%v/v, 50%v/v, 80%v/v), and a substrate with high surface area (wood chips) were tested in 9 batch reactors. The testing was carried out, in duplicate, for a period of 91 days, to evaluate the comparative performance of the mixtures for iron pre-treatment in ferriferous AMD (2500 mg/L Fe, at pH 4). Results showed increasing of pH (between 4.15 and 7.12), regardless of the proportion of alkaline materials in the DAS mixtures. Among the tested mixtures, wood ash type DAS were more effective for Fe removal (99.9%) than calcite or dolomite type DAS (up to 66%). All tested DAS had limited efficiency for sulfate removal and an additional treatment unit, such as a sulfate-reducing biochemical reactor, is needed. Moreover, due to the similar performances of the calcite and dolomite DAS, they could be potentially substituted and rather be used in a polishing treatment unit. Based on these findings, the most promising mixture was the 50% wood ash type DAS (WA50-DAS). |
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| Keywords: | Ferriferous acid mine drainage Iron pre-treatment Dispersed alkaline substrate Calcite Dolomite ALD"} {"#name":"keyword" "$":{"id":"kwrd0040"} "$$":[{"#name":"text" "_":"Anoxic limestone drains AMD"} {"#name":"keyword" "$":{"id":"kwrd0050"} "$$":[{"#name":"text" "_":"Acid mine drainage DAS"} {"#name":"keyword" "$":{"id":"kwrd0060"} "$$":[{"#name":"text" "_":"Dispersed alkaline substrate LOI"} {"#name":"keyword" "$":{"id":"kwrd0070"} "$$":[{"#name":"text" "_":"Loss on ignition NFOL"} {"#name":"keyword" "$":{"id":"kwrd0080"} "$$":[{"#name":"text" "_":"Natural Fe-oxidizing lagoon OLD"} {"#name":"keyword" "$":{"id":"kwrd0090"} "$$":[{"#name":"text" "_":"Oxic limestone drains PBR"} {"#name":"keyword" "$":{"id":"kwrd0100"} "$$":[{"#name":"text" "_":"Passive bioreactor WA-DAS"} {"#name":"keyword" "$":{"id":"kwrd0110"} "$$":[{"#name":"text" "_":"Wood ash-dispersed alkaline substrate |
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