Municipal compost-based mixture for acid mine drainage bioremediation: Metal retention mechanisms |
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| Institution: | 1. School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK;2. Department of Soil Management, Ghent University, Coupure 653, 9000 Gent, Belgium;1. CESAM - Centre of Marine and Environmental Studies, Department of Biology, University of Aveiro, Santiago University Campus, 3810-193 Aveiro, Portugal;2. Centre for Cell Factories and Biopolymers, Griffith Institute for Drug Discovery, Griffith University, Nathan, QLD 4111, Australia;3. Malaghan Institute of Medical Research, Gate 7, Victoria University Central Services Building, Kelburn, Wellington 6012, New Zealand;4. CICECO – Aveiro Institute of Materials, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal |
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| Abstract: | An upflow packed column was operated to evaluate the potential of a mixture of municipal compost and calcite to promote sulphidogenesis in the remediation of a simulated mine water at high flows (>0.1 m d−1). Results showed that the pH was neutralised and metals (Fe, Al, Zn, Cu) were significantly removed. Metal removal was attributed to the combined result of precipitation as metal (oxy)hydroxides and carbonates, co-precipitation with these (oxy)hydroxides and sorption onto the compost surface rather than to precipitation as metal sulphides. The two last mechanisms are especially significant for Zn, whose hydroxide is not expected to precipitate at pH 6–7. Before the saturation of compost sorption sites, 60% of the influent Zn was estimated to have been removed by co-precipitation with Fe- and Al-(oxy)hydroxide and 40% by sorption onto the municipal compost. |
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