Title:
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From highly polluted Zn-rich acid mine drainage to non-metallic waters: Implementation of a multi-step alkaline passive treatment system to remediate metal pollution
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Author:
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Macías, Francisco; Caraballo, Manuel A.; Roetting, Tobias Stefan; Pérez López, Rafael; Nieto, José Miguel; Ayora Ibáñez, Carlos
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Other authors:
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Universitat Politècnica de Catalunya. GHS - Grup d'Hidrologia Subterrània |
Abstract:
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Complete metal removal from highly-polluted acid mine drainage was attained by the use of a pilot multistep passive remediation system. The remediation strategy employed can conceptually be subdivided into a first section where the complete trivalent metal removal was achieved by the employment of a previously tested limestone-based passive remediation technology followed by the use of a novel reactive substrate (caustic magnesia powder dispersed in a wood shavings matrix) obtaining a total divalent metal precipitation.
This MgO-step was capable to abate high concentrations of Zn together with Mn, Cd, Co and Ni below the recommended limits for drinking waters. A reactive transport model anticipates that 1 m3 of MgO-DAS (1 m thick×1 m2 section) would be able to treat a flow of 0.5 L/min of a highly acidic water (total acidity of 788 mg/L CaCO3) for more than 3 years. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia subterrània -Groundwater -- Pollution -Acid mine drainage -Metal pollution remediation -Caustic magnesia -Brucite -Hydrozincite -Aqüífers -- Contaminació |
Rights:
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Document type:
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Article - Published version Article |
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