Rötting, TobiasAyora, CarlosMacías Suárez, FranciscoCaraballo Monge, Manuel AntonioNieto Liñán, José MiguelPérez López, Rafael2025-01-162025-01-162012Francisco Macías, Manuel A. Caraballo, Tobias S. Rötting, Rafael Pérez-López, José Miguel Nieto, Carlos Ayora, 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, Science of The Total Environment, Volume 433, 2012, Pages 323-330, ISSN 0048-9697, https://doi.org/10.1016/j.scitotenv.2012.06.084.1879-1026 (electrónico)0048-9697https://hdl.handle.net/10272/24836Complete metal removal from highly-polluted acid mine drainage was attained by the use of a pilot multi-step passive remediation system. The remediation strategy employed can conceptually be subdivided into a first section where the complete trivalent metals 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 metals 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 x 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) during more than 3 years.engAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/Acid mine drainageMetal pollution remediationCaustic magnesiaHydrozincitejournal articledoi.org/10.1016/j.scitotenv.2012.06.084open access25 Ciencias de la Tierra y del Espacio