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dc.contributor.author Masindi, Vhahangwele
dc.contributor.author Gitari, MW
dc.contributor.author Tutu, H
dc.contributor.author De Beer, Morris
dc.date.accessioned 2017-07-28T08:54:46Z
dc.date.available 2017-07-28T08:54:46Z
dc.date.issued 2016-03
dc.identifier.citation Masindi, V., Gitari, M.W., Tutu, H. and De Beer, M. 2016. Fate of inorganic contaminants post treatment of acid mine drainage by cryptocrystalline magnesite: Complimenting experimental results with a geochemical model. Journal of Environmental Chemical Engineering, doi:10.1016/j.jece.2016.03.020. en_US
dc.identifier.uri http://www.sciencedirect.com/science/article/pii/S2213343716300999?
dc.identifier.uri http://hdl.handle.net/10204/9288
dc.description Copyright: 2016 Elsevier. Due to copyright restrictions, the attached PDF file contains the abstract of the full text item only. For access to the full text item, kindly contact the publisher's website. en_US
dc.description.abstract This study assessed the fate of inorganic contaminants post treatment of acid mine drainage by cryptocrystalline magnesite. To accomplish that, neutralization and metal attenuation were evaluated and complemented with simulations using geochemical modeling. Mineral phase formation and changes during the reaction of magnesite and AMD were also evaluated. The geochemical computer code PHREEQC and WATEQ4 database was used for geochemical modelling of the process water. Interaction of AMD with magnesite at an optimum solid: liquid ratio of 1:100 and contact time of 60 min led to an increase in pH, reaching a maximum pH of 10, resulting in significant precipitation of most metal species. Increase of pH in solution with contact time caused the removal of the metal ions mainly by precipitation, co-precipitation and adsorption. Sulphate concentration was lowered from 4640 down to 1910 mg/L. Fe was mainly removed as Fe(OH)(sub3), goethite, and jarosite, Al as basaluminite, boehmite and jurbanite, Al(OH)3 and as gibbsite and diaspore. Al and Fe precipitated as iron (oxy)-hydroxides and aluminium (oxy)-hydroxides. Mn precipitated as rhodochrosite and manganite. Ca was removed as gypsum. Sulphate was removed as gypsum, and Fe, Al hydroxyl sulphate minerals. Mg was removed as brucite and dolomite. Cryptocrystalline magnesite effectively neutralized AMD and attenuated concentration of inorganic species to within department of water affairs and sanitation (DWAS) water quality guidelines. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Worklist;16747
dc.subject Acid mine drainage en_US
dc.subject AMD en_US
dc.subject Magnesite en_US
dc.subject Toxic metals en_US
dc.subject Sulphate en_US
dc.subject Geochemical modelling en_US
dc.title Fate of inorganic contaminants post treatment of acid mine drainage by cryptocrystalline magnesite: Complimenting experimental results with a geochemical model en_US
dc.type Article en_US


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