Removal of Arsenic from Leachate of Tailing using Laboratory-synthesized Zerovalent Iron

  • Kim, Soon-Oh (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Jung, Young-Il (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Cho, Hyen-Goo (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Park, Won-Jeong (Graduate School of Department of Agricultural Chemistry, BK21 Hazard Material Management Group, Institute of Agricultural Science and Technology, College of Agricultural and Life Sciences, Chonnam National University) ;
  • Kim, In-Seon (Graduate School of Department of Agricultural Chemistry, BK21 Hazard Material Management Group, Institute of Agricultural Science and Technology, College of Agricultural and Life Sciences, Chonnam National University)
  • Published : 2007.03.30

Abstract

Feasibility of laboratory-synthesized zerovalent iron was investigated to remove arsenic from leachates of tailings taken from an Au-Ag abandoned mine. The tailings were seriously contaminated with arsenic, and its potential adverse effect on the ecosystems around the mine seems to be significantly high. Long-term column experiments were conducted for about 3.5 months to evaluate the effectiveness of the synthesized zerovalent iron for removal of arsenic. Over than 95% removal efficiency of As was observed in the zerovalent iron mediated tests. In addition, the XRD data suggest that the corrosion products of ZVI were identified magnetite, maghemite, goethite, and lepidocrocite, all of which support Fe(II) oxidation as an intermediate step in the zerovalent iron corrosion process. The results indicate that arsenic can be removed from the tailing-leachate by the mechanism of coprecipitation and/or adsorption onto those iron oxides formed from ZVI corrosion.

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