Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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Temporal and Spatial Variation and Removal Efficiency of Heavy Metals in the Stream Water Affected by Leachate from the Jiknaegol Tailings Impoundment of the Yeonhwa II Mine

제2연화광산 직내골 광미장 침출수에 오염된 하천수계의 시.공간적 수질변화 및 중금속 제거효율

  • Lee, Pyeong-Koo (Department of Geological and Environmental Hazards, Korea Institute of Geoscience and Mineral Resources) ;
  • Kang, Min-Ju (Department of Soil and Ground Water, Korea Environment Corporation) ;
  • Choi, Sang-Hoon (Department of Earth and Environmental Sciences, Chungbuk National University)
  • 이평구 (한국지질자원연구원 지질환경재해연구부) ;
  • 강민주 (한국환경공단 토양지하수처) ;
  • 최상훈 (충북대학교 지구환경과학과)
  • Received : 2010.07.15
  • Accepted : 2010.09.09
  • Published : 2011.02.28
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Abstract

This study had been carried out to investigate spatial and temporal variations of the concentrations of trace metals for contaminated surface water in creek affected by leachate from the tailings impoundment of the Yeonhwa II mine for about 2 years. It was also to ascertain the metal removal efficiency for potentially deleterious metals by the artificial and natural attenuation processes such as retention ponds and hydrologic mixing of uncontaminated tributaries. The concentrations of As, Pb, Cd, and Cu for leachate in the rainy season were not detected. On the other hand, the concentrations of Zn, Fe, Mn, Al, and $SO_4^{2-}$ in the rainy season for leachate were 2-66 times higher than those in the dry season, due to the oxidation of the sulfide minerals and the dissolution of the secondary minerals. The concentrations of Zn and Cd for leachate and surface water of the upper creek in the rainy season exceeded the criteria of River Water Quality and Drinking Water Quality but in the dry season, those of analyzed all the metals (As, Pb, Cd, Cu, Zn, Cd, Fe, Mn, and Al) for surface water sampled at the study area were below the criteria of River Water Quality and Drinking Water Quality. In regard of the attenuation efficiency for the concentrations of metals, Fe, Mn, Al, Zn, Cd, As, and Cu were removed highly at retention ponds, while the removal efficiency for major cations and sulfate ($SO_4^{2-}$) were related to mixing of the uncontaminated tributaries. Therefore, the major attenuation processes of the metal and sulfate contents in creek affected by leachate from a tailing dump were precipitation (accompanied by metal co-precipitation and sorption), water dilution, and neutralization.

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References

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