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Heavy Metal Contamination and the Roles of Retention Pond and Hydrologic Mixing for Removal of Heavy Metals in Mine Drainage, Kwangyang Au-Ag Mine Area  

정헌복 (고려대학교 지구환경과학과)
윤성택 (고려대학교 지구환경과학과)
김순오 (고려대학교 지구환경과학과)
소칠섭 (고려대학교 지구환경과학과)
정명채 (세명대학교 자원환경공학과)
Publication Information
The Journal of Engineering Geology / v.13, no.1, 2003 , pp. 29-50 More about this Journal
Abstract
Physicochemical Properties of acid mine water of the Chonam-ri Creek and the Sagok-ri Creek in the Kwangyang Au-Ag mine area were determined using geochemical approaches. Metal contamination (Cd, Cu, Pb, Zn) is more serious in the Chonam-ri Creek than in the Sagok-ri Creek. However, the contents of Al and Fe is higher in the Sagok-ri Creek. Such differences between the two creeks probably reflect the abundance and composition of ore minerals. The attenuation processes for acid mine water in both creeks were investigated. In the Chonam-ri Creek, a small retention pond which contains limestone plays an important role in the removal of heavy metals by adsorption or coprecipitation due to increase of pH. The capacity of metal scavenging in this pond depends on the seasonal variation of inflow volume. Reddish yellow precipitates sampled in the Chonam-ri Creek were analyzed by XRD, SEM-EDS, EPMA, and chemical decomposition. The precipitates mainly consist of goethite and are also enriched in Al, Mn, Cu and Zn. This inditates that precipitation of goethite is important for scavenging those trace elements, possibly due to adsorption or coprecipitation. In the Sagok-ri Creek, on the other hand, hydrologic mixing of uncontaminated tributaries results in removal of heavy metals with iron hydroxides precipitation due to the pH increase. The mechanisms proposed for metal attenuation at the confluence between contaminated mine water and uncontaminated tributary water are also explained by the property-property plots.
Keywords
acid mine drainage (AMD); heavy metals; retention pond; mixing; adsorption; coprecipitation; reddish yellow precipitates;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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