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Bioleaching of Heavy Metals from Shooting Range Soil Using a Sulfur-Oxidizing Bacteria Acidithiobacillus thiooxidans  

Han, Hyeop-Jo (Department of Energy and Resources Engineering, Chonnam National University)
Lee, Jong-Un (Department of Energy and Resources Engineering, Chonnam National University)
Ko, Myoung-Soo (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology)
Choi, Nag-Choul (Engineering Research Institute, Chonnam National University)
Kwon, Young-Ho (Halla Engineering and Construction Co.)
Kim, Byeong-Kyu (Halla Engineering and Construction Co.)
Chon, Hyo-Taek (Department of Energy Resources Engineering, Seoul National University)
Publication Information
Economic and Environmental Geology / v.42, no.5, 2009 , pp. 457-469 More about this Journal
Abstract
Applicability of bioleaching techniques using a sulfur-oxidizing bacteria, Acidithiobacillus thiooxidans, for remediation of shooting range soil contaminated with toxic heavy metals was investigated. The effects of sulfur concentration, the amount of bacterial inoculum and operation temperature on the efficiency of heavy metal solubilization were examined as well. As sulfur concentration and the amount of bacterial inoculum increased, the solubilization efficiency slightly increased; however, significant decrease of heavy metal extraction was observed with no addition of sulfur or bacterial inoculum. Bacteria solubilized the higher amount of heavy metals at $26^{\circ}C$ than $4^{\circ}C$. Lead showed the highest removal amount from the contaminated soil but the lowest removal efficiency when compared with Zn, Cu and Cr. It was likely due to formation of insoluble $PbSO_{4(s)}$ as precipitate or colloidal suspension. Sequential extraction of the microbially treated soil revealed that the proportion of readily extractable phases of Zn, Cu and Cr increased by bacterial leaching, and thus additional treatment or optimization of operation conditions such as leaching time were required for safe reuse of the soil. Bioleaching appeared to be a useful strategy for remediation of shooting range soil contaminated with heavy metals, and various operating conditions including concentration of sulfur input, inoculum volume of bacteria, and operation temperature exerted significant influence on bioleaching efficiency.
Keywords
bioleaching; sulfur-oxidizing bacteria; heavy metals; shooting range soil; Acidithiobacillus thiooxidans;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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