School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 261 Oryong-dong, Buk-gu, Gwangju, 500-712, Republic of Korea.
Environ Geochem Health. 2013 Dec;35(6):727-33. doi: 10.1007/s10653-013-9530-2. Epub 2013 May 26.
Bioleaching of As from the soil in an abandoned Ag-Au mine was carried out using Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans. A. ferrooxidans is an iron oxidizer and A. thiooxidans is a sulfur oxidizer. These two microbes are acidophilic and chemoautotrophic microbes. Soil samples were collected from the Myoungbong and Songcheon mines. The main contaminant of the soil was As, with an average concentration of 4,624 mg/kg at Myoungbong and 5,590 mg/kg at Songcheon. A. ferrooxidans and A. thiooxidans generated lower pH conditions during their metabolism process. The bioleaching of As from soil has a higher removal efficiency than chemical leaching. A. ferrooxidans could remove 70 % of the As from the Myoungbong and Songcheon soils; however, A. thiooxidans extracted only 40 % of the As from the Myoungbong soil. This study shows that bioleaching is an effective process for As removal from soil.
采用嗜酸氧化亚铁硫杆菌和嗜酸氧化硫硫杆菌对废弃金银矿土壤中的砷进行了生物淋滤。嗜酸氧化亚铁硫杆菌是一种铁氧化剂，嗜酸氧化硫硫杆菌是一种硫氧化剂。这两种微生物都是嗜酸的化能自养微生物。从 Myoungbong 和 Songcheon 矿采集了土壤样本。土壤的主要污染物是砷，Myoungbong 的平均浓度为 4624mg/kg，Songcheon 的平均浓度为 5590mg/kg。嗜酸氧化亚铁硫杆菌和嗜酸氧化硫硫杆菌在代谢过程中产生较低的 pH 值条件。与化学浸出相比，土壤中砷的生物淋滤具有更高的去除效率。嗜酸氧化亚铁硫杆菌可以从 Myoungbong 和 Songcheon 土壤中去除 70%的砷；然而，嗜酸氧化硫硫杆菌从 Myoungbong 土壤中仅提取了 40%的砷。本研究表明，生物淋滤是从土壤中去除砷的有效方法。
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