氧化亚铁硫杆菌对电子垃圾焚烧迹地重金属形态的影响简

采用生物淋滤法处理电子垃圾焚烧迹地重金属严重污染的土壤。所用氧化亚铁硫杆菌是从矿坑废水中通过一系列培养、分离和纯化得到。实验结果表明，生物淋滤法可以有效地去除土壤中重金属Cu、Pb和Zn，去除率的大小顺序为Zn>Cu>Pb；采用五步连续提取法分析处理前后土壤中重金属的存在形态，结果表明，通过氧化亚铁硫杆菌处理受重金属污染的土壤，可以促使易移动的重金属结合态的溶解（可交换态、碳酸盐结合态和Fe-Mn氧化物结合态），并使难移动的重金属结合态向易移动的重金属结合态转变。

Partitioning variation of heavy metals in contaminated soil by e-waste open burning activities via Thiobacillus Ferrooxidans bioleaching

Metal removal by biological solubilization in strongly contaminated soil by e-waste open burning activities was carried out in shake flask experiments. Thiobacillus ferrooxidans isolated from coal mine water was used for bioleaching. The order of average solubilization efficiency of total extractable heavy metals was Zn>Cu>Pb. Variations in the binding forms of heavy metals were evaluated using a five-step sequential extraction procedure before and after the bioleaching. The bioleaching process caused prompt solubilization of metals mostly associated with the more labile fractions (exchangeable, carbonated and Fe-Mn oxide bound metals), whereas those associated to the less labile ones (organic/residue fractions) were exchanged towards more labile fractions. The results of this study indicated that the bioleaching process can be useful for efficient removal of heavy metals from soil.