Huang Qingyun, Yu Zhen, Pang Ya, Wang Yueqiang, Cai Zhihong
College of Bioscience and Biotechonology, Hunan Agricultural University, Changsha, 410128, People's Republic of China.
Bull Environ Contam Toxicol. 2015 Apr;94(4):519-24. doi: 10.1007/s00128-015-1500-1. Epub 2015 Feb 14.
In this study, bioleaching was coupled with electrokinetics (BE) to remove heavy metals (Cu, Zn, Cr and Pb) from contaminated soil. For comparison, bioleaching (BL), electrokinetics (EK), and the chemical extraction method were also applied alone to remove the metals. The results showed that the BE method removed more heavy metals from the contaminated soil than the BL method or the EK method alone. The BE method was able to achieve metal solubilization rates of more than 70 % for Cu, Zn and Cr and of more than 40 % for Pb. Within the range of low current densities (<1 mA cm(-2)), higher current density led to more metal removal. However, the metal solubilization rates did not increase with increasing current density when the current density was higher than 1 mA cm(-2). Therefore, it is suggested that bioleaching coupled with electrokinetics can effectively remediate heavy metal-contaminated soils and that preliminary tests should be conducted before field operation to detect the lowest current density for the greatest metal removal.
在本研究中，生物淋滤与动电技术（BE）相结合，用于去除污染土壤中的重金属（铜、锌、铬和铅）。为作比较，还单独应用了生物淋滤（BL）、动电技术（EK）和化学萃取法来去除这些金属。结果表明，与单独的BL法或EK法相比，BE法从污染土壤中去除的重金属更多。BE法对铜、锌和铬的金属溶解率能达到70%以上，对铅的溶解率能达到40%以上。在低电流密度（<1 mA cm(-2)）范围内，较高的电流密度能导致更多的金属去除。然而，当电流密度高于1 mA cm(-2)时，金属溶解率不会随着电流密度的增加而提高。因此，建议生物淋滤与动电技术相结合可有效修复重金属污染土壤，并且在现场操作前应进行初步试验，以检测实现最大金属去除量的最低电流密度。
