Bioleaching of heavy metals from contaminated alkaline sediment by auto-and heterotrophic bacteria in a stirred tank reactor

摘要：

This study deals with bioremediation treatments of Xiangjiang River alkaline sediment contaminated by multiple metals with the mixed culture of auto-and heterotrophic bacteria. Bioleaching resulted in removal of heavy metals at relatively high levels, the efficiency of Zn, Mn, Cu and Cd was 95. 2％ 94. 2％ 90. 1％ and 84. 4％ , respectively. By contrast, the efficiency of As, Hg and Pb was 26. 0％ , 15. 9％ , 19. 9％ , respectively. Analysis of the changes in fraction of heavy metals before and after bioleaching by selective sequential extraction demonstrated that distribution of the metal fractions varied widely in the original sediment, and they were mainly bound to organic associated forms and residual forms after bioleaching. Moreover, the community structure of the leachate and sediment was largely different. The results create new perspectives for the bioremediation technology that can remove heavy metals from highly contaminated sediments.

关键词： bioleaching sediment heavy metals fraction auto and heterotrophic bacteria

作者: Jianyu Zhu Jingxia Zhang Qian Li Tao Han Yuehua Hu Xueduan Liu Wenqing Qin Liyuan Chai Guanzhou Qiu

作者单位: School of Minerals Processing and Bioengineering, Central South University, 410083, Changsha, China School of Minerals Processing and Bioengineering, Central South University, 410083, Changsha, China School of Minerals Processing and Bioengineering, Central South University, 410083, Changsha, China Key Laboratory of Biometallurgy of Ministry of Education, Central South University, 410083, Changsha

会议类型: 国际会议

会议名称: The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)

会议地点: 长沙

会议语种:英文

页码: 1122-1127

在线出版日期: 2011-09-18（万方平台首次上网日期，不代表论文的发表时间）