Heterotrophic bioleaching of heavy metal-polluted soil by using Aspergil/us niger
The possibility of removal of contaminated metals from soil by bioleaching with heterotrophic microorganism was investigated in batch laboratory experiments. Results showed that the isolate A80 was closely relative to Aspergillus niger with 99% sequence similarity according to the phylogenetic analysis of ITS rDNA sequences. Soil bioleaching experiments found that after 8 days of bioleaching with A. niger A80, a decrease in soil pH from ~ 6. 0 to ~ 2. 6 was observed in the two bioleaching processes using sole sucrose or standard sucrose medium as nutrient sources, and that 82% -88% of Cu, 26% -49% of Zn, and 15% -39% of Pb were removed from the soil, respectively. These findings suggest the potential of the sucrose-based heterotrophic bioleaching process for the cleanup of heavy metalpolluted soil.
heterotrophic microorganism bioleaching soil metal solubilisation
Di Fang Jie Li
Department of Environmental Engineering, Ocean University of China, 266100, Qingdao, China
国际会议
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
长沙
英文
694-697
2011-09-18(万方平台首次上网日期,不代表论文的发表时间)