標題: Effects of ferric ion on bioleaching of heavy metals from contaminated sediment
作者: Chen, SY
Lin, JG
Lee, CY
環境工程研究所
Institute of Environmental Engineering
關鍵字: bioleaching;contaminated sediment;enhancement;ferric ion;heavy metal
公開日期: 2003
摘要: Bioleaching is one of the promising procedures for removal of heavy metals from contaminated sediments. The advantages of this biotechnology are that it is easy, efficient, less costly and friendly to the environment. However, the principal disadvantage of this process is its slow kinetics in metal solubilization, which may limit practical application of the bioleaching process. In order to enhance the rate and efficiency of metal solubilization, the ferric ion was used as a catalytic agent in the bioleaching process. It was found that the sediment pH apparently decreased in the bioleaching after addition of ferric ion. The metal solubilization increased quickly after the addition of ferric ion. The rate of metal solubilization was enhanced by the addition of ferric ion, especially for Cr and Pb. An increase in the amount of ferric ion added increased the final efficiency of metal solubilization. The highest final efficiency of metal solubilization was obtained in the bioleaching with 1 g/L of ferric ion. Besides, the growth of sulfur-oxidizing bacteria was not affected by addition of ferric ion in the bioleaching. It was concluded that the kinetics of metal solubilization were enhanced by addition of ferric ion in the bioleaching process.
URI: http://hdl.handle.net/11536/28183
ISSN: 0273-1223
期刊: WATER SCIENCE AND TECHNOLOGY
Volume: 48
Issue: 8
起始頁: 151
結束頁: 158
顯示於類別:會議論文