Characterization of apparent sulfur oxidation activity of thermophiles in bioleaching of chalcopyrite
Bio-oxidation of elemental sulfur using acidophilic sulfur oxidizing microbe, is a complex process. The sulfur oxidation activity of sulfur-oxidizing microbe is an important parameter for bio-oxidation. At present, the sulfur oxidation activity of sulfuroxidizing microbe is characterized indirectly by the evolutions of the cells concentration, pH and sulfate ions concentration in solution. In this article, the sulfur oxidation activities of four pure thermophilic archea Acidianus brierleyi (JCM 8954) , Metallosphaera sedula (YN 23) , Acidianus manzaensis ( YN 25) and Sulfolobus metallicus ( YN 24) and their mixture in bioleaching chalcopyrite were compared. The results showed that the mixed culture, contributed significantly to the raising of leaching rate which suggests that mixed culture had a higher sulfur oxidation activity than that of the pure culture. Meanwhile, the results also indicated that the changes of parameters characterizing the sulfur oxidation activity of thermophiles were often affected by many factors, so it is hard to reflect accurately the specific sulfur oxidation activities among the different sulfur-oxidizing microbes when bioleaching chalcopyrite in different conditions. Accordingly, an efficient method to characterize bacterial sulfur oxidation activity appears to be desirable.
thermophiles sulfur oxidation activity bioleaching
Wei Zhu Jinlan Xia An an Peng Zhenyuan Nie Guanzhou Qiu
School of Minerals Processing and Bioengineering, Central South University, 410083, Changsha, 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
378-382
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）