The effect of KNO3 on substrate utilisation by Sulfobacillus sp. in mixed ferrous ion and tetrathionate growth medium
Similar responses were observed for Sulfobacillus ( Sb. ) acidophilus and Sb. sibiricus but they differed in some of their responses to nitrate from Sb. thermosulfidooxidans. Ferrous-ion adapted cell lines of the three species all commenced ferrous ion oxidation ahead of tetrathionate oxidation and concurrent substrate utilisation was observed under most of the conditions tested. Tetrathionate adapted cell lines of Sb. acidophilus and Sb. sibiricus commenced tetrathionate oxidation ahead of ferrous ion oxidation under all conditions tested. In contrast, tetrathionate oxidation by Sb. thermosulfidooxidans was severely slowed as nitrate concentrations were increased and the lag time before the commencement of tetrathionate oxidation and ferrous ion oxidation also increased markedly. Overall, the results of studies on nitrate toxicity conducted using mesophilic organisms are in agreement with those of the present study using moderately thermophilic bacteria and show that responses differ between genera, between species of the same genera and between strains of the same species, and that differences in lag times and ferrous ion and sulfur or tetrathionate oxidation rates may also be strongly influenced by growth history. Knowledge of microbial behaviour is of practical importance to metallurgists responsible for bioleaching operations where microbial activities are mostly inferred from measurements of physical and chemical parameters in leach solutions.
Sulfobacillus ferrous ion oxidation tetrathionate oxidation potassium nitrate
D.W. Shiers D. E. Ralph H. R. Watling
A. J. Parker Cooperative Research Centre for Integrated Hydrometallurgy Solutions,CSIRO Process Scie A. J. Parker Cooperative Research Centre for Integrated Hydrometallurgy Solutions,CSIRO Process Scie A. J. Parker Cooperative Research Centre for Integrated Hydrometallurgy Solutions,School of Chemical
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
204-210
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）