Effects of dissolved oxygen on the biooxidation process of refractory gold ores(BIOCHEMICAL ENGINEERING)
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概要
- 論文の詳細を見る
While multiple theories exist regarding the effect of dissolved oxygen (DO) on the biooxidation of minerals, few studies have been performed the cellular or molecular scale (e.g., genetics) and the mechanism remains unclear. In this paper, the effects of DO concentration on the biooxidation process of refractory sulfide gold ores by Acidithiobacillus ferrooxidans were investigated in the experimental stirred tank bioreactors (STRs). The results indicated that higher biooxidation and cell growth rates were correlated with higher DO concentration. The biooxidation process was restricted at 1.2 ppm DO due to oxygen limitation. Furthermore, the effects of DO on cellular and molecular scale were studied for the first time. The results demonstrated that the oxygen uptake rate (OUR), the Fe^<2+> oxidation activity and the rus gene expression of A. ferrooxidans all increased with the DO concentration, which might be responsible for the increase of the biooxidation rates with the DO concentration. This study provides insight into the potential impact of molecular-level mechanisms of DO in the biooxidation process of minerals.
- 2012-11-00
著者
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Tan Wen-song
The State Key Laboratory Of Bioreactor Engineering East China University Of Science And Technology
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Zhu Ming-Long
The State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology
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Sun Li-Xin
The State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology
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Zhang Xu
The State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology
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