Growth kinetics of Thiobacillus ferrooxidans in bioelectrochemical cell |
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Authors: | Li Hong-xu Wang Dian-zuo Qiu Guan-zhou and Hu Yue-hua |
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Affiliation: | (1) Department of Mineral Metallurgy and Material, General Research Institute of Nonferrous Metals, 100088 Beijing, China;(2) College of Resources Processing and Bioengineering, Central South University, 410083 Changsha, China |
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Abstract: | Thiobacillus ferrooxidans might be the most important bacteria used in biometallurgy. The foundation way of its growth process is oxidizing ferrous
in order to obtain energy needed for metabolism, but the variation of ferrous concentration and mixed potential of the culture
media would have crucial effect on the bacteria growth. Based on the characteristics of Thiobacillus ferroxidans growth and redox potential of ferric and ferrous, an electrochemical cell was designed conventionally to study growth rule
and the relationship between redox potential and bacteria growth was built up, and some growth kinetics of Thiobacillus ferrooxidans were elucidated. It demonstrates that the variation of open potential of electrochemical cell ΔE shows the growth tendency of Thiobacillus ferrooxidans, at the initial growth stage, the value of δE increases slowly, when at logistic growth stage, it increases drastically, and the growth rate of bacteria is linear with
the oxidation rate of ferrous. The bacteria growth kinetics model is proposed using Monod and Michealis-Menten equation, and
the kinetics parameters are got. The consistence of the measured and the calculated results proves that it is proper to use
the proposed kinetics model and the electrochemical cell method to describe the growth rule of Thiobacillus ferrooxidans.
Foundation item: Project (50204001) supported by the National Science Foundation of China |
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Keywords: | Thiobacillus ferrooxidans electrochemical cell bioleaching kinetics |
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