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Effect of pH values on the extracellular polysaccharide secreted by Acidithiobacillus ferrooxidans during chalcopyrite bioleaching |
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| Authors: | Run-lan Yu Jing Liu Jian-xi Tan Wei-min Zeng Li-juan Shi Guo-hua Gu Wen-qing Qin Guan-zhou Qiu |
| Institution: | 1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China 2. Key Laboratory of Biometallurgy, Ministry of Education, Changsha, 410083, China 3. Hunan Entry-Exit Inspection and Quarantine Bureau, Changsha, 410004, China |
| Abstract: | The pH value plays an important role in the bioleaching of sulphide minerals. The effect of pH values on the extracellular polysaccharide secreted by Acidithiobacillus ferrooxidans was investigated in different phases of bacterial growth during chalcopyrite bioleaching. It is found that extracellular polysaccharide secretion from the cells attached to chalcopyrite is more efficiently than that of the free cells in the bioleaching solution. Three factors, pH values, the concentration of soluble metal ions, and the bacterial growth and metabolism, affect extracellular polysaccharide secretion in the free cells, and are related to the bacterial growth phase. Extracellular polysaccharide secretion from the attached cells is mainly dependent on the pH value of the bacterial culture. |
| Keywords: | chalcopyrite bioleaching polysaccharides acidity Acidithiobacillusferrooxidans |
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