Abstract
The present study performed a continuous mode of bioleaching to investigate the leaching efficiency of Titanium (Ti) from bauxite residue using Penicillium Tricolor at between 4% and 12% pulp densities during a 120-day running. Obtained results of the current study showed that increased pulp density led to a decrease in biomass, dissolved oxygen, and amount of leaching Ti as well as an increase in pH value. Further, it was found that efficiency of bioleaching can be enhanced by increasing the rate of aeration, retention time, and concentration of carbon source. However, it was also evident that, at high pulp density, excessive agitation did not give an expected leaching efficiency but a collapse of biomass. In addition, results of the present study showed that the maximum leaching amount of Ti was 3202 mg/L with a corresponding leaching ratio of 50.35% during the whole bioleaching process. Moreover, it was noted that the biomass showed a significant negative correlation with the pH value and dissolved oxygen. However, the biomass showed a significant positive correlation with leaching amount of Ti and thus indicate that microbial metabolic activities are the uppermost factor affecting the continuous leaching performance.
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Acknowledgements
This work was jointly supported by the National Natural Science Foundation of China (51804155, 41701306), Henan Key project of Science and Technology (212102310373, 212102310526), Henan Higher Education Training Program for Young Core Teachers (2021GGJS166), Guizhou Outstanding Young Scientific and Technological Talents Project (2021-5641), and Undergraduate Innovation and Entrepreneurship Competition (S202111070015).
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Qu, Y., Li, H., Shi, B. et al. Bioleaching Performance of Titanium from Bauxite Residue Under a Continuous Mode Using Penicillium Tricolor. Bull Environ Contam Toxicol 109, 61–67 (2022). https://doi.org/10.1007/s00128-022-03518-2
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DOI: https://doi.org/10.1007/s00128-022-03518-2