Effects of Different Energy Substrates and Nickel and Cadmium Ions on the Growth of Acidithiobacillus ferrooxidans and Its Application for Disposal of Ni-Cd Batteries
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In the present work, the effects of different energy substrates and nickel ions (Ni2+) and cadmium ions (Cd2+) on the growth of Acidithiobacillus ferrooxidans (A. ferrooxidans) were investigated. Ferrous sulphate (FeSO4) was the optimum energy substrate for A. ferrooxidans growth, among the selected substrates. When cultured together with FeSO4 and sulphur (S), A. ferrooxidans first oxidised the ferrous ions (Fe2+), and the S was utilised as the concentration of Fe2+ decreased. After adapting to culture with Ni2+ and Cd2+, A. ferrooxidans presented good tolerance to both ions, with the maximum concentration reaching 4.11 g/L Ni2+ and 1.69 g/L Cd2+. A preliminary simulation of industrial application was also performed on used Ni-Cd batteries. With bioleaching, the highest concentrations of Cd2+ and Ni2+ were 3003 mg/L at day 8 and 1863 mg/L at day 14, respectively.
KeywordsAcidithiobacillus ferrooxidans Energy substrate Ni/Cd ions Bioleaching Ferrous sulphate Battery recycling
This study was funded by the Independent Innovation Project funded by the Ministry of Education-Ecological and Environmental Restoration and Protection (2018ZZCX12).
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflict of interest.
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