Abstract
Low-grade ores, tailings, and solid wastes contain small amounts of valuable heavy metals. Improper disposal of these substances results in the waste of resources and contamination of soil or groundwater. Accordingly, the treatment and recycling of low-grade ores, tailings, and solid wastes attracted much attention recently. Bioelectrochemical system, an innovative technology for the removal and recovery of heavy metals, has been further developed and applied in recent years. In the current study, the low-grade chalcopyrite was bioleached with the assistance of microbial fuel cells. Copper extraction along with electricity generation from the low-grade chalcopyrite was achieved in the column bioleaching process assisted by MFCs. Results showed that after 197 days bioleaching of low-grade chalcopyrite, 423.9 mg copper was extracted from 200 g low-grade chalcopyrite and the average coulomb production reached 1.75 C/d. The introduction of MFCs into bioleaching processes promoted the copper extraction efficiency by 2.7 times (3.62% vs. 1.33%), mainly via promoting ferrous oxidation, reducing ORP, and stimulating bacterial growth. This work provides a feasible method for the treatment and recycling of low-grade ores, tailings, and solid wastes. But balancing energy consumption of aeration and circulation frequency and chemical consumption of acid to improve the copper extraction efficiency need further investigation.








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This work was supported by the National Natural Science Foundation of China (Grant No. 21577108).
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Material preparation, data collection, and analysis were performed by XZ and TH. The first draft of the manuscript was written by XZ. ZJ helped review the writing of the draft manuscript. SZ made a critical editing and reviewing of the whole manuscript. All authors read and approved the final manuscript.
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Zhang, X., Zhang, S., Huang, T. et al. Copper extraction from low-grade chalcopyrite in a bioleaching column assisted by bioelectrochemical system. Environ Sci Pollut Res 29, 35459–35470 (2022). https://doi.org/10.1007/s11356-021-18283-8
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DOI: https://doi.org/10.1007/s11356-021-18283-8
