期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 272, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.118701
关键词
E-waste; Bubble column bioreactor; Acidithiobacillus ferrooxidans; Basis metal recovery; Optimization
资金
- Tarbiat Modares University [IG39701]
- Sharif University of Technology [QA:970713]
This study successfully investigated the bioleaching of important base metals (Cu, Ni, and Fe) from spent printed circuit boards (PCBs) using adapted Acidithiobacillus ferrooxidans in bubble column bioreactors, achieving simultaneous recovery of copper, nickel, and iron.
The high amount of base metals poses an important challenge in gold bioleaching from spent printed circuit boards (PCBs). This study aims to investigate the bioleaching of important base metals (Cu, Ni, and Fe) from a mixture of spent PCBs (E-waste) using adapted Acidithiobacillus ferrooxidans in the bubble column bioreactors. Firstly, the adaptation process is done from 1 to 15 g/L in Erlenmeyer flasks in 187 days, then the concentration of E-waste increased to 40 g/L in bubble column bioreactors in 44 days. The concurrent recovery of copper, nickel, and iron using adapted bacterium in a bioreactor was optimized by central composite design. Various effective parameters such as aeration rate, initial ferrous sulfate concentration, and solid waste loading that significantly affected bioleaching yields were studied. 54% of Cu (6% dissolution/d), 75% of Ni (8% dissolution/ d), and 55% of Fe (6.1% dissolution/d) were simultaneously recovered under the optimum condition of 20 g/L of solid content, 1.5 vvm of aeration rate, and 40 g/L of the initial concentration of ferrous sulfate after only 9 days. The results proved 100% recovery of each metal is separately possible; 100% of Cu and Fe are extracted maximally on the 4th and 13th day, respectively. Ni is recovered maximally 96% on the 17th day. This is the first report of an ecofriendly method for the bioleaching of important base metals from E-waste in a bubble column bioreactor. Thus, the obtained results contribute to the knowledge of microbial hydrometallurgy on a large scale.
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