|تعداد مشاهده مقاله||106,227,451|
|تعداد دریافت فایل اصل مقاله||83,129,605|
Bioleaching and Kinetic Investigation of WPCBs by A. Ferrooxidans, A. Thiooxidans and their Mixtures
|Journal of Chemical and Petroleum Engineering|
|مقاله 8، دوره 52، شماره 1، شهریور 2018، صفحه 81-91 اصل مقاله (878.7 K)|
|نوع مقاله: Research Paper|
|شناسه دیجیتال (DOI): 10.22059/jchpe.2018.255842.1227|
|Melika Mostafavi1؛ S. M. J. Mirazimi2؛ Fereshteh Rashchi3؛ F. Faraji3؛ Navid Mostoufi* 4|
|1School of Chemical Engineering, University of Tehran, Kish International Campus, Kish Island, Iran|
|2Department of Materials Engineering, University of British Columbia, 6350 Stores Road, Vancouver, BC, Canada, V6T 1Z4|
|3School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran, P.O. Box 11155/4563|
|4School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran, P.O. Box 11155/4563|
|Bioleaching was used to mobilize Cu, Zn and Ni from waste printed circuit boards (WPCBs) and eliminate hazardous metal species from these wastes. Pulp density (PD) and medium culture are two effective factors which have been optimized in this paper. The bacteria Acidithiobacillus ferrooxidans (A. ferrooxidans) and Acidithiobacillus thiooxidans (A. thiooxidans) and their mixture were grown and adapted in the presence of WPCBs and then used as bioleaching bacteria to solubilize metals from PCBs. The experimental results demonstrated that 15 g/L WPCB is the best solid concentration which can be tolerated by the bacteria. Comparing different inoculation ratios, Cu (86%), Zn (100%) and Ni (100%) were recovered after 25 days of bioleaching, which suggests that the rate of metal recovery is significantly influenced by PD. Kinetics of bioleaching reactions was investigated in this work and the shrinking core model (SCM) was used to describe the kinetics of the process of no pretreated WPCBs. A constrained multi-linear regression analysis using the least square technique was employed to determine the rate controlling mechanism in each operating condition. Based on the results, diffusion through solid product layer was the major controlling mechanism.|
|Bioleaching؛ Copper؛ Electronic scrap؛ kinetics؛ nickel؛ Zinc|
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