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Chemical and microbial leaching of valuable metals from PCBs and tantalum capacitors of spent mobile phones
Citation Link: https://doi.org/10.15480/882.4567
Publikationstyp
Journal Article
Date Issued
2022-08-13
Sprache
English
TORE-DOI
Volume
19
Issue
16
Article Number
10006
Citation
International Journal of Environmental Research and Public Health 19 (16): 10006 (2022)
Publisher DOI
Scopus ID
Publisher
Multidisciplinary Digital Publishing Institute
We compared chemical and microbial leaching for multi-metal extraction from printed circuit boards (PCBs) and tantalum capacitor scrap. A mixed consortium of acidophiles and heterotrophic fungal strains were used in the experiments and compared to chemical leaching using specific acids (sulfuric, citric and oxalic acids). Under optimum conditions, 100% extraction efficiency of Cu, and nearly 85% of Zn, Fe, Al and Ni were achieved from PCB and tantalum capacitor scrap samples using sulfuric acid. The mixed consortium of acidophiles successfully mobilized, Ni and Cu (99% and 96%, respectively) while Fe, Zn, Al and Mn reached an extraction yield of 89, 77, 70 and 43%, respectively, from the PCB samples. For the tantalum capacitor samples, acidophiles mobilized 92% Cu, 88% Ni, 78% Fe, 77% Al, 70% Zn and 57% Mn. Metal mobilization from PCBs and tantalum capacitor scrap by A. niger filtrate showed efficient solubilization of Cu, Fe, Al, Mn, Ni, Pb and Zn at an efficiency of 52, 29, 75, 5, 61, 21 and 35% from PCB samples and 61, 25, 69, 23, 68, 15 and 45% from tantalum capacitor samples, respectively. Microbial leaching proved viable as a method to extract base metals but was less specific for tantalum and precious metals in electronic waste. The implications of these results for further processing of waste electronic and electrical equipment (WEEE) are considered in potential hybrid treatment strategies.
Subjects
bioleaching
tantalum
WEEE
acidophiles
waste management
green technology
DDC Class
540: Chemie
570: Biowissenschaften, Biologie
600: Technik
620: Ingenieurwissenschaften
Publication version
publishedVersion
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ijerph-19-10006.pdf
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