Bioleaching of low-grade waste printed circuit boards by mixed fungal culture and its community structure analysis

Xia, M, Bao, P, Liu, A, Wang, M, Shen, L, Yu, R, Liu, Y, Chen, M, Li, J, Wu, X, Qiu, G and Zeng, W 2018, 'Bioleaching of low-grade waste printed circuit boards by mixed fungal culture and its community structure analysis', Resources, Conservation and Recycling, vol. 136, pp. 267-275.


Document type: Journal Article
Collection: Journal Articles

Title Bioleaching of low-grade waste printed circuit boards by mixed fungal culture and its community structure analysis
Author(s) Xia, M
Bao, P
Liu, A
Wang, M
Shen, L
Yu, R
Liu, Y
Chen, M
Li, J
Wu, X
Qiu, G
Zeng, W
Year 2018
Journal name Resources, Conservation and Recycling
Volume number 136
Start page 267
End page 275
Total pages 9
Publisher Elsevier
Abstract Biohydrometallurgy is generally regarded as a green technology for the recycling of electronic waste. The present work was aimed at studying the feasibility of extracting metals from waste printed circuit boards (PCBs) by mixed fungal cultures in the stirred tank reactor. By prior step-wise bioleaching experiments in the flasks, the tolerance of one group of mixed fungal cultures to waste PCBs was brought up to 8% (w/v) pulp density. Thereafter this mixed culture was subjected to further leaching process at the same pulp density in scale-up bioleaching system. The results showed that 56.1 ± 0.69% of Cu, 15.7 ± 0.87% of Al, 20.5 ± 0.78% of Pb, 49.5 ± 0.38% of Zn and 8.1 ± 0.34% of Sn were extracted finally. Furthermore, scanning electron microscopic observation combining with Energy dispersive analysis of x-ray revealed that mycelium could interact with PCBs particles by enwrapping them and adsorbing polymer matrix and metal ions from PCBs. Fourier transform infrared spectroscopy analysis further proved these toxic components destroyed key functional groups of mycelium and then interfered bioleaching efficiency. Community structure analysis revealed that Purpureocillium lilacinum and Aspergillus niger were the two dominated fungal species with abundance of 71.9% and 27.9% at the end of bioleaching process, respectively. © 2018 Elsevier B.V.
Subject Hydrometallurgy
Keyword(s) Community structure
Key functional groups
Mixed fungal cultures
Scale-up bioleaching process
Waste printed circuit boards
DOI - identifier 10.1016/j.resconrec.2018.05.001
Copyright notice © 2018 Elsevier Ltd. All rights reserved
ISSN 0921-3449
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