Journal
WASTE MANAGEMENT
Volume 41, Issue -, Pages 148-158Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2015.04.001
Keywords
Bioleaching; Copper; PCB; Sulfobacillus thermosulfidooxidans; Rotating-drum reactor
Categories
Funding
- CAPES-Brazil
- WBI-Belgium
- CNPq
- FAPEMIG
- FINEP
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The current work reports on a new approach for copper bioleaching from Printed Circuit Board (PCB) by moderate thermophiles in a rotating-drum reactor. Initially leaching of PCB was carried out in shake flasks to assess the effects of particle size (-208 mu m + 147 mu m), ferrous iron concentration (1.25-10.0 g/L) and pH (1.5-2.5) on copper leaching using mesophile and moderate thermophile microorganisms. Only at a relatively low solid content (10.0 g/L) complete copper extraction was achieved from the particle size investigated. Conversely, high copper extractions were possible from coarse-ground PCB (20 mm-long) working with increased solids concentration (up to 25.0 g/L). Because there was as the faster leaching kinetics at 50 degrees C Sulfobacillus therm osulfidooxidans was selected for experiments in a rotating-drum reactor with the coarser-sized PCB sheets. Under optimal conditions, copper extraction reached 85%, in 8 days and microscopic observations by SEM-EDS of the on non-leached and leached material suggested that metal dissolution from the internal layers was restricted by the fact that metal surface was not entirely available and accessible for the solution in the case of the 20 mm-size sheets. (C) 2015 Elsevier Ltd. All rights reserved.
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