Abstract
Biomass of Desulfovibrio desulfuricans was used to recover Au(III) as Au(0) from test solutions and from waste electronic scrap leachate. Au(0) was precipitated extracellularly by a different mechanism from the biodeposition of Pd(0). The presence of Cu2+ (∼2000 mg/l) in the leachate inhibited the hydrogenase-mediated removal of Pd(II) but pre-palladisation of the cells in the absence of added Cu2+ facilitated removal of Pd(II) from the leachate and more than 95% of the Pd(II) was removed autocatalytically from a test solution supplemented with Cu(II) and Pd(II). Metal recovery was demonstrated in a gas-lift electrobioreactor with electrochemically generated hydrogen, followed by precipitation of recovered metal under gravity. A 3-stage bioseparation process for the recovery of Au(III), Pd(II) and Cu(II) is proposed.
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Acknowledgements
This demonstration study was supported by the UK Department of Trade and Industry (DTI) ‘Biowise’ Programme (Project No. 85840) ‘Novel Bio-electrochemical Technology for the Recovery of Precious Metals from Electronic Scrap’, in conjunction with the Onyx Environmental Trust for the leachate preparation and the demonstration reactor at C-Tech Innovation Ltd. LEM was seconded to C-Tech Innovation, supported by an Industrial Fellowship from the BBSRC and Royal Society. This paper is dedicated to the memory of Dr. ‘Vic’ Baxter-Plant, who died tragically on 18th May 2006.
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Victoria S. Baxter-Plant – Deceased
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Creamer, N.J., Baxter-Plant, V.S., Henderson, J. et al. Palladium and gold removal and recovery from precious metal solutions and electronic scrap leachates by Desulfovibrio desulfuricans . Biotechnol Lett 28, 1475–1484 (2006). https://doi.org/10.1007/s10529-006-9120-9
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DOI: https://doi.org/10.1007/s10529-006-9120-9