Palladium and gold removal and recovery from precious metal solutions and electronic scrap leachates by Desulfovibrio desulfuricans

Neil Creamer, VS Baxter-Plant, J Henderson, M Potter, Lynne Macaskie

Research output: Contribution to journalArticle

118 Citations (Scopus)

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 Cu(2+) ( approximately 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 Cu(2+) 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.
Original languageEnglish
Pages (from-to)1475-1484
Number of pages10
JournalBiotechnology Letters
Volume28
DOIs
Publication statusPublished - 1 Sep 2006

Keywords

  • palladium recovery
  • Desulfovibrio desulfuricans
  • gold recovery
  • WEEE scrap

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