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Title: Gold bioleaching of electronic waste by cyanogenic bacteria and its enhancement with bio-oxidation
Authors: Pham, V.A.
Ting, Y.P. 
Keywords: Bio-oxidation
Chromobacterium violaceum
Electronic waste
Gold recovery
Pseudomonas fluorescens
Issue Date: 2009
Citation: Pham, V.A., Ting, Y.P. (2009). Gold bioleaching of electronic waste by cyanogenic bacteria and its enhancement with bio-oxidation. Advanced Materials Research 71-73 : 661-664. ScholarBank@NUS Repository.
Abstract: This work compares gold bioleaching from e-waste containing gold and copper by Chromobacterium violaceum and Pseudomonas fluorescens. The effect of pulp density (ranging from 0.5 to 8%w/v) was examined. Although C. violaceum produced more cyanide than P. fluorescens in the absence of e-waste, P. fluorescens showed higher growth rate, cyanide production and gold leaching efficiency at all pulp densities. Pretreatment with biooxidation of the e-waste using Acidithiobacillus ferrooxidans resulted in the removal in excess of 80% of the copper present in the waste, and increased the gold/copper ratio in the residual solid. Bioleaching the biooxidised e-waste significantly improved gold recovery, especially by C. violaceum, particularly at high pulp density. For example, at pulp densities of 2 and 4% w/v, gold recovery from non-biooxidzed e-waste was 0.22 and 0.14% respectively. Higher gold recovery, at 8%, was obtained for bioleaching of the biooxidised e-waste at both these pulp densities. The ratio of gold/copper in leachates after bioleaching of the biooxidized e-waste was also found to be increased. © (2009) Trans Tech Publications.
Source Title: Advanced Materials Research
ISBN: 0878493220
ISSN: 10226680
DOI: 10.4028/
Appears in Collections:Staff Publications

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