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Microorganisms
Volume 8
Issue 11
10.3390/microorganisms8111783
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Article

Bioleaching of Gold from Sulfidic Gold Ore Concentrate and Electronic Waste by Roseovarius tolerans and Roseovarius mucosus

by
Kanjana Kudpeng
1,2,
Tsing Bohu
3,
Christina Morris
1,
Paitip Thiravetyan
2 and
Anna H. Kaksonen
1,4,*
1
Commonwealth Scientific and Industrial Research Organisation (CSIRO) Land and Water, 147 Underwood Avenue, Floreat, WA 6014, Australia
2
School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkok 10150, Thailand
3
CSIRO Mineral Resources, Australian Resources and Research Centre, Kensington, WA 6151, Australia
4
School of Biomedical Sciences, University of Western Australia, Crawley, WA 6009, Australia
*
Author to whom correspondence should be addressed.
Microorganisms 2020, 8(11), 1783; https://doi.org/10.3390/microorganisms8111783
Submission received: 28 October 2020 / Revised: 10 November 2020 / Accepted: 12 November 2020 / Published: 14 November 2020
(This article belongs to the Section Microbial Biotechnology)
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Abstract

Gold bioleaching mediated by iodide oxidizing bacteria (IOB) has been proposed as a sustainable alternative to conventional technologies such as cyanidation. This study evaluated the ability of two IOB sourced from a commercial culture collection, Roseovarius (R.) tolerans DSM 11457T and R. mucosus DSM 17069T, to bioleach gold from electronic waste (e-waste) (1030 ppm gold) and sulfidic gold ore concentrate (45 ppm gold) using one-step, two-step and spent medium leaching at 1% pulp density over 10 days. Two-step bioleaching of ore concentrate resulted in the highest gold leaching yields (approximately ~100% and 34% for R. tolerans and R. mucosus, respectively), followed by spent medium leaching and one-step leaching. The yields remained low for e-waste with both strains (maximum 0.93% and 1.6% for R. tolerans and R. mucosus, respectively) and decreased over time, likely due to the instability of the solubilized gold at relatively low redox potentials (<300 mV vs. Ag/AgCl). Another limiting factor may be the partial inhibition of bacterial growth in the presence of the ore concentrate and e-waste. Therefore, future studies should evaluate the pre-treatment of the ore concentrate and e-waste to remove inhibitory and oxidant consuming compounds before bioleaching with IOB to optimize leaching yields.
Keywords: bioleaching; concentrate; electronic waste; gold; iodide oxidising bacteria; printed circuit board; Roseovarius mucosus; Roseovarius tolerans; sulfidic ore concentrate bioleaching; concentrate; electronic waste; gold; iodide oxidising bacteria; printed circuit board; Roseovarius mucosus; Roseovarius tolerans; sulfidic ore concentrate

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MDPI and ACS Style

Kudpeng, K.; Bohu, T.; Morris, C.; Thiravetyan, P.; Kaksonen, A.H. Bioleaching of Gold from Sulfidic Gold Ore Concentrate and Electronic Waste by Roseovarius tolerans and Roseovarius mucosus. Microorganisms 2020, 8, 1783. https://doi.org/10.3390/microorganisms8111783

AMA Style

Kudpeng K, Bohu T, Morris C, Thiravetyan P, Kaksonen AH. Bioleaching of Gold from Sulfidic Gold Ore Concentrate and Electronic Waste by Roseovarius tolerans and Roseovarius mucosus. Microorganisms. 2020; 8(11):1783. https://doi.org/10.3390/microorganisms8111783

Chicago/Turabian Style

Kudpeng, Kanjana, Tsing Bohu, Christina Morris, Paitip Thiravetyan, and Anna H. Kaksonen. 2020. "Bioleaching of Gold from Sulfidic Gold Ore Concentrate and Electronic Waste by Roseovarius tolerans and Roseovarius mucosus" Microorganisms 8, no. 11: 1783. https://doi.org/10.3390/microorganisms8111783

APA Style

Kudpeng, K., Bohu, T., Morris, C., Thiravetyan, P., & Kaksonen, A. H. (2020). Bioleaching of Gold from Sulfidic Gold Ore Concentrate and Electronic Waste by Roseovarius tolerans and Roseovarius mucosus. Microorganisms, 8(11), 1783. https://doi.org/10.3390/microorganisms8111783

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