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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 5    May 2020

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Bioleaching of low-grade copper sulfide ore by extremely thermoacidophilic consortia at 70 °C in column reactors
AI Chen-bing(艾郴兵)1, 2, 3, LIANG Yu-ting(梁昱婷)2, 4, QIU Guan-zhou(邱冠周)2, 4, ZENG Wei-min(曾伟民)2, 4

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
3. Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution, Central South University, Changsha 410083, China;
4. Key Laboratory of Biohydrometallurgy of Ministry of Education, Central South University,
Changsha 410083, China

Abstract:The effects of introducing M. sedula derivatives having different Cu2+-resistance on bioleaching capacity of a defined consortium (consisting of A. brierleyi DSM1651 and M. hakonensis HO1-1) were studied in column reactors at 70 °C. Introducing M. sedula copA mutant, a copper sensitive derivative, only had negligible effects on bioleaching. While introducing M. sedula ARS50-2, a Cu2+ resistant strain, substantially consolidated bioleaching process, with 27.77% more copper recovered after 58 d of bioleaching. Addition of M. sedula ARS50-2 likely enhanced the sulfur oxidation capacity of consortium after the 24th day under the Cu2+ stress. The majority of extreme thermoacidophiles were attached on minerals surface as indicated by quantitative PCR (qPCR) data. Successions of microbial community of extremely thermoacidophilic consortia that attached on surface of minerals were different from those in leachate. M. hakonensis HO1-1 was the dominant species attached on minerals surface in each column reactor throughout bioleaching process. The sessile M. sedula ARS50-2 remained as a major species till the 34th day. A. brierleyi DSM1651 was the most abundant planktonic species in leachate of each column reactor. These results highlight that higher Cu2+-resistance is a beneficial trait for extreme thermoacidophiles to process copper minerals.

 

Key words: extreme thermoacidophile; bioleaching; copper sulfide ore; copper resistance; microbial community

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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