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Effects of forced aeration on community dynamics of free and attached bacteria in copper sulphide ore bioleaching.

Authors :
Chen, Wei
Yin, Shenghua
Ilankoon, I. M. S. K.
Source :
International Journal of Minerals, Metallurgy & Materials; Jan2022, Vol. 29 Issue 1, p59-69, 11p
Publication Year :
2022

Abstract

Bacterial community dynamics and copper leaching with applied forced aeration were investigated during low-grade copper sulphide bioleaching to obtain better bioleaching efficiency. Results illustrated that appropriate aeration improved bacterial concentrations and leaching efficiencies. The highest bacterial concentration and Cu<superscript>2+</superscript> concentration after 14-d leaching were 7.61 × 10<superscript>7</superscript> cells·mL<superscript>−1</superscript> and 704.9 mg·L<superscript>−1</superscript>, respectively, at aeration duration of 4 h·d<superscript>−1</superscript>. The attached bacteria played a significant role during bioleaching from 1 to 7 d. However, free bacteria dominated the bioleaching processes from 8 to 14 d. This phenomenon was mainly caused by the formation of passivation layer through Fe<superscript>3+</superscript> hydrolysis along with bioleaching, which inhibited the contact between the attached bacteria and ore. Meanwhile, 16S rDNA analysis verified the effect of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans on the bioleaching process. The results demonstrate the importance of free and attached bacteria in bioleaching. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
16744799
Volume :
29
Issue :
1
Database :
Complementary Index
Journal :
International Journal of Minerals, Metallurgy & Materials
Publication Type :
Academic Journal
Accession number :
154706984
Full Text :
https://doi.org/10.1007/s12613-020-2125-x