Isolation of an extremely acidophilic and highly efficient strain Acidithiobacillus sp. for chalcopyrite bioleaching

• Published in: Journal of industrial microbiology & biotechnology Vol. 39; no. 11; pp. 1625 - 1635
• Main Authors: Feng, Shoushuai, Yang, Hailin, Xin, Yu, Zhang, Ling, Kang, Wenliang, Wang, Wu
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.11.2012; Springer; Springer Nature B.V
• Subjects: Acidithiobacillus - genetics; Acidithiobacillus - isolation & purification; Acidithiobacillus - metabolism; Antibiotics; Bacteria; Biochemistry; Biohydrometallurgy. Microbial leaching; Bioinformatics; Biological and medical sciences; Biomedical and Life Sciences; Biotechnology; China; Copper; Copper - metabolism; Energy sources; Environmental Microbiology; Ferric Compounds - metabolism; Fundamental and applied biological sciences. Psychology; Genetic Engineering; Hydrogen-Ion Concentration; Industrial applications and implications. Economical aspects; Inorganic Chemistry; Interdisciplinary subjects; Leaching; Life Sciences; Microbiology; Microscopy; Mining; Phylogenetics; Phylogeny; Physiology; RNA, Ribosomal, 16S - genetics; Studies; Sulfates - metabolism; Sulfur; Temperature; China; Highly efficient bioleaching; Chalcopyrite; Extremophile; Jarosite; Acidophily; Isolation; Bacterial leaching; Acidithiobacillus
• ISSN: 1367-5435; 1476-5535
• DOI: 10.1007/s10295-012-1174-1

An extremely acidophilic sulfur-oxidizing bacterium was isolated from an industrial-scale bioheap of the Zijinshan copper mine and was named ZJJN. A tuft of flagella and a layer of thick capsule outside the cell envelope were clearly observed under transmission electron microscopy (TEM), which might be closely related to the extremely acid-proof capacity of ZJJN cells in the bioleaching system; 16S ribosomal RNA (rRNA) phylogeny showed that the isolated strain was highly homologous to the genera of Acidithiobacillus . The optimum temperature of ZJJN was determined at 30 °C and pH at 1.0. It was capable of growth at even pH 0. Strain ZJJN can utilize reduced sulfur as an energy source but not with organics or ferrous ion. Strain ZJJN was sensitive to all antibiotics with different concentrations; when it showed a certain resistance to different concentrations of Cu 2+ . In the mixed strains of ZJJN and A. ferrooxidans system (initial pH 1.0), the copper-leaching efficiency was up to 60.1 %, which was far higher than other systems. Scanning electron microscopy (SEM) analysis showed that less jarosite precipitation was produced in the most efficient system. The extremely acidophilic strain ZJJN would be of great potential in the application of chalcopyrite bioleaching.