Acid mine drainage at the Bahia Gold Belt (Brazil): microbial isolation and characterization

被引：5

作者：

Bernardez, Leticia A. ^{[1
]}

de Oliveira, Luis Eduardo L. ^{[1
]}

de Andrade Lima, Luiz Rogerio P. ^{[1
]}

机构：

[1] Univ Fed Bahia, Dept Mat Sci & Technol, Rua Aristides Novis 2, BR-40210630 Salvador, BA, Brazil

来源：

ENVIRONMENTAL MONITORING AND ASSESSMENT | 2021年 / 193卷 / 02期

关键词：

Acid mine drainage; Gold mine; Tailings dam; pyrite;

D O I：

10.1007/s10661-021-08844-2

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Acid mine drainage occurs due to the chemical and microbiological oxidation of sulfide minerals and can be a source of potentially toxic elements contamination of groundwater and surface water. The objective of this study was to identify microorganisms involved in sulfide oxidation in the tailings of a Bahia Gold Belt mine (Brazil). Samples of solids and water were collected at the mine tailings dam and characterized. The microorganisms were isolated after enrichment and subsequent purification. The major constituents of the tailings are Si, Fe, Al, S, and K. The sulfur content of the tailings is 0.98%. The major phases are quartz, muscovite, and clinochlore. Gravity concentrates of the tailings show several particles of pyrite, that is, the major sulfide phase. Molecular analysis identified the microorganisms isolated in the acid mine drainage process in this region. Five bacterium species were found: Acidithiobacillus spp., Acidithiobacillus ferrooxidans, Acidiphilium spp., Leptospirillum type II, and Sulfobacillus spp. No organisms of the archaea or eukaryote domains were found. The isolate was used in the bioleaching of copper sulfide ore, and the copper extraction was about 60% in 60 days for ground ore.

引用

页数：11

共 28 条

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