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Effects of dissolved oxygen on the biooxidation process of refractory gold ores

Paper ID Volume ID Publish Year Pages File Format Full-Text
20579 43181 2012 6 PDF Available
Title
Effects of dissolved oxygen on the biooxidation process of refractory gold ores
Abstract

While multiple theories exist regarding the effect of dissolved oxygen (DO) on the biooxidation of minerals, few studies have been performed the cellular or molecular scale (e.g., genetics) and the mechanism remains unclear. In this paper, the effects of DO concentration on the biooxidation process of refractory sulfide gold ores by Acidithiobacillus ferrooxidans were investigated in the experimental stirred tank bioreactors (STRs). The results indicated that higher biooxidation and cell growth rates were correlated with higher DO concentration. The biooxidation process was restricted at 1.2 ppm DO due to oxygen limitation. Furthermore, the effects of DO on cellular and molecular scale were studied for the first time. The results demonstrated that the oxygen uptake rate (OUR), the Fe2+ oxidation activity and the rus gene expression of A. ferrooxidans all increased with the DO concentration, which might be responsible for the increase of the biooxidation rates with the DO concentration. This study provides insight into the potential impact of molecular-level mechanisms of DO in the biooxidation process of minerals.

► The biooxidation process by Acidithiobacillus ferrooxidans was restricted at 1.2 ppm DO. ► Both the oxidation rate and the cells grew rate increased with the DO concentration. ► The oxygen uptake rate, the Fe2+ oxidation activity and the expression levels of the rus gene of A. ferrooxidans increased with the DO concentration.

Keywords
Refractory sulfide gold ores; Biooxidation process; Dissolved oxygen; Acidithiobacillus ferrooxidans; Stirred tank bioreactors
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Effects of dissolved oxygen on the biooxidation process of refractory gold ores
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 114, Issue 5, November 2012, Pages 531–536
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us