Leaching of zinc sulfide by Thiobacillus ferrooxidans: experiments with a controlled redox potential indicate no direct bacterial mechanism
Article Abstract:
A study on the mechanism of bacterial leaching of zinc sulfide was conducted to examine the mechanism of dissolution of sulfide ores in the presence of Thiobacillus ferroxidans. Analysis of the conversion of zinc sulfide in the absence of the bacteria and analysis of the conversion of zinc sulfate in the presence of the bacteria produced the same results. This suggested that the only role of the bacteria under the conditions used is regeneration of ferric ions in solutions. No evidence was found that there is a direct mechanism for bacterial leaching.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1998
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Anaerobic benzene biodegradation linked to nitrate reduction
Article Abstract:
Research was conducted to examine the link between nitrate reduction and benzene biodegradation in enrichment and transfer cultures obtained from the original nitrate-amended microcosms. Nitrate reduction and benzene biodegradation took place concurrently at a constant ratio of 10 mol of nitrate consumed per mol of benzene degraded. Results indicate that benzene degradation is coupled more tightly to nitrate reduction to nitrite than to nitrite reduction to nitrogen gas.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1999
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Bacterial oxidation of sulfide minerals in column leaching experiments at suboptimal temperatures
Article Abstract:
Column bioleaching at temperatures in the range of 4 to 37 degrees Centigrade was done in an experimental study to know the rate of reaction of sulfide bacterial oxidation. Sulfide minerals studied were chalcopyrite, sphalerite, pyrrhotite, pentlandite and pyrite. Leaching progresswas indicated by acid consumption and changes in pH and redox potential values.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992
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