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A Novel Acidimicrobium Species in Continuous Cultures of Moderately Thermophilic, Mineral-Sulfide-Oxidizing Acidophiles

Author:
Cleaver, Adam A., Burton, Nicolas P., Norris, Paul R.
Source:
Applied and environmental microbiology 2007 v.73 no.13 pp. 4294-4299
ISSN:
0099-2240
Subject:
Acidimicrobium ferrooxidans, Acidithiobacillus caldus, Sulfobacillus thermosulfidooxidans, air, carbon dioxide, iron, mixed culture, nickel, oxidation
Abstract:
A novel species of Acidimicrobium appeared to be the predominant ferrous iron oxidizer in a mixed culture that effected the continuous, efficient extraction of nickel from a mineral concentrate at 49°C, but it was not isolated in pure culture. It outcompeted Acidimicrobium ferrooxidans, which was expected to have a major role in iron oxidation in reactors gassed with air, and was outnumbered at 49°C only by the sulfur-oxidizing Acidithiobacillus caldus. Sulfobacillus species were expected to compete with Acidimicrobium species when culture aeration was enriched with carbon dioxide, but they were a minor component of the populations with and without this enrichment. Sulfobacillus thermosulfidooxidans replaced the Acidimicrobium species and Acidithiobacillus caldus when the temperature was increased to 55°C.
Agid:
538441