Isolation and characterization of an acidophilic, heterotrophic bacterium capable of oxidizing ferrous iron

Article Abstract:

A bacterium, coded as CCH7, was isolated from an acidic stream in a disused pyrite mine. The bacterium was characterized as an acidophilic heterotroph, growing between pH 2.0 and 4.4. It had the capacity to oxidize ferrous iron, although was unable to utilize the energy released in this reaction. Morphologically, the isolate formed long chains and unbranched filaments and possible sheath-like structures. The bacterium was gram negative and did not form endospores. Based on the morphological and physiological evidence, CCH7 may be an acidophilic species of the genus Sphaerotilus.

Bacteria, Heterotrophic, Heterotrophic bacteria, Bacteria, Morphology (Biology)

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Leaching of pyrite by acidophilic heterotrophic iron-oxidizing bacteria in pure and mixed cultures

Article Abstract:

Research was conducted to examine the leaching of pyrite by acidophilic heterotrophic iron-oxidizing bacteria in pure and mixed cultures. Seven strains of the bacteria were analyzed to determine their abilities to promote oxidative dissolution of pyrite with sulfur-oxidizing Thiobacillus spp. Results indicate that the iron-oxidizing bacteria are significant net contributors to mineral oxidation although the requirement of the organisms for organic carbon is minimal.

Oxidizing agents, Leaching, Pyrites

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Enumeration and characterization of acidophilic microorganisms isolated from a pilot plant stirred-tank bioleaching operation

Article Abstract:

Research shows that mixed cultures of iron- and sulfur-oxidizing prokaryotic acidophiles mediate dissolution of sulfide minerals in industrial stirred-tank bioleaching operations as represented by a thermophilic Leptospirillum isolate and an archaeon. Furthermore, the microbial populations change with the degree of mineral dissolution.

United Kingdom, South Africa, Analysis, Physiological aspects, Environmental aspects, Biodegradation, Chemical plants, Industrial microorganisms, Chemical properties, Sulfide minerals

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