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Kinetic model of CuS oxidation by Thiobacillus ferrooxidans and Thiobacillus thiooxidans bacteria

100%

Nowaczyk K., Domka F.

Polish Journal of Environmental Studies

2000

tom 09

nr 3

Kinetics of the process of microbiological oxidation of synthetic CuS performed with the involvement of pure and mixed cultures of T. ferrooxidans and T. lluooxidans bacteria were studied. The CuS oxidation with T. ferrooxidans bacteria was found to be best described by the model of inhibition of the first order with respect to the substrate and the product-inhibitor, while the process with T. thiooxidans and mixed cultures of these bacteria is best described by the first order reaction with respect to the substrate. It was also shown that the adaptation of the bacteria to the CuS tested significantly shortens the induction period and increases reaction rates. The optimum conditions of CuS oxidation were established. The yield of the reaction was established as ca. 30% and an increase in the reaction rate was observed when using mixed cultures of T. feirooxidans i T. thiooxidans bacteria adapted to CuS at 35ºC, in the medium containing 1 % (wt./vol.) CuS at the initial pH of the medium of 1.82.

Bacterial oxidation of thiosulphate

67%

Cwalina B., Dzierzewicz Z., Bulas L., Farbiszewska T.

Acta Biologica Cracoviensia. Series Botanica

1995

tom 37

The course of thiosulphate oxidation by selected strains of autotrophic bacteria Thiobacillus thiooxidans and Thiobacillus ferrooxidans as well as mixotrophic bacteria Sulfobacillus sp. and Siderocapsa sp. was analysed. Hexathionate and trithionate were found to be main intermediate compounds in iron-free solutions containing T. ferrooxidans, Sulfobacillus sp. or Siderocapsa sp., whereas tetrathionate was found in systems with T. thiooxidans. Tetrathionates were commonly present in iron-containing solutions inoculated with all tested strains. Chemical and biochemical processes, occurring within tested solutions, are discussed. Ferrous ion concentration > 0.02 g/dm3 was found to have inhibiting effect on the rate of biotic oxidation of thiosulphate.

Ograniczanie wyników

1 Acta Biologica Cracoviensia. Series Botanica

1 Polish Journal of Environmental Studies

1 Bulas L.

1 Cwalina B.

1 Domka F.

1 Dzierzewicz Z.

1 Farbiszewska T.

1 Nowaczyk K.

1 2000

1 1995

Wyniki wyszukiwania

Kinetic model of CuS oxidation by Thiobacillus ferrooxidans and Thiobacillus thiooxidans bacteria

Bacterial oxidation of thiosulphate