Aerobic oxidation of hydrogen sulfide by Thiobacillus denitrificans

It has been demonstrated that Thiobacillus denitrificans may be readily cultured aerobically in batch and continuous flow reactors on H2S(g) under sulfide limiting conditions. Under these conditions sulfide concentrations in the culture medium were less than 1μM resulting in very low concentrations...

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Bibliographic Details
Published in:Biotechnology and bioengineering 1987-04, Vol.29 (6), p.690-695
Main Author: Subletta, Kerry L.
Format: Article
Language:English
Subjects:
aerobic conditions
Bacteriology
Biological and medical sciences
Biology of microorganisms of confirmed or potential industrial interest
bioreactors
Biotechnology
Fundamental and applied biological sciences. Psychology
hydrogen sulfide
Metabolism. Enzymes
Microbiology
Mission oriented research
Physiology and metabolism
Thiobacillus denitrificans
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Summary:It has been demonstrated that Thiobacillus denitrificans may be readily cultured aerobically in batch and continuous flow reactors on H2S(g) under sulfide limiting conditions. Under these conditions sulfide concentrations in the culture medium were less than 1μM resulting in very low concentrations of H2S in the reactor outlet gas. Biomass yield under aerobic conditions was much lower than previously reported for anaerobic conditions, presumably because of oxygen inhibition of growth. However, biomass yield was not affected by steady state oxygen concentration in the range of 45μM–150μM. Biomass yield was also observed to be essentially independent of specific growth rate in the range of 0.030–0.053 h−1. Indicators of reactor upset were determined and recovery from upset conditions demonstrated. Maximum loading of the biomass for H2S oxidation under aerobic conditions was observed to be 15.1–20.9 mmol/h/g biomass which is much higher than previously reported for aerobic conditions. Other aspects of the stoichiometry of aerobic H2S oxidation are also reported.
ISSN:0006-3592
1097-0290
DOI:10.1002/bit.260290605