Due to the disadvantages of physiochemical methods for sulfidic spent caustic treatment,
attentions are drawn to the environmental-friendly biotreatments including sulfur-oxidizing haloalkaliphiles.
Thioalkalivibrio versutus DSM 13738 was grown at alkaline (pH10) autotrophic
medium with sodium carbonate/bicarbonate as the sole source of carbon and amended with sodium
thiosulfate as the electron and energy source. The effect of various parameters including
temperature (25-40 °C), pH (8-11), NaCl concentration (0.5-5 % w/v) and sodium thiosulfate
concentrations (100-750 mM) was evaluated on bacterial growth and thiosulfate removal. This
strain could eliminate sodium thiosulfate at very high concentrations up to 750 mM. The results
showed that the highest specific growth rate was pH 9.5 and thiosulfate removal of Thioalkalivibrio
versutus occurred at pH 10.5. The optimum salt concentration for thiosulfate removal was 2.5 %
w/v and 5 % NaCl and specific growth rate elevated 2.5% w/v. It was also specified that this strain
thrives occurred in 37 ºC and at 35 and 37 ºC higher removal of thiosulfate. Following chemical
oxidation of sulfide to thiosulfate, application of Thioalkalivibrio versutus could be promising for
spent caustic treatment. Since thiosulfate is utilized as an energy source, highest removal efficiency
occurred at marginally different conditions compared to optimal growth.
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