%0 Journal Article
%T The Effect of Oxygen Supply on the Dual Growth Kinetics of Acidithiobacillus thiooxidans under Acidic Conditions for Biogas Desulfurization
%A Hyeong-Kyu Namgung
%A JiHyeon Song
%J International Journal of Environmental Research and Public Health
%P 1368-1386
%D 2015
%I MDPI AG
%R 10.3390/ijerph120201368
%X In this study, to simulate a biogas desulfurization process, a modified Monod-Gompertz kinetic model incorporating a dissolved oxygen (DO) effect was proposed for a sulfur-oxidizing bacterial (SOB) strain, Acidithiobacillus thiooxidans, under extremely acidic conditions of pH 2. The kinetic model was calibrated and validated using experimental data obtained from a bubble-column bioreactor. The SOB strain was effective for H 2S degradation, but the H 2S removal efficiency dropped rapidly at DO concentrations less than 2.0 mg/L. A low H 2S loading was effectively treated with oxygen supplied in a range of 2%¨C6%, but a H 2S guideline of 10 ppm could not be met, even with an oxygen supply greater than 6%, when the H 2S loading was high at a short gas retention time of 1 min and a H 2S inlet concentration of 5000 ppm. The oxygen supply should be increased in the aerobic desulfurization to meet the H 2S guideline; however, the excess oxygen above the optimum was not effective because of the decline in oxygen efficiency. The model estimation indicated that the maximum H 2S removal rate was approximately 400 ppm/%-O 2 at the influent oxygen concentration of 4.9% under the given condition. The kinetic model with a low DO threshold for the interacting substrates was a useful tool to simulate the effect of the oxygen supply on the H 2S removal and to determine the optimal oxygen concentration.
%K biogas desulfurization
%K sulfur oxidizing bacteria
%K Acidithiobacillus thiooxidans
%K acidic condition
%K dual growth kinetic
%K model simulation
%U http://www.mdpi.com/1660-4601/12/2/1368