The Effect of Oxygen Supply on the Dual Growth Kinetics of Acidithiobacillus thiooxidans under Acidic Conditions for Biogas Desulfurization

Hyeong-Kyu Namgung and JiHyeon Song
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Hyeong-Kyu Namgung: Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-Dong, Seoul 143-747, Korea
JiHyeon Song: Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-Dong, Seoul 143-747, Korea

IJERPH, 2015, vol. 12, issue 2, 1-19

Abstract: 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 2 S degradation, but the H 2 S removal efficiency dropped rapidly at DO concentrations less than 2.0 mg/L. A low H 2 S loading was effectively treated with oxygen supplied in a range of 2%–6%, but a H 2 S guideline of 10 ppm could not be met, even with an oxygen supply greater than 6%, when the H 2 S loading was high at a short gas retention time of 1 min and a H 2 S inlet concentration of 5000 ppm. The oxygen supply should be increased in the aerobic desulfurization to meet the H 2 S 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 2 S 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 2 S removal and to determine the optimal oxygen concentration.

Keywords: biogas desulfurization; sulfur oxidizing bacteria; Acidithiobacillus thiooxidans; acidic condition; dual growth kinetic; model simulation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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