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

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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)

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.

Suggested Citation

  • Hyeong-Kyu Namgung & JiHyeon Song, 2015. "The Effect of Oxygen Supply on the Dual Growth Kinetics of Acidithiobacillus thiooxidans under Acidic Conditions for Biogas Desulfurization," IJERPH, MDPI, vol. 12(2), pages 1-19, January.
    • Handle: RePEc:gam:jijerp:v:12:y:2015:i:2:p:1368-1386:d:45147
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    1. Nizami, Abdul-Sattar & Murphy, Jerry D., 2010. "What type of digester configurations should be employed to produce biomethane from grass silage?," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(6), pages 1558-1568, August.
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    1. Jeong-Hee Kang & Hyeong-Gyu Namgung & Jeong-Il Cho & Sung Soo Yoo & Bong-Jae Lee & Hyon Wook Ji, 2020. "Removal of Hydrogen Sulfide in Septic Tanks for Treating Black Water via an Immobilized Media of Sulfur-Oxidizing Bacteria," IJERPH, MDPI, vol. 17(3), pages 1-12, January.

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