title: The effect of oxygen supply on the dual growth kinetics of Acidithiobacillus thiooxidans under acidic conditions for biogas desulfurization.
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 H2S degradation, but the H2S removal efficiency dropped rapidly at DO concentrations less than 2.0 mg/L. A low H2S loading was effectively treated with oxygen supplied in a range of 2%-6%, but a H2S guideline of 10 ppm could not be met, even with an oxygen supply greater than 6%, when the H2S loading was high at a short gas retention time of 1 min and a H2S inlet concentration of 5000 ppm. The oxygen supply should be increased in the aerobic desulfurization to meet the H2S 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 H2S removal rate was approximately 400 ppm/%-O2 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 H2S removal and to determine the optimal oxygen concentration.
authors: Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-Dong, Seoul 143-747, Korea.
authors: Hyeong-Kyu
authors: HK
authors: Namgung
authors: Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-Dong, Seoul 143-747, Korea. songjh@sejong.ac.kr.
authors: JiHyeon
authors: J
authors: Song
mesh_terms: D013856:Acidithiobacillus thiooxidans / Q000187:drug effects* / Q000254:growth & development*; D056804:Biofuels; D019149:Bioreactors; D006862:Hydrogen Sulfide; D007700:Kinetics; D010100:Oxygen / Q000378:metabolism; D013455:Sulfur / Q000378:metabolism*
chemical_list: D056804:Biofuels; D013455:Sulfur; D010100:Oxygen; D006862:Hydrogen Sulfide
references: Environ Sci Technol. 2004 Feb 1;38(3):918-23
references: 14968883
references: J Biosci Bioeng. 2006 Apr;101(4):309-14
references: 16716938
references: Water Res. 2008 Jan;42(1-2):1-12
references: 17692889
references: Chemosphere. 2013 Nov;93(11):2675-82
references: 24041568
references: Water Sci Technol. 2008;57(2):201-7
references: 18235172
references: Bioresour Technol. 2012 Oct;121:419-24
references: 22864178
references: Bioresour Technol. 2013 May;135:283-91
references: 23186660
references: Bioresour Technol. 2013 Nov;147:202-11
references: 23994962
references: Bioresour Technol. 2011 Mar;102(5):4047-53
references: 21216139