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首页> 外文期刊>International Journal of Environmental Research and Public Health >The Effect of Oxygen Supply on the Dual Growth Kinetics of Acidithiobacillus thiooxidans under Acidic Conditions for Biogas Desulfurization
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The Effect of Oxygen Supply on the Dual Growth Kinetics of Acidithiobacillus thiooxidans under Acidic Conditions for Biogas Desulfurization

机译：在酸性条件下供氧对沼气脱硫的酸性硫代氧化硫杆菌的双重生长动力学的影响

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摘要

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.
机译：在这项研究中，为了模拟沼气的脱硫过程，针对pH值为2的极端酸性条件下的硫氧化细菌（SOB）菌株-硫代氧化硫硫杆菌，提出了一种结合溶解氧（DO）效应的改良Monod-Gompertz动力学模型。使用从鼓泡塔生物反应器获得的实验数据对动力学模型进行校准和验证。 SOB菌株对H2S降解有效，但在DO浓度小于2.0 mg / L时，H2S去除效率迅速下降。在2％–6％的氧气供应范围内有效地处理了低H2S负载，但是当氧气供应高于6％时，即使氧气供应大于6％，也无法满足10 ppm的H2S准则。气体保留时间短至1分钟，H2S入口浓度为5000 ppm。有氧脱硫中应增加氧气供应量，以符合H2S准则;然而，由于氧气效率的下降，超过最佳氧的过量氧气是无效的。模型估计表明，在给定条件下，进水氧浓度为4.9％时，最大的H2S去除率约为400 ppm /％-O2。具有相互作用的底物的低DO阈值的动力学模型是一种有用的工具，可用于模拟氧气供应对H2S去除的影响并确定最佳氧气浓度。

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