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Effect of S/N Ratio on the Removal of Hydrogen Sulfide from Biogas in Anoxic Bioreactors

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Abstract

Both biogas desulfurization and wastewater denitrification can be achieved simultaneously, when nitrate/nitrite is used as the electron acceptor for H2S oxidation. The main objective of this study was to investigate the influence of the molar ratio of sulfide/nitrate (S/N) on biogas desulfurization performance in a biotrickling filter (BTF) and a biobubble column (BBC). The results show that with the decrease of the S/N ratios from 3.6 to 0.7, the removal efficiencies of H2S increased from about 66 to 100 %, while the removal of nitrate decreased from 100 to 70 % in the two bioreactors. The BTF has a better and more stable desulfurization performance than the BBC does, which could be attributed to their different gas-liquid contacting modes. With the increase of the S/N ratios from 1.0 to 2.5 in the BTFs, the removal of H2S in biogas was affected slightly, while the percentages of the produced sulfate decreased evidently. In addition, different supplying methods of nitrate wastewater, i.e., intermittent and continuous, did not affect the removal of H2S significantly, while the intermittent addition of nitrate wastewater increased the percentages of sulfate and denitrification performance.

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Acknowledgments

This work was supported by the National Nature Science Foundation of China (No. 51208324), the Ministry of Education of China (New Century Distinguished Young Scientist Supporting Plan, No. NCET-13-0387), and Excellent Young Scholar Foundation of Sichuan University (2013).

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Authors and Affiliations

  1. College of Architecture and Environment, Sichuan University, Chengdu, 610065, People’s Republic of China

    Xi Li, Xia Jiang, Qiying Zhou & Wenju Jiang

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  1. Xi Li
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  2. Xia Jiang
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Correspondence to Xia Jiang.

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Li, X., Jiang, X., Zhou, Q. et al. Effect of S/N Ratio on the Removal of Hydrogen Sulfide from Biogas in Anoxic Bioreactors. Appl Biochem Biotechnol 180, 930–944 (2016). https://doi.org/10.1007/s12010-016-2143-3

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