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In situ Removal of Hydrogen Sulfide During Biogas Fermentation at Microaerobic Condition

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Abstract

In this paper, rice straw was used as a raw material to produce biogas by anaerobic batch fermentation at 35 °C (mesophilic) or 55 °C (thermophilic). The hydrogen sulfide in biogas can be converted to S0 or sulfate and removed in-situ under micro-oxygen environment. Trace oxygen was conducted to the anaerobic fermentation tank in amount of 0.5, 1.0, 2.0, 3.0, 4.0, 5.0, or 10.0 times stoichiometric equivalence, respectively, and the control experiment without oxygen addition was carried out. The results showed that the initial H2S concentrations of biogas are about 3235 ± 185 mg/m3 (mesophilic) or 3394 ± 126 mg/m3 (thermophilic), respectively. The desulfurization efficiency is 72.3 % (mesophilic) or 65.6 % (thermophilic), respectively, with oxygen addition by stoichiometric relation. When the oxygen feeded in amount of 2∼4 times, theoretical quantity demanded the removal efficiency of hydrogen sulfide could be over 92 %, and the oxygen residue in biogas could be maintained less than 0.5 %, which fit the requirement of biogas used as vehicle fuel or combined to the grid. Though further more oxygen addition could promote the removal efficiency of hydrogen sulfide (about 93.6 %), the oxygen residue in biogas would be higher than the application limit concentration (0.5 %). Whether mesophilic or thermophilic fermentation with the extra addition of oxygen, there were no obvious changes in the gas production and methane concentration. In conclusion, in-situ desulfurization can be achieved in the anaerobic methane fermentation system under micro-oxygen environment. In addition, air could be used as a substitute oxygen resource on the situation without strict demand for the methane content of biogas.

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Authors and Affiliations

  1. College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, 310014, People’s Republic of China

    Mengmeng Wu, Yima Zhang, Yuanyuan Ye & Chunmian Lin

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  1. Mengmeng Wu
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  2. Yima Zhang
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  3. Yuanyuan Ye
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  4. Chunmian Lin
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Correspondence to Chunmian Lin.

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Wu, M., Zhang, Y., Ye, Y. et al. In situ Removal of Hydrogen Sulfide During Biogas Fermentation at Microaerobic Condition. Appl Biochem Biotechnol 180, 817–825 (2016). https://doi.org/10.1007/s12010-016-2135-3

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  • DOI: https://doi.org/10.1007/s12010-016-2135-3

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