Performance evaluation and effect of circulation rate in a bio-desulfurization process aerated by biogas circulation
The biological desulfurization of biogas using a bubble column reactor was investigated in a continuous experiment. Aeration by rapid biogas recirculation between the digester and the biological desulfurization reactor was used to stimulate the gas-liquid mass transfer of H2S. A positive correlation between the biogas circulation rate and H2S removal rate was observed, with 93％ H2S removal efficiency and a 1520 L/L-culture/d recirculation rate at a 500 L/L-culture/d biogas loading rate. Moreover, the increase in the biogas circulation rate stimulated the O2 mass transfer, eventually translating into an increase in sulfate production from the oxidation of H2S. Throughout the continuous experiment, the bubble column reactor retained sufficient levels of sulfide-oxidizing bacteria, including Sulfurimonas denitrificans-velated bacteria and Halothiobacillus neapolitanus-related bacteria. A comparison of the results of the continuous experiment and batch tests suggests that the gasliquid mass transfer rate of H2S was the ratelimiting step in the biological desulfurization using the bubble column process, indicating that the mass transfer efficiency of H2S needs to be improved to enhance the desulfurization performance.
Biological desulfurization Anaerobic digestion Biogas circulation Microbial community
Takuro Kobayashi Kaiqin Xu Yu-You Li Yuhei Inamori
Center for Material Cycles and Waste Management Research, National Institute for Environmental Studi Graduate School of Environmental Studies, Tohoku University, 6-6-06 Aza-Aoba,Aramaki, Aoba-ku, Senda Faculty of Symbiotic Systems Science, Fukushima University, 1 Kanayagawa,Fukushima 960-1248, Japan
国际会议
天津
英文
198-214
2011-11-12（万方平台首次上网日期，不代表论文的发表时间）