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A Bioreactor for the Effective Removal of the Hydrogen Sulfide from Biogas

바이오가스에 포함된 고농도 황화수소의 효율적 제거를 위한 미생물반응기

  • Namgung, Hyeong-Kyu (Department of Civil and Environmental Engineering, Sejong University) ;
  • Yoon, Chang No (Molecular Recognition Research Center, Korea Institute of Science and Technology) ;
  • Song, JiHyeon (Department of Civil and Environmental Engineering, Sejong University)
  • 남궁형규 (세종대학교 건설환경공학과) ;
  • 윤창노 (한국과학기술연구원 분자인식연구센터) ;
  • 송지현 (세종대학교 건설환경공학과)
  • Received : 2013.09.03
  • Accepted : 2013.10.18
  • Published : 2013.12.31

Abstract

A two-stage bioreactor system using sulfur-oxidizing bacteria was studied to abate high strength hydrogen sulfide ($H_2S$) from biogas. The two-stage bioreactor consisted of a $H_2S$ absorption column (0.5 L) and a microbial oxidation column (1 L) in series, and the liquid medium was continuously recirculated through the columns. The objectives of this study were to determine the feasibility of the bioreactor for biogas desulfurization and to investigate the effect of the medium circulation rate on the system performance. An averaged concentration of $H_2S$ introduced to the bioreactor was 530 ppm, corresponding to an overall loading rate of $44.4g/m^3/hr$. During the initial 20 days period at the medium recirculation rate of 8 reactor volumes per hour (12 L/hr), the dissolved oxygen (DO) concentration in the oxidation column was 6 mg/L, while the DO in the absorption column was 0.5 mg/L showing that the oxygen contents of the biogas stream was not altered. Because of the biological oxidation of $H_2S$ in the oxidation column, the sulfate concentration increased from 200 mg/L to 5,600 mg/L in the liquid medium. The removal efficiency of $H_2S$ was greater than 99% in the initial operation period. After the initial period, the medium recirculation rate between the two columns was stepwise changed eight times from 1.0 to 40 vol/hr (1.5~60 L/hr). At the recirculation rate of faster than 4 vol/hr, the $H_2S$ removal efficiencies were found to be high, but the efficiency declined at the lower recirculation rates than the threshold.

Keywords

References

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