Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Methane Recovery and Performances of Full-scale Two-stage Anaerobic Process Treating Piggery Wastewater

양돈폐수처리시 실규모 이단 혐기성공정의 성능 및 메탄회수

  • Jung, Jin-young (Water Environment and Remediation Research Center, KIST) ;
  • Chung, Yun-chul (Water Environment and Remediation Research Center, KIST) ;
  • Kang, Shin-hyun (Water Environment and Remediation Research Center, KIST) ;
  • Chung, Hyung-sook (Environmental Engineering Department, SAMMI Construction Co., Ltd.)
  • 정진영 (한국과학기술연구원 수질환경 및 복원연구센터) ;
  • 정윤철 (한국과학기술연구원 수질환경 및 복원연구센터) ;
  • 강신현 (한국과학기술연구원 수질환경 및 복원연구센터) ;
  • 정형숙 ((주)삼미건설 환경사업본부)
  • Received : 2005.01.26
  • Accepted : 2005.03.15
  • Published : 2005.05.30
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Abstract

The purpose of this study is to investigate the performances of organic removal and methane recovery by using a full scale two-phase anaerobic system. The full scale two-phase anaerobic process was consists of an acidogenic anaerobic baffled reactor (ABR) and a methanognic upflow anaerobic sludge blanket (UASB) reactor. The volumes of acidogenic and methanogenic reactors were designed to $28.3m^3$ and $75.3m^3$. The two-phase anaerobic system represented 60-82% of COD removal efficiency when the influent COD concentration was in the range of 7,150 to 16,270 mg/L after screening (average concentration is 10,280 mg/L). After steady-state, the effluent COD concentration in the methanogenic reactor showed $2,740{\pm}330 mg/L$ by representing average COD removal efficiency was $71.4{\pm}8.1%$ when the operating temperature was in the range of $19-32^{\circ}C$. The effluent SCOD concentration was in the range of 2,000-3,000 mg/L at the steady state while the volatile fatty acid concentration was not detected in the effluent. Meanwhile, the COD removal efficiency in the acidogenic reactor showed less than 5%. The acidogenic reactor played key roles to reduce a shock-loading when periodic shock loading was applied and to acidify influent organics. Due to the high concentration of alkalinity and high pH in the effluent of the methanogenic reactor, over 80% of methane in the biogas was produced consistently. More than 70% of methane was recovered from theoretical methane production of TCOD removed in this research. The produced gas can be directly used as a heat source to increase the reactor temperature.

Keywords

Acknowledgement

Supported by : 산업자원부

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