Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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A Feasibility Study for Renewable Energy from Sewage Sludge Biogas

하수슬러지 Biogas의 신재생에너지화 타당성 연구

  • Kang, Ho (Department of Environmental Engineering, Chungnam National University) ;
  • Lee, Hye Mi (Department of Environmental Engineering, Chungnam National University) ;
  • Cho, Sang Sun (Department of Environmental Engineering, Chungnam National University) ;
  • Park, Sun Uk (Department of Environmental Engineering, Chungnam National University) ;
  • Jeong, Ji Hyun (Department of Environmental Engineering, Chungnam National University)
  • 강호 (충남대학교 환경공학과) ;
  • 이혜미 (충남대학교 환경공학과) ;
  • 조상선 (충남대학교 환경공학과) ;
  • 박선욱 (충남대학교 환경공학과) ;
  • 정지현 (충남대학교 환경공학과)
  • Received : 2010.02.10
  • Accepted : 2010.07.30
  • Published : 2010.09.30
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Abstract

This study was carried out not only to evaluate optimal operating condition to increase biogas production, but also to estimate feasibility of renewable energy from anaerobic digester of sewage sludge. Semi- continuous Fed and Mixed Reactors (SCFMRs) were operated in various condition to quantify the reactor variables. The result of SCFMR operation showed that the biogas productivity and total volatile solids (TVS) removal of total solids (TS) 4% reactor at hydraulic retention time (HRT) 20 days with Organic Loading Rate (OLR) of $1.45kg/m^3-d$ were $0.39m^3/m^3-d$ and 26.7%, respectively which was two times higher than that of TS 2.5% reactor. Consequently the daily biogas production of $20,000m^3$ would be possible from the total volume of $52,000m^3$ of anaerobic digesters of the municipal wastewater treatment plant in D city. In feasibility study for the Biogas utilization, combined heat and power system (CHP) and CNG gasification were examined. In case of CHP, the withdrawal period of capital cost for gas-engine (GE) and micro gas-turbine (MGT) were 7.7 years and 9.1 years respectively. biogas utilization as Clean Natural Gas (CNG) shows lower capital cost and higher profit than that of CHP system. CNG gasificaion after biogas purification is likely the best alternative for Biogas utilization which have more economic potential than CHP system. The withdrawal period of capital cost appeared to be 2.3 years.

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References

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