Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effect of Livestock Wastewater Addition on Hydrogen and Organic Acids Production Using Food Waste

음식물쓰레기 이용 혐기 산발효에 의한 수소 및 유기산 생산: 축산폐수 첨가 효과

  • JANG, SUJIN (Division of Renewable Energy Engineering, University of Science and Technology) ;
  • KIM, DONGHOON (Department of Civil Engineering, Inha University) ;
  • LEE, MOKWON (Biomass and Waste Energy Laboratory, Korea Institute of Energy Research) ;
  • NA, JEONGGEOL (Biomass and Waste Energy Laboratory, Korea Institute of Energy Research) ;
  • KIM, MISUN (Division of Renewable Energy Engineering, University of Science and Technology)
  • 장수진 (과학기술연합대학원대학교 재생에너지공학) ;
  • 김동훈 (인하대학교 사회인프라공학과) ;
  • 이모권 (한국에너지기술연구원 바이오자원순환연구실) ;
  • 나정걸 (한국에너지기술연구원 바이오자원순환연구실) ;
  • 김미선 (과학기술연합대학원대학교 재생에너지공학)
  • Received : 2015.05.28
  • Accepted : 2015.06.30
  • Published : 2015.06.30
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Abstract

Organic wastes such as food waste (FW), livestock wastewater (LW), and sewage sludge (SWS) can produce hydrogen ($H_2$) by anaerobic acid fermentation. Expecially, FW which has high carbohydrate content produces $H_2$ and short chain fatty acids by indigenous $H_2$ producing microorganisms without adding inoculum, however $H_2$ production rate (HPR) and yield have to be improved to use a commercially available technology. In this study, LW was mixed to FW in different ratios (on chemical oxygen demand (COD) basis) as an auxiliary substrate. The mixture of FW and LW was pretreated at pH 2 using 6 N HCl for 12 h and then fermented at $37^{\circ}C$ for 28 h. HPR of FW, 254 mL $H_2/L/h$, was increased with the addition of LW, however, mixing ratio of LW to FW was reversely related to HPR, exhibiting HPR of 737, 733, 599, and 389 mL $H_2/L/h$ at the ratio of FW:LW=10:1, 10:2, 10:3, and 10:4 on COD basis, respectively. Maximum HPR and $H_2$ production yield of 737 $H_2/L/h$ and 1.74 mol $H_2/mol$ hexoseadded were obtained respectively at the ratio of FW:LW=10:1. Butyrate was the main organic acid produced and propionate was not detected throughout the experiment.

Keywords

References

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