Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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COD Fraction in Semi-Continuous Food Waste Acid Fermenter

반연속식 음식물쓰레기 산발효조에서 COD 분율

  • Lee, Jae Woo (Department of Environmental Engineering, Korea University) ;
  • Park, Ki Young (Department of Civil and Environmental System Engineering, Konkuk University) ;
  • Kim, Hee Jun (Department of Civil, Urban and Geosystem Engineering, Seoul National University) ;
  • Chung, Tai Hak (Department of Civil, Urban and Geosystem Engineering, Seoul National University)
  • 이재우 (고려대학교 환경시스템공학과) ;
  • 박기영 (건국대학교 사회환경시스템공학과) ;
  • 김희준 (서울대학교 건설환경공학부) ;
  • 정태학 (서울대학교 건설환경공학부)
  • Received : 2007.11.01
  • Accepted : 2007.11.13
  • Published : 2007.11.30
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Abstract

In this study, degradation of carbohydrates and composition of fermentative products were investigated in semi-continuous acid fermenter varying hydraulic retention time (HRT). Rice soup was used as a sole substrate for the acid fermentation. Solubilization efficiency of the substrate was higher than 70% for all HRT, however the gas conversion was ignorable implying that most of organic contents in the influent remained in the form of volatile fatty acids (VFAs) and ethanol after acid fermentation. The VFAs were the predominant product and the VFAs conversion increased as the HRT decreased. The VFAs conversion reached the maximum value at 12 hr HRT accounting for 70% of the influent COD. Similar to VFAs, ethanol conversion was increased with the decrease of HRT and the maximum ethanol conversion efficiency was 8% at the HRT of 12 hr. Composition of VFAs was markedly dependent on HRT. As HRT increased, the composition of acetic acid was increased as a product of acetogenesis from butyrate, valerate and ethanol. This study demonstrated that HRT affected acid fermentation of a carbohydrate containing organic wastes producing VFAs and ethanol which could be effectively used to compensate the lack of carbon in wastewater for biological nutrient removal.

Keywords

References

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