Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Comparison of Anaerobic Digestion Efficiency with Different Temperature of Food Wastes

음식물류폐기물의 성상별 온도변화에 따른 혐기성소화 효율 비교 연구

  • Hwang, Kwanghyun (Building Science Research Team, GS E&C Research institute) ;
  • Kim, Dongik (Department of Civil, Environmental and Architectural Engineering, Korea University Graduate School)
  • 황광현 (GS건설 건축환경연구팀) ;
  • 김동익 (고려대학교 건축사회환경공학과)
  • Received : 2019.04.02
  • Accepted : 2019.07.15
  • Published : 2019.07.30
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Abstract

A comparative study on the anaerobic digestion efficiency according to the temperature change was conducted considering the characteristics of domestic food wastes with high water content of about 80 % or more. The substrate was tested for anaerobic digestion efficiency in two substrates, a liquid component separated naturally from food waste and food waste itself. In the anaerobic digestion experiments, the digestion efficiency was the highest at $55^{\circ}C$ (thermophilic temperature). However, the digestion efficiency at $45^{\circ}C$(middle high temperature) was lower than that at $35^{\circ}C$(mesophilic temperature). The comparison of general food wastes anaerobic digestion requiring 30 days of hydraulic retention time to the liquid component indicated a stable digestion efficiency even after 15 days of hydraulic retention time.In the experiments conducted on food waste, the digestion efficiency at $55^{\circ}C$ was higher than that at $35^{\circ}C$. When the food waste, especially the liquid component originating from food waste, is treated by anaerobic digestion method, the mesophilic temperature and thermophilic temperature conditions are more favorable in the digestion efficiency than the middle high temperature ($45^{\circ}C$). However, when applying thermophilic or mesophilic temperature anaerobic digestion process operation in the field, the amount of energy input should be considered.

Keywords

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Fig. 1. Reduction profiles of anaerobic digestion treating liquid component of food waste. (a) TS, (b) VS

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Fig. 2. Methane production of anaerobic digestion treating liquid component of food waste

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Fig. 4. Methane production of anaerobic digestion treating food waste

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Fig. 3. TS and VS reduction of anaerobic digestion treating food waste

Table 1. Characteristics of two substrates (food waste, liquid component of food waste)

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Table 2. The results of anaerobic digestion treating liquid component of food waste

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Table 3. The results of anaerobic digestion treating food waste

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