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Study on Possibility of Temperature Maintenance of Anaerobic Digestion Reactor by Oxidation Heat Generated in Aerobic Fermenter

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한국폐기물자원순환학회지 (Journal of Korea Society of Waste Management)
한국폐기물자원순환학회 (Korea Society Of Waste Management)
초록

This research examined the possibility of the temperature maintenance of an anaerobic digestion reactor without external heating by the oxidation heat generated in an aerobic fermenter, considering the difficulties of anaerobic digestion because of the winter season in Korea. For the experiment, an anaerobic digestion chamber was installed inside, the device with aerobic fermentation installed outside was used, the anaerobic digestion chamber was covered, and the raw material was used in the perspective of handling livestock excretion and food waste. During 230 days of operation in total, normal operation was started after about 120 days, and during that operating time, the temperature change, degradation behavior of organisms, and digestion yield were analyzed; the results are shown below. In the situation excluding the aerobic reactor in the summer season, maintaining the temperature of the digestion chamber at 30°C was possible through heat storage within the house, but the temperature decreased to about 20°C because of the outside temperature in the winter season, and maintaining the temperature of the digestion chamber at 25°C was possible as long as the aerobic fermentation chamber maintained its temperature of more than 50°C. Regarding the results for the effects of the inside and outside temperature of the house on the aerobic reactor chamber temperature, a significant effect was not examined, and it was identified that the aerobic reactor temperature relied on the degree of aerobic microorganism vitalization. When using a hot-water system with solar heat, the possibility of usage as complementary energy in the unstable winter season was checked. Even in the winter season, maintaining the temperature of the anaerobic digestion chamber without external heating was possible, and even during the time of operation, although the temperature changed from 25°C to 38°C, methane gas was stably produced.

저자
  • 최우석(서울과학기술대학교 일반대학원 환경공학과) | Woo-Seok Choi (Department of Environment Engineering, Graduate School, Seoul National University of Science and Technology)
  • 조준연(서울과학기술대학교 에너지환경대학원 에너지환경공학과) | Jun-Yeon Cho (Department of Energy Environment Engineering, Graduate School of Energy & Environment, Seoul National University of Science and Technology)
  • 배재근(서울과학기술대학교 에너지환경대학원 에너지환경공학과) | Chae-Gun Phae (Department of Energy Environment Engineering, Graduate School of Energy & Environment, Seoul National University of Science and Technology) Corresponding author