호기발효조에서 발생된 산화열에 의하여 혐기소화조의 가온 가능성의 검토

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