호기발효시스템에 있어서 고질소 함유 가축폐기물의 부하율이 질소제거효율에 미치는 영향 = Effect of Loading Rate of Animal Waste Containing High Nitrogen on the Removal Efficiency of Nitrogen in Aerobic Fermentation System

다국어 초록 (Multilingual Abstract)

This study was conducted to develop a treating technique to get rid of nitrogen from the animal waste containing high nitrogen by aerobic fermentation. The effect of loading rate on the removal efficiency of nitrogen was examined by using both a lab- and a pilot-scale aerobic fermentation system. Anaerobic fermentation residue of swine waste achieved from a pilot-scale anaerobic fermentation system was used as substrate in these studies. The loading rates applied to the lab-scale study were 54.24, 162.72, and 271.20 g N/㎥/day, respectively, and to the pilot-scale study were 43.4, 56.8, 126.4, and 142.8 g N/㎥/day, respectively. A 5-day hydraulic retention time (HRT) was provided to the lab-scale system and to a 1-day HRT for the pilot-scale system. Results obtained in both lab- and pilot-scale studies were similar. The removal rate of kjeldahl nitrogen significantly increased as the loading rate increased (P$lt;0.01). The removal rate of ammonia-N tended to increase as the loading rate increased. The removal rate of biological oxygen demand increased as the loading rate increased (P$lt;0.01), while no statistical differences were observed in the removal rate of the suspended solids (SS). The removal rate of phosphorus increased as the loading rate decreased (P$lt;0.05), which showed an adverse trend of the removal rate of organic mattes such as nitrogen and SS. The results obtained from this study suggest that the loading rate should be considered as crucial factors to remove nitrogen from the animal waste containing high nitrogen by aerobic fermentation.