Due to lack of established operating conditions, the swine manure management process circulates bio-liquor between the slurry pit and the bioreactor process cannot be effectively used yet. Therefore, a lab scale study comprising a single bio-reactor and slurry pit was conducted to investigate the optimal operating conditions. The main experiment was performed after conducting a preliminary study on the operating conditions. In the preliminary study, the volume ratio of the bioreactor to the slurry pit was fixed at 1 and hydraulic retention time (HRT) of the bioreactor was set as 5, 10 and 15 d. In the main experiment, the HRT of the bioreactor was fixed at 5 d based on preliminary results and the ratio of bioreactor to slurry pit was set at 1:3, 1:5, 1:7 and 1:10. Since, a decrease in bioreactor performance occurred when NH4-N loading rate reached 60 g/m3/d, the loading rate of NH4-N was required to be maintained below 55 g/m3/d to achieve stable operation. Although manure excretion can definitely increase the loading rate into the bioreactor as well as NH4-N concentration in the slurry pit, the NH4-N in slurry pit can be kept consistent with the circulation rate above 9.5Q (ratio to manure excretion). The optimal volume ratio of the bioreactor to the slurry pit and HRT of the bioreactor to fulfill these operating conditions was 1:3 and 5d, respectively. Notably, studying of the individual farm situation is very important to establish an ideal method to apply the optimal operation conditions suggested in this study.

ABSTRACT
Ⅰ. 서론
Ⅱ. 재료 및 방법
    1. 실험 설계
    2. 시스템 구성 및 운전·실험방법
    3. 분석 항목 및 방법
Ⅲ. 결과 및 고찰
    1. 순환에 따른 생물반응조 및 슬러리피트 내 NH4-N 농도 변화
    2. 적정 생물반응조 규모 및 순환율
    3. 생물활성액 순환에 따른 분뇨관리 효과
Ⅳ. 요약
Ⅴ. 참고문헌

• 김승수(강원대학교 동물생명과학대학 동물산업융합학과) | Seung Soo Kim (Department of Animal Industry Convergence, College of Animal Life Science, Kangwon National University)
• 심수민(강원대학교 동물생명과학대학 동물산업융합학과) | Soo Min Shim (Department of Animal Industry Convergence, College of Animal Life Science, Kangwon National University)
• 이태훈(강원대학교 동물생명과학대학 동물산업융합학과) | Tae Hoon Lee (Department of Animal Industry Convergence, College of Animal Life Science, Kangwon National University)
• 전태빈(강원대학교 동물생명과학대학 동물산업융합학과) | Tae Been Jeon (Department of Animal Industry Convergence, College of Animal Life Science, Kangwon National University)
• 원승건(대구대학교 과학생명융합대학 동물자원학과) | Seung Gun Won (Department of Animal Resources, College of Natural and Life Sciences, Daegu University)
• 송준익(천안연암대학 축산계열) | Jun Ik Song (Animal Husbandry, Cheonan yonam College)
• 정배동(강원대학교 수의과대학 수의예과) | Bae Dong Jung (Department of Veterinary Science, Kangwon National University)
• 이종재(강원대학교 동물생명과학대학 동물산업융합학과) | Jong Jae Lee (Department of Animal Industry Convergence, College of Animal Life Science, Kangwon National University)
• 라창식(강원대학교 동물생명과학대학 동물산업융합학과) | Changsix Ra (Department of Animal Industry Convergence, College of Animal Life Science, Kangwon National University) Corresponding author