The purpose of this study was to evaluate the effect of implementing a Liquid Manure Circulation System (LMCS) on the environmental improvement of swine farms. Bacterial counts at different circulation phases of the LMCS were measured. Air in the swine facility and the liquid manure in each step of LMCS were sampled and gaseous composition detected in swine farms both with and without LMCS to compare the environmental conditions in either case. There were no differences in the total bacteria count at any circulation phase in the LMCS. Escherichia coli were detected at a very low abundance only at the outlet of the slurry pit (1.5×102CFU/㎖). Salmonella were not detected at any phase. The LMCS clearly affected the odor strength of the swine farm and improved the air quality in the swine facility. On-site odor strength - inside, at the exhaust, and at the border of the swine facility - were clearly lowered in farms applying LMCS. Furthermore, the levels of ammonia, hydrogen sulfide, and carbon dioxide were improved in swine facilities applying LMCS.

Abstract
 1. 서론
 2. 재료 및 방법
  2.1. 조사농장
  2.2. 액비 및 악취분석
  2.3. 환경상태
  2.4. 통계분석
 3. 결과 및 고찰
  3.1. 액비순환
  3.2. 액비성상
  3.3. 악취농도
  3.4. 환경상태
 4. 결 론
 REFERENCES

• 하덕민(경남과학기술대학교) | Ha Duck-Min (Department of Animal Resources Technology, Gyeongnam National University of Science and Technology)
• 김두환(경남과학기술대학교) | Kim Doo-Hwan (Department of Animal Resources Technology, Gyeongnam National University of Science and Technology) Corresponding author