This study aimed to develop a water spray-based removal technology for floating solids accumulated on the upper layer of slurry in liquid manure circulation systems, which hinders the long term and continuous operation of these systems in swine farms. The performance of floating solids removal was evaluated by varying the number of nozzles, nozzle diameter, and pump flow rate. Increasing the number of nozzles from four to seven substantially improved overall removal performance, with the seven-nozzle configuration demonstrating the highest removal amount and rate. Nozzle diameter was identified as a key design parameter balancing cleaning speed and water-use efficiency. The 2 mm nozzle provided the best balance between removal time and water consumption, while larger diameters tended to reduce removal efficiency because spray pressure was distributed over a wider area. In the pump flow rate comparison, the 140 L/min condition slightly increased removal time but reduced water consumption, making it the most efficient option for long term operation. This condition reduced the total spray volume required to reach the target removal level, suggesting strong potential to improve both economic feasibility and resource efficiency. Overall, the optimal operating combination for maximizing floating solids removal efficiency was determined to be seven nozzles, a 2 mm nozzle diameter, and a pump flow rate of 140 L/min. These results provide practical design criteria for integrating spray based floating solids control into existing pit circulation systems and offer a basis for future field scale validation under different slurry properties, pig housing structures, and seasonal operating conditions.

ABSTRACT
Ⅰ. 서론
Ⅱ. 재료 및 방법
    1. 시험설계
    2. 시험장소
    3. 조사내용 빛 방법
    4. 통계 분석
Ⅲ. 결과 및 고찰
    1. 노즐 수와 부유물 제거 효율
    2. 노즐 직경과 부유물 제거 효율
    3. 펌프 유량과 부유물 제거 효율
    4. 노즐 및 펌프 유량에 따른 부유물 제거 효율
Ⅳ. 요약
사사
Ⅴ. 참고문헌

• 김두환(경상국립대학교 축산과학부 교수) | DooHwan Kim (Professor, Division of Animal Science, Gyeongsang National University, Jinju 52828, Korea) Corresponding author
• 한정철(부경양돈농협 사료사업부 과장) | JeongCheol Han (Manager, Feed Business Division, Bukyung Swine Cooperative, Gimhae 50925, Korea)
• 하덕민(경상국립대학교 농식품바이오융복합연구원 연구원) | DuckMin Ha (Researcher, Agri-Food Bio Convergence Institute, Gyeongsang National University, Jinju 52828, Korea)