초록

본 연구를 통해 개발된 환기시스템 및 악취저감 장치의 효과외에 분뇨물성개선 자율제어모델은 슬러리피트 내 분뇨 물성 개선을 통한 유해가스 및 악취저감효과가 우수할 것으로 기대된다. 또한, 분뇨의 물성이 개선됨에 따라 자원화 공정의 처리효율 향상이 예상되며 돈분뇨를 통해 환경으로 배출되는 오염물질의 환경부하 저감효율이 매우 우수할 것으로 기대된다. 따라서, 개발된 자율제어모델의 현장에서의 적용 확대 및 독려를 위한 현장적용 실증연구가 후속되어야 할 것으로 사료된다.

(출처 : 요약서 3p)

Abstract ▼

□ Purpose&Contents
Swine manure in slurry pit contains high concentration of pollutants and can deteriorate the indoor air quality of the swine barn by emitting various harmful gases such as CH₄, CO₂, NH₃ and H₂S. Emission of harmful gases result in a d

□ Purpose&Contents
Swine manure in slurry pit contains high concentration of pollutants and can deteriorate the indoor air quality of the swine barn by emitting various harmful gases such as CH₄, CO₂, NH₃ and H₂S. Emission of harmful gases result in a decline of swine productivity as well as increase the odor relatedcomplaints from the neighborhood and ultimately threatening the survival of the swine industry. Most of the prior odor reduction facilities have been focused on controlling the odor to spread outside of the swine barn. However, very few studies have been conducted to reduce the concentration of harmful gases inside the swine barn. Therefore, this study was carried out to improve of swine manure properties and decrease the concentration harmful gases through automatic circulation between the slurry pit and bioreactor. The ORP, pH and DO were monitored in the bioreactor to formulate the optimal control algorithm. Based the algorithm, a real time automatic control model (ACM) was developed and applied to an experimental swine barn with 10 pigs. Theperformance of the developed ACM were analyzed based on the improvement in the swine manure properties and NH₃ reduction efficiency.

□ Results
As a result of the conversion of the half-windowless type (side wall curtain type, side wall inlet and chimney exhaust type) to windowless type (ceiling entry; winter, side wall entry; summer, sidewall exhaust) pig barn, the internal temperature of the half-windowless pig barn was 20.3 ℃, which was markedly different from the windowless pig barn (23.7 ℃). In addition, during the midday of the cold season (July), the half-windowless pig barn has a high internal temperature of 32.7 ℃ due to the direct inflow of air from the outside, while the windowless pig barn is less affected by outside temperature than the half-windowless pig barn. Therefore, windowless pig barn showed lower internal temperature (30.7 ℃) than half-windowless pig barn. As a result of improving the pig barn ventilation system, the air velocity in the half-windowless type pig barn was 0.12, 0.15 and 0.13m / s at the front,middle and rear location, while the windowless type was 0.27, 0.25 and 0.21 m/ s at the front, middle and rear location. The windowless type showed about twice the air velocity than the half-windowless type, which satisfies the wind velocity level around 0.2-0.4m/s, which is suitable for the living space inside the pig barn during summer. Based on the monitoring results of ORP, pH and DO in the operated bioreactor, diagnostic technique was developed to accurately detect the end point of nitrate reduction and ammonia-N oxidation according to bioreactor operation. Using this, the optimal control algorithm was develop. The optimal control algorithm was used to construct a real time ACM and tested in an experimental swine barn to control the circulation of swine manure between slurry pit and bioreactor for improving swine manure properties. The area of the experimental swine barn was 12m² and slurry pit working volume was 9 tons.

□ Expected Contribution
The slurry pit was connected to a bioreactor with working volume of 3 tons.
The whole process was operated for 50 days and the results showed that the ACM autonomously circulated the swine manure between the slurry pit and bioreactor 446 times with an average of 5.2 cycle/d, representing approximately 17.8% of the slurry pit volume was circulated per day. Consequently, above 70% removal efficiency was observed in ammonia-N and solids concentration while total nitrogen removal efficiency was 64.1%. Due to the circulation of swine manure between the slurry pit and bioreactor, harmful gases generation was decreased and the NH₃ concentration in swine barn was reduced by about 61.6% (ACM 5.6 NH₃ ppm, Non-ACM 14.6 NH₃ ppm). The ACM developed inthis study is expected to be effective in reducing generation of harmful gases and odor by improving swine manure properties in slurry pit. In addition, as the properties of swine manure are improved, the treatment efficiency of the recycling process should be improved, and the pollutants discharged to the environment from swine manure is expected to be reduced. Considering the above, the ACM developed in this study therefore should be encouraged to apply in the swine farms for effective swine manure management. For this purpose, technical demands were proposed to related organizations such asRural Development Administration and the Institute of Planning andEvaluation for Technology in Food, Agriculture and Forestry. In addition, the patent registration regarding the control algorithm will be completed soon, which is the core of the ACM.

(출처 : SUMMARY 6p)

목차 Contents

• 표지 ... 1
• 제 출 문 ... 2
• 보고서 요약서 ... 3
• 국 문 요 약 문 ... 4
• Summary ... 6
• 목차 ... 8
• 제 1 장 연구 개발 과제의 개요 ... 9
• 제1절 연구 개발 목적 ... 9
• 제2절 연구 개발의 필요성 ... 9
• 제3절 연구 개발 범위 ... 10
• 제 2 장 연구 수행 내용 및 결과 ... 10
• 제 3 장 목표달성도 및 관련분야 기여도 ... 164
• 제1절 목표대비 달성도 ... 164
• 제2절 정량적 성과 ... 166
• 제 4 장 연구 결과의 활용 계획 ... 166
• 제 5 장 연구 개발 결과의 보안 등급 ... 166
• 제 6 장 연구시설·장비종합정보시스템에 등록한 연구시설·장비 현황 ... 166
• 제 7 장 연구개발과제의 대표적 연구실적 ... 167
• 제 8 장 기타사항 ... 167
• 제 9 장 참고문헌 ... 167
• 끝페이지 ... 169