초록 ▼

Ⅳ. 연구개발결과
본 연구를 통해서 달성한 연구결과는 액비화조 운영 현황 분석, 액비화조 침전슬러지 특성 분석, 현장 문제점 해결을 위한 시험장치 구조 개발, 개발기술 적용시험의 장단점 분석 및 기술보완, 현장 적용형 폭기효율 증진기술 개발, 현장 적용형 모델개발, 개발기술 산업화 추진 등으로 요약된다. 본 연구의 수행과정에서 현장 적용형 폭기효율 증진기술 액비화조내 슬러지 제어기술 및 현장 적용형 모델개발을 수행하였으며 최종적으로는 액비 성분 균질화 기술을 농업 현장에서 적용할 수 있는 기술을 개발하였다. 정량적 연구결과로서

Ⅳ. 연구개발결과
본 연구를 통해서 달성한 연구결과는 액비화조 운영 현황 분석, 액비화조 침전슬러지 특성 분석, 현장 문제점 해결을 위한 시험장치 구조 개발, 개발기술 적용시험의 장단점 분석 및 기술보완, 현장 적용형 폭기효율 증진기술 개발, 현장 적용형 모델개발, 개발기술 산업화 추진 등으로 요약된다. 본 연구의 수행과정에서 현장 적용형 폭기효율 증진기술 액비화조내 슬러지 제어기술 및 현장 적용형 모델개발을 수행하였으며 최종적으로는 액비 성분 균질화 기술을 농업 현장에서 적용할 수 있는 기술을 개발하였다. 정량적 연구결과로서는 산업재산권과 논문 그리고 영농활용 정책건의 등의 성과를 달성하였다.

Abstract ▼

Three types of aeration system were installed in experimental liquid fertilization tanks to investigate the change of characteristics of pig slurry used as a raw material for making livestock liquid fertilizer. The aeration systems of the reaction tanks were composed of three major part: the air sup

Three types of aeration system were installed in experimental liquid fertilization tanks to investigate the change of characteristics of pig slurry used as a raw material for making livestock liquid fertilizer. The aeration systems of the reaction tanks were composed of three major part: the air suppling part (blower), the air pipe part, and the air diffuser part. In the first tank (reactor A), the air was supplied from the bottom of the reaction tank through air pipe system connecting air diffuser with commercial ordinary blower. In the second tank (reactor B), the air diffuser was located 10 cm above the bottom of the reactor. In the third tank(reactor C), the pure air was supplied with circulating pjg slurry. The oxygen content of pure air was about 90%. The pure air was mixed with pig slurry by mechanically in the air suppling part (blower) and the air pipe part. The agitation effect was highest in the reactor C than other reactors. The contents of SS, COD, T-N and T-P of each samples collected at middle part of all reactors were 8,500, 4,188, 694 and 422 mg/L; 9,000, 4,247, 813 and 356 mg/L; 8,667, 6,910, 973 and 269mg/L, respectively.
Two types of reactors were set to investigate the change of characteristics of pig slurry by aeration during fertilization period. One system was equipped with air diffuser to supply oxygen to pig slurry for liquid fertilization, but there was no air diffuser in the other system. Air supply to the experimental systems was regulated by air flow meter. The reactors were set up in the laboratory to protect the pig slurry from external condition such as temperature and humidity changes.
Maintaining optimal pH range in the experimental reactors is an important factor for liquid fertilization of pig slurry. In this study, pH ranges of aerobic reactor and anoxic reactor was 7.04∼7.19 and 7.34∼7.81, respectively. The temperature of aerobic reactors was 2∼3 ℃ higher then indoor temperature. The amount of sludge accumulated at the bottom layer of non-aerated reactors was 4∼5 times more than that of aerated reactors.
Three types of diffuser systems were manufactured and applied to investigate the effect of liquid fertilization of pig manure slurry by application of aeration processes. In the first type reactor, commonly used diffuser system, which diffuse air upward by diffusing aerator fixed at the bottom of the reactor is installed. In case of the second type, air diffuser is installed 10 cm above of the bottom of a reactor. In the third type reactor, the venturi-type air diffuser is installed at circulation pipe, which return pig slurry in the reactor(mixing-in-pipe process). The pig manure slurry separated to solid / liquid was flowed into the experimental reactor, and left as it for one week to precipitate solids. The concentration of organic matter, T-N, T-P and BOD in the raw pig manure slurry flowed into the reactor of bottom-fixed type aeration process were 1.82%, 4,400 mg/L, 360 mg/L and 13,542 mg/L, respectively. After aeration the concentration of organic matters, T-N, T-P and BOD in the slurry were 2.01%, 4,400 mg/L, 420 mg/L and 16,824 mg/L, respectively. The concentration of organic matter, T-N, T-P and BOD in the mixing-in-pipe type changed from 1.58%, 3,700 mg/L, 260 mg/L and 15,735 mg/L to 1.96%, 4,000 mg/L, 340 mg/L, and 18,098 mg/L, respectively. Changes of the concentration of organic matter, T-N, T-P and BOD of the pig manure slurry collected from the middle layers of two aeration reactors; bottom aeration process and the mixing-in-pipe process, were 10.4%, 0%, 16.7% and 24.2% and 24.0%, 8.1%, 30.8% and 15.0%, respectively. The thickness of foam layer generated on the surface of pig manure slurry in aeration tank was thinner in mixing-in-pipe reactor than bottom-fixed type aeration reactor.