The purpose of this study was to develop a recycling system for ozone off-gas. Although the ozone transmission rate of the injector method differs slightly depending on the ozone injection rate, it reaches approximately 99%, which is very high. During the increase in water inflow to the ozone recycling system from 2 L/min to 10 L/min, the average ozone recycling rate was 99.4% at a 1 ppm ozone injection rate, 98.6% at a 2 ppm ozone injection rate, 98.1% at a 3 ppm ozone injection rate. Ozone treatment facility operating costs can be divided into the costs of pure oxygen production, ozone production, and maintenance. The annual operating costs of ozone treatment facilities in Korea are estimated to be approximately 38.9 billion won. The annual savings are estimated to be approximately 5.8 billion won when the ozone transfer rate of the diffuser method, which is mostly employed in domestic water treatment plants, is 85% and 15% of the ozone is recycled.

Abstract
1. 서 론
2. 실험장치 및 방법
    2.1. 실험 장치
    2.2. 실험 방법
3. 결과 및 고찰
    3.1. 후오존 접촉조 오존 이용률
    3.2. 배오존 재활용 효율
    3.3. 경제성 분석
4. 결 론
REFERENCES

• 조영만(㈜한국이엔지) | Young-Man Cho (Hankook eng.)
• 정재억(㈜한국이엔지) | Jae-Ouk Jung (Hankook eng.)
• 이광헌(광운대학교) | Kwang-Heon Lee (Department of Environmental Engineering, Kwangwoon Unversity)
• 정용준(부산가톨릭대학교) | Yong-Jun Jung (Department of Environmental Engineering, Catholic University of Pusan) Corresponding author