In this study, air scouring cleaning was selected and applied among 5 small blocks (S1~S5) in domestic S cities to analyze the cleaning effect of particles causing discoloration. In order to identify the cleaning effect, 10 locations were selected as water quality investigation point, such as the stagnant or water mains ends. Removal of solids, variation of particle components, weight and concentration were analyzed. And the level of the cleanness of the surface inside water mains using endoscope was investigated. As a result of analysis, the solids discharged after cleaning were mainly sand and gravel, pieces related to pipe materials, and corrosion products. As a result of analyzing the concentrated particles of the filter before and after cleaning, it was found that the change in discoloration on the filter was large. In addition, as a result of comparing the weight and the concentration of the particles, it was found that the particles causing discoloration were significantly removed after cleaning. From the results of the endoscopy, it was confirmed that most of the precipitated and accumulated dark yellow discoloration matters inside water mains were removed through cleaning. Therefore, it seems that the particles causing discoloration in water decreased after cleaning. Therefore, it is expected that, if properly cleaning was applied, matters that cause discoloration can be removed from the water mains, and customer's complaints can also be reduced through water quality improvement.

ABSTRACT
1. 서 론
2. 연구방법
    2.1 대상 구간
    2.2 세척방법
    2.3 수질 조사지점
    2.4 효과분석
3. 연구결과
    3.1 세척에 따른 유출 고형물 유형 분석
    3.2 세척 전후 입자포집 분석 결과
    3.3 세척 전후 관내면 상태변화
4. 결 론
References

• 이호민(한국수자원공사 K-water연구원) | Ho-Min Lee (K-water Research Institute, Korea Water Resources Corporation)
• 최태호(한국수자원공사 K-water연구원) | Tae-Ho Choi (K-water Research Institute, Korea Water Resources Corporation)
• 윤현우(한국수자원공사 K-water연구원) | Hyun-Woo Yun (K-water Research Institute, Korea Water Resources Corporation)
• 김동홍(한국수자원공사 전남지역협력단) | Dong-Hong Kim (Jeonnam Regional Collaboration Office, Korea Water Resources Corporation)
• 배철호(한국수자원공사 K-water연구원) | Cheol-Ho Bae (K-water Research Institute, Korea Water Resources Corporation) Corresponding author