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http://dx.doi.org/10.11001/jksww.2019.33.3.177

Effect of infiltration/inflow by rainfall for sewerage facilities in the area with partially separate sewer system  

Shin, Jungsub (Department of Environmental Engineering, Kwangwoon University)
Han, Sangwon (Department of Sewerage, Korea Environmental Corporation)
Yook, Junsu (Department of Sewerage, Korea Environmental Corporation)
Lee, Chungu (Cheil Engineering Corporation)
Kang, Seonhong (Department of Environmental Engineering, Kwangwoon University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.33, no.3, 2019 , pp. 177-190 More about this Journal
Abstract
The purpose of this study was to analyze the effects of sewerage facilities through I/I analysis by rainfall by selecting areas where storm overflow diverging chamber is remained due to the non-maintenance drainage equipment when the sewerage system was reconstructed as a separate sewer system. Research has shown that wet weather flow(WWF) increased from 106.2% to 154.8% compared to dry weather flow(DWF) in intercepting sewers, and that the WWF increased from 122.4% to 257.6% in comparison to DWF in storm overflow diverging chamber. As a result, owing to storm overflow diverging chamber of partially separate sewer system with untreated tributary of sewage treatment plant, rainfall-derived infiltration/inflow(RDII) has been analyzed 2.7 times higher than the areas without storm overflow diverging chamber. Meanwhile, infiltration quantity of this study area was relatively higher than that of other study areas. Therefore, it is necessary to reduce infiltration quantity through sewer pipe maintenance nearby river. Drainage equipment maintenance should be performed not to operate storm overflow diverging chamber in order to handle the appropriate sewage treatment plant capacity for rainfall because it is also expected that RDII due to rain will occur after maintenance. In conclusion, it is necessary to recognize aRDII(allowance of rainfall-derived infiltration/inflow) and to be reflected it on sewage treatment plant capacity because aRDII can occur even after maintenance to the complete separate sewer system.
Keywords
Separate sewer system; Storm overflow diverging chamber; Rainfall-derived infiltration/inflow(RDII); I/I analysis;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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