| Title |
Comparison of Characteristics of Nonpoint Source Pollution from Separate and Combined Sewer System |
| Authors |
신민환 ( Minhwan Shin ) ; 전지홍 ( Ji-hong Jeon ) |
| DOI |
https://doi.org/10.15681/KSWE.2017.33.1.97 |
| Keywords |
Combined sewer system; Nonpoint source pollution; Separate sewer system; Urban runoff |
| Abstract |
In this study, the characteristics of nonpoint source pollutant loads from separate sewer overflow (SSO) and combined sewer overflow (CSO) were evaluated during 2016 in Namyangju city, Korea. Five rainfall events were monitored during 2016 with ranging from 14.5 mm to 121.5 mm. The runoff ratio of CSO was higher than that of SSO because only design volume of maximum sanitary sewer (1Qh) was transported and treated and 2Qh was overflowed to waterbody during rainy day although combined sewer system was designed to transport 3Qh to treatment system. The event mean concentrations (EMCs) and pollutant loads from CSO were higher than those from SSO. BOO and COD of CSO, and TOC and TN of SSO represented distinct first flush phenomena. The inadequate management in combined sewer system from which the untreated 2Qh from CSO was overflowed to waterbody during rainy day could influence on high pollutant loads and first flushing. Treating 2Qh from CSO, source control such as low impact development, and treating outflow from SSO were strongly recommended to control non-point source pollution in urban area. |