A comprehensive analysis of storm water pollutants generation from urban roadway in Korea
- A comprehensive analysis of storm water pollutants generation from urban roadway in Korea
- 조강우; 송경근; 안규홍
- Event mean concentration; first flush; maximum divergence point; principal component analysis; storm runoff
- Issue Date
- IWA DIPCON 2010
- This study investigated the pollutants generation carried by urban storm water in Korea, with
focuses on the first flush and the role of particles on pollutants transport. A series of field
experiments were performed at an entry ramp of local expressway for 20 rainfall events. COD, SS,
nutrients (N, P), and heavy metals (Pb, Zn, Cu) were analyzed for total 236 runoff samples. The
event mean concentration (EMC) showed large variations, 23.2~592.4 NTU (turbidity),
20.4~341.6 mg/L (COD), 0.3~8.6 mg/L (TN), 0.01~2.4 mg/L (TP), 20.6~413.1 mg/L (SS),
22.8~905.4 μg/L (Pb), 37.8~1,668 μg/L (Zn), and 73.5~372.3 μg/L (Cu), respectively. The
individual pollutants concentrations as well as the EMC were governed by the cumulative rainfall
depth, a major consideration to design runoff control facilities. A remarkable contribution of this
study occurred in maximum divergence point (MDP) analysis to assess the degree of first flush.
The first flush appeared generally when the rainfall depths exceeded 20 mm, while MDP appeared
at 25 to 30% of total runoff volume. SS concentration was found to have significant correlation
with COD, TP, Pb and Cu concentration. A principal component analysis further demonstrated
that the particle concentration contributed to the variability of runoff water quality.
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