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J Korean Soc Environ Eng > Volume 38(4); 2016 > Article
J Korean Soc Environ Eng 2016;38(4): 210-218. doi: https://doi.org/10.4491/KSEE.2016.38.4.210
침강에 의한 도시 강우 유출수 오염물질 저감 특성 분석
서동일, 김재영
충남대학교 환경공학과
Reduction of Pollutant Concentrations in Urban Stormwater Runoff by Settling
Dongil Seo, Jaeyoung Kim
Department of Environmental Engineering, Chungnam National University
Corresponding author  Dongil Seo ,Tel: 042-821-6679, Fax: 042-822-5610, Email: seodi@cnu.ac.kr
Received: March 15, 2016;  Revised: April 6, 2016;  Accepted: April 12, 2016.  Published online: April 30, 2016.
ABSTRACT
The pollutant removal efficiencies of stormwater runoff by settling were analyzed using field samples collected in 4 different raining events in a test bed installed in the Gwanpyung-Cheon stream in Daejeon. A 1.8 m high with 30 cm diameter cylindrical settling device was used for the settling test by measuring concentration of TSS, TP and TN for time and height. The pollutants removal rate was relatively high in the first 4 hours while 24 hours seem to be necessary to reach steady state in pollutant concentrations. However, there were no considerable differences in concentrations for height at a given time. This indicates most of particulate pollutant in the test seems to show independent settling with no interference to each other. Much part of particle sizes were distributed in the range of 10~100 µm. Average particulate fractions of TP and TN were estimated as 52.4% and 23.5%, respectively. This results explain why TN is difficult to remove by simple settling. This study indicates that a simple settling can provide effective method to remove significant amount of TSS and TP effectively and this can be used to protect urban river water quality.
Key Words: First Flush, Stormwater Runoff, Settling Column Test, Nonpoint Source Pollutant, Water Quality Management
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