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http://dx.doi.org/10.4491/KSEE.2012.34.11.720

Correlation of Nonpoint Pollutant and Particulate Matters at a Small Suburban Area  

Park, Ji-Young (Department of Construction & Environment Engineering, University of Science & Technology)
Bae, Sang-Ho (Department of Water Ecosystem Facilities, Korea Environment Corporation)
Yoon, Young-H. (Environmental Engineering Research Division, Korea Institute of Construction Technology)
Lim, Hyun-Man (Environmental Engineering Research Division, Korea Institute of Construction Technology)
Park, Jae-Roh (Environmental Engineering Research Division, Korea Institute of Construction Technology)
Oh, Hyun-Je (Environmental Engineering Research Division, Korea Institute of Construction Technology)
Kim, Weon-Jae (Environmental Engineering Research Division, Korea Institute of Construction Technology)
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Abstract
In general, nonpoint pollutant of a watershed is drained out in the form of storm water runoff during rainfall events. As the bulk of the nonpoint pollutant is in adsorbed form on particulate matters, in order to understand the behavior of nonpoint pollutant it is essential to grasp the characteristics of particulate matters in rainfall runoff. Though, previous studies for the relationship between the runoff characteristics of pollutants and the size distribution of particulate matters are very rare. In this study, a small non-urbanized area (basin area of 52.8 ha) with various landuse types including paddy, dry fields and forest was selected and investigated in detail for the runoff properties of each pollutant during several rainfall events. The correlation and effects between particulate matters and nonpoint pollutant were analyzed quantitatively. As a result, the significant first flush was observed on each event and it became clear that fine particulate matters ($80{\mu}m$ or less) has contributed in the runoff process of nutrients and heavy metals. Organic matters ($BOD_5$, TOC), nutrients (TN, TP) and several heavy metals (Al, Cr, Cu, Fe, Hg and Zn) represented high correlations with SS (total), VSS, SS (d < $20{\mu}m$) and SS ($20{\mu}m$ $$\leq_-$$ d < $80{\mu}m$). On the other hand, $COD_{cr}$, Cd, Mn and Pb did not show clear correlations with the behavior of particulate matters. Therefore, we have to examine the introduction of nonpoint pollution mitigation facilities considering the facts that nonpoint pollutant runoff process has high correlation with the behavior of particulate matters and is changeable based on the target pollutants.
Keywords
Suburban Area; Runoff of Nonpoint Pollutant; Particle Size Distribution; First Flush; Landuse Type;
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