Removal Patterns of Pollutants during Dry and Wet Days in a Stormwater WetlandReport as inadecuate




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A 0.23-ha pilot wetland was constructed to examine its effectiveness for the control of nonpoint source pollution NPS from a 7.42-ha agricultural watershed in Korea. This wetland have been operated as a demonstration site of national BMPs facilities in the Han River Basin, Korea. This research emphasized the removal patterns of particulate and dissolved forms of pollutants on both dry base flow and wet days storm flow. The hydraulic loading rates were high on rainy days, with an average value of 0.78 m-day, but around 0.08 m-day on dry days. Particulate forms of pollutants, such as SS, COD and TP, were removed to a greater extent on wet days due to sedimentation. On wet days, the incoming concentrations of NH4-N and soluble reactive phosphorus SRP were higher than during dry days, and can be partly retained via filtration and adsorption as they go through the wetland. Nitrogen has an average retention of around 20% on dry days, higher than the 6% removal on wet days.

KEYWORDS

Dry and wet days; nonpoint source pollution; patterns of pollutants; stormwater wetland

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Author: Qitao Yi, Jiaping Yan, Jianghua Yu, Youngchul Kim

Source: http://www.scirp.org/



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