The water quality in most of rivers and lakes were improved to Level Ⅰ-Ⅲ of water quality standard by managing point sources in Korea, whereas the aqua-ecosystems are still affected by various pollutants such as metals, PAH, toxic chemicals from stormwater runoff caused by advanced land-use. The toxic materials in waterbodies are an important concern on water quality policy for aqua-ecosystems and humans. Toxic chemicals originated from human activities are transformed and transported to nature and accumulated in biotics, which is finally affected to human health. This research was performed to investigate the characteristics of pollutant discharges from urban areas by focusing on metals. Metal reduction by four LID facilities (Infiltration Trench, 2 Small Wetlands, Tree-box filter) was determined by measuring the flow rates and pollutant concentrations from runoff. The discharged mass of metals from urban areas was positively proportional on the dry days with the consideration of the relationship on rainfall characteristics. The function of volume reduction in LID contributes high metal reduction by long contact opportunities of pollutants with media, microorganisms and plants. More research works are needed to find bioaccumulation of toxic chemicals, to derive the removal mechanisms of chemicals, and to determine the cost-effective management tools.
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