In this study, field-scale half-saturated bio-filter wetland equipped with recirculation system was operated with
stormwater from the paved road, and its operational performance and functions of LID-BMP were analyzed and
compared with other facilities. The reduction of TSS, COD, TN, and TP were 92%, 63%, 36%, and 75%, respectively.
Comparison of the reduction efficiency were carried out with respect to ratio between surface and catchment
areas(SA/CA). In addition, this LID-BMP facility can reduce about 70% of pollutant by treating only 18% of total
rainfall runoff. The results show that LID used for this study gave similar efficiency although its ratio was smaller. In
addition, comparison study was made between synthetic fiber as a filter media and organic media, which shows that
there was not any significant difference between, TSS and TP reduction, but there were large difference in COD and
TN removal due to the presence and absence of release of organic carbon. Meanwhile, wetland system in this study
equipped with a first-flush capture gave a higher stability in terms of treatment performance.