Progress on the improvement of urban stormwater runoff quality by bioretention

Proper and effective control of the non-point source pollution causing by stormwater runoff has become a major challenge for many urban managers.Bioretention as one of the best management practices(BMPs) of urban stormwater could be employed for effective control the non-point source pollution.This paper summarizes the research progress of bioretention for improving urban stormwater runoff quality,and presents the associated pollutant removal mechanisms simultanly.The literature data of select field and lab studies have demonstrated that bioretention is effective for removing TSS,heavy metals,oil grease and pathogenic bacteria from stormwater runoff,while its nutrient removal effectiveness is not stable depending on the variable local factors such as the soil composition and plant type.Finally,promising research directions of bioretention for improving stormwater runoff quality are predicted.