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Removal of E. coli from stormwater by bioretention system: parameter optimization and mechanism
Jianwei Liu1, Peng Yue1, Yan He1
1Beijing Research Center of Sustainable Urban Drainage System and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China and College of Environmental and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
Abstract:
Four bioretention simulation columns were used to study the removal effects and influencing factors of Escherichia coli (E. coli) in stormwater. The mechanism of E. coli removal in the bioretention system was also analyzed. The results show that the removal effects of the four new composite filters are better than that of the conventional filter. The specific surface area and porosity of the filter may be the key factors affecting the removal effect; the increase of the filter depth is beneficial to the removal of E. coli; the area is conducive to the removal of E. coli. Excessive depth of the submerged zone will reduce the E. coli removal effect; drying will reduce the E. coli removal effect, but it can be restored by rewetting.
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