Polyethylene(hydrophobic)and polystyrene latex microspheres(hydrophilic),two kinds of microplastics widely used and frequently detected in water environment,were selected as representatives.The effect of the rainwater bioretention system consisting of 90%sandy soil and 10%feedwater sludge under different hydraulic retention time,ionic strength,pH and cation type was studied.The results showed that when the abundance of two kinds of microplastics in the water was 5.0×104,5.3×104 i-tems/L and HRT was 10 min,respectively,the beginning and complete penetration time of microplastics in the modified rainwater bioretention system was significantly delayed than that in the traditional rainwa-ter bioretention system.In the modified rainwater bioretention system,after HRT increased from 10 min to 30 min,polyethylene began to penetrate from 90 min(9 FVs)to 360 min(12 FVs),and polystyrene la-tex microspheres began to penetrate from 40 min(4 FVs)to 240 min(8 FVs).At high ionic strength(50.0 mmol/L),the system has a stronger ability to trap microplastics;pH and cation type have no sig-nificant influence on the retention effect of microplastics.
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