Removal Performance and Mechanism of Microplastics by Coagulation-Sedimentation Process
The removal performance of microplastics(MPs)in water by coagulation-sedimentation process was examined,employing hydrophilic polyethylene terephthalate(PET)and hydrophobic polyvinyl chloride(PVC)as the prototypes of microplastics.The removal efficiency of MPs by polyaluminum chloride(PAC),aluminum sulfate,iron sulfate was explored,the effects of pH,raw water turbidity,particle size and aging on MPs removal were investigated.The removal mechanism was analyzed.The results showed polyaluminum chloride has the best removal on PET and PVC,and the highest removal rate can reach 52.59％and 49.07％when the initial level of microplastics in water was 1.61×104 pcs/L.Charge neutralization was identi-fied as the dominant mechanism for microplastic removal.The removal rates of microplastics reached 51.70％at pH=7.0 and the increase of raw water turbidity promoted the removal efficiency of microplastics.for microplastics with a density greater than water,the larger the particle size,the better the removal efficiency.The aged microplastics were readily removed than raw microplastics.
万方数据
维普
