Spatiotemporal Distribution of Microplastics in Water Source and Treatment Process of a WTP
Microplastics usually refer to plastic solid particles with a particle size of less than 5 mm,insoluble in water,and persistent.This study collected samples from the water treatment process of the water treatment plant(WTP)and detected microplastics.Based on the detection results,a comparative analysis was conducted from three aspects:water purification process,different water sources,and different periods.The following conclusions had been drawn,the regularity of microplastic content in raw water was the dry season was more than the wet season,and the local reservoir water source was more than the South-to-North Water Diversion Project water source.Mainly influenced by human activities and seasonal characteristics.The water purification plant process of WTP had a good removal effect on microplastics,among which coagulation sedimentation had the best treatment effect.However,coagulants,disinfectants,and filter materials would pose a risk of introducing microplastics pollution,and further research was needed to verify their effectiveness.Within the range of 20～500 μm in particle size,the microplastic particle size in the water sources of the South-to-North Water Diversion Project was mainly concentrated in 20～50 μm,with very few microplastic particles larger than 100 μm;The particle size of microplastics suspected to be introduced by water purification agents was mainly 20～50 μm.Polybutylene succinate(PBS),polyethylene terephthalate(PET),and polyamide(PA)were found in the raw water samples collected at different water sources and periods in this study.When studying microplastic removal methods,special attention should be paid to the microplastics of these three components.The content of PBS microplastics was much higher than other components,and it was more easily removed by water purification processes.When there was fishing activity in the water source area,the content of PA microplastics may significantly increase.
microplasticswater treatment plant(WTP)water treatment processreservoir water sourcethe South-to-North Water Diversion Project
万方数据
维普
