河道综合治理后城市水体沉积物中微塑料污染特征研究--以汾河太原城区段为例

Study on the characteristics of microplastics pollution in urban water sediments after comprehensive regulation of rivers:taking the Taiyuan section of Fenhe River as an example

以先后经过3期综合整治工程(包括截污纳管、湿地营建、滨河景观建设等)的汾河太原城区段为研究对象,对其沉积物中微塑料进行了研究。结果表明:汾河太原城区段沉积物中微塑料丰度为108~732个/kg,上游未经河道治理的采样点丰度最高,河道综合治理后微塑料丰度明显下降;白色(35%)在所有微塑料颜色中占比(数量占比,下同)最大,经过湿地营建工程治理后黄色微塑料占比增多;纤维状微塑料(61%)是沉积物中微塑料的主要形态;<1000μm的微塑料占比为63%;人造丝(23%)、聚酯纤维(21%)等成分在所有检出的聚合物类型中占比居前;综合治理工程对微塑料的丰度、颜色、形状、成分有着不同的影响。

The microplastics in the sediments of the Taiyuan section of the Fenhe River,which had undergone three phases of comprehensive regulation projects(sewage interception pipes,wetland construction,riverside landscape,etc),were used as the research object.The results showed that the abundance of microplastics in the sediments of the Taiyuan section of the Fenhe River was 108-732 piece/kg,and the abundance of sampling points without river regulation in the upstream was the highest.The abundance of microplastics in the river course decreased significantly after comprehensive treatment.White microplastics(35%)accounted for the largest proportion of all microplastics.After the treatment of wetland construction projects,the proportion of yellow microplastics increased.Fibrous microplastics(61%)were the main form of microplastics in the sediments of the Taiyuan section of the Fen River.Microplastics smaller than 1000μm accounted for 63%of all microplastics.Rayon(23%),polyester fiber(21%)and other ingredients accounted for the highest proportion of the detected polymer types.Different comprehensive regulation projects had different effects on the abundance,color,shape,and composition of microplastics.