生物滞留带中轮胎磨损颗粒的理化特性

Physicochemical Properties of Tire Wear Particles in Bioretention Zone

近年来,由于市场机动车保有量迅速提升,轮胎磨损颗粒(tire wear particles, TWP)逐渐进入人们的视野。然而,中国针对TWP的研究才刚起步,典型海绵设施生物滞留带能否有效截留TWP尚不清楚。以重庆市渝北区悦来生态城为研究区域,采集生物滞留带土壤样本,提取TWP并采用扫描电子显微镜(scanning electron microscope, SEM)、能量分散X光谱仪(energy dispersive spectrometer, EDS)、红外光谱、热失重、土壤重金属测定仪和粒度仪对生物滞留带中TWP的理化特性进行分析。结果表明:TWP为不规则块状、球状及长条状。Si是TWP中含量较高的元素,Zn含量整体相对较低。表层土壤相较中层和底层土壤提取出的TWP混合物质量比较高且热失重变化较大。在100、250~400、400~550℃存在明显质量变化。TWP混合物尺寸分布在13.11~116.1μm,平均粒径为68.62μm。

In recent years,due to the rapid increase in the number of motor vehicles in the market,tire wear particles(TWP)have gradually come into peoples view.However,the domestic research on TWP has just started,and it is still unclear whether the typical sponge facility,biological retention zone,can effectively trap TWP.Yuelai Ecological City,Yubei District of Chongqing was selected as the research area,and soil samples of biological holdup zone were collected,TWP was extracted,and TWP in biological holdup zone was analyzed by scanning electron microscope(SEM),energy dispersive spectrometer(EDS),infrared spectroscopy,thermogravimetry,soil heavy metal analyzer and particle size analyzer.The results show that TWP is irregular block,ball and long strip.Si is a relatively high content element in TWP,while Zn content is relatively low overall.The weight of the TWP mixture extracted from the surface soil is higher than that from the middle soil and the bottom soil,and the change of thermal weight is relatively large.There are obvious weight changes around 100,250~400,400~550℃.The size distribution of TWP mixture is 13.11~116.1μm,the average particle size is 68.62μm.