摘要
以具有相同结构的两个多层介质水平潜流人工湿地为研究对象,考察了湿地单元进水、出水和植物根系附近的微塑料丰度、物理尺寸变化特征,并分析了湿地内部植物根系、湿地生物系统、悬浮物等去除微塑料的机理。结果表明,近年来在河道水质提升工程中常使用的较大粒径多层介质人工湿地能够有效降低天然河流水体中的微塑料丰度。在连续7 d的监测中,两个湿地单元对微塑料的平均去除率分别为26.91%和27.00%,最高分别达到了44.83%和44.59%。湿地单元对400~<800μm的微塑料去除率在20%~50%,而对800~<1200μm和≥1200μm的较大尺寸微塑料去除率可达到50%以上。湿地单元前部的植物根系对微塑料具有更明显的截留作用,且对≥800μm的较大尺寸微塑料截留效率更佳。人工湿地去除微塑料的效率可能与微塑料形状、湿地植物、水流速度、内部填料粒径及生物膜生长状况等多种因素有关。
In this study,two multilayer media horizontal subsurface flow constructed wetlands with the same structure were taken as the research objects,and the microplastic content and physical size variation characteristics of the influent and effluent of the wetland unit and the vicinity of plant roots were investigated.The mechanism of removing microplastic from plant roots,wetland biological systems,and suspended solids in wetlands was also analyzed.The results showed that the large particle size multilayer media constructed wetland commonly used in river water quality improvement projects in recent years could effectively reduce the abundance of microplastic in natural river water.During seven consecutive days of monitoring,the average removal rates of microplastic in the two wetland units were 26.91%and 27.00%,and the highest removal rates were 44.83%and 44.59%,respectively.The removal rate of microplastic in the wetland units for 400-<800μm was between 20%and 50%,and the removal rates of microplastic for large sizes of 800-<1200μm and≥1200μm were above 50%.The plant roots in the front of the wetland units had more obvious interception effect on microplastic,and the interception efficiency was better for larger microplastic≥800μm.The removal efficiency of microplastic in constructed wetlands might be related to the shape of microplastics,wetland plants,water flow rate,internal filler particle size,and biofilm growth.
作者
姚亮
张峰
贲睿
崔建国
YAO Liang;ZHANG Feng;BEN Rui;CUI Jianguo(School of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan Shanxi 030024)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2023年第2期199-205,共7页
Environmental Pollution & Control
关键词
多层介质
水平潜流人工湿地
微塑料
去除截留
multilayer media
horizontal subsurface flow constructed wetland
microplastic
removal and interception
作者简介
第一作者:姚亮,男,1996年生,硕士研究生,研究方向为水污染控制和城市水系统;通讯作者:张峰。
