改性木屑对初期雨水径流污染控制的性能研究  

Study on pollutants removal in the initial rainwater runoff with modified sawdust

作　　者：刘茵 张挺 王旭冕[3] 张建锋[3] LIU Yin;ZHANG Ting;WANG Xumian;ZHANG Jianfeng(Architectural Design and Research Institute,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China;Central and Southern China Municipal Eingineering Design&Ressearch Institute Co.Ltd.,Wuhan 430010,China;School of Environment and Municipal Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学建筑设计研究院 [2]中国市政工程中南设计研究总院有限公司,湖北武汉430010 [3]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2018年第5期730-734,共5页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家重点研发计划(2017YFC0403403-3/01)

摘　　要：城市绿地系统在储蓄雨水的同时净化水质,可以达到径流滞纳消峰和面源污染削减的双重功效,是目前国内海绵城市建设的重要内容之一.本文基于西安市城区屋面和路面降雨径流污染特征监测分析,利用改性木屑与土壤形成的复合基质来改良绿地系统,在提升绿地基层持水性能的同时强化其对初期雨水污染物的截留与消减.结果显示,屋面及道路前30min径流中COD、SS、TN浓度的衰减速度最大,后期污染物浓度稳定;与屋面比较,城市道路初期雨水污染物浓度较高,初期雨水含有污染物浓度占到整场降雨的65%以上;复合基质的持水量比原状土壤提高50%,复合基质对径流雨水中主要污染物有较好去除效果,去除率稳定在60%以上.研究表明采用改性木屑构造的复合基质作为绿地基层,对初期雨水径流有较好蓄存和净化效果.Unban green space system was promoted to reduce runoff and conta min ants widely,and enough attention was paid in Sponge City Strategy Planning which was launched in many Chinese urban city.Based on characteristics of rainfall and runoff pollutants at roofs and pavements in Xi′an a novel lawn treatment system with composite material basement of modified sawdust was designed to improve the capacity of water holding and pollutants removal.Results demonstrated that the rate of reduction of CODcr,SS,and TN content in the initial 30 min rainwater from roof and road were higher than the subsequent runoff process.Pollution concentrations in the rainwater runoff from road was higher than that from building roof,and concentrations of main pollutants in the initial rainwater account for 65%more than that in the entire rainfall;and the removal efficiency of improved lawn treatment system exceeded 60%for main conta min ants and heavy metal pollutants,and the holding water capacity was increased up to 30%.This research indicated that the improved lawn treatment system could be applied successfully for rainwater management and non-point source pollution control in the urban area.

关 键 词：城市绿地系统 改性木屑 持水量 径流污染控制 

分 类 号：TU998.9[建筑科学—市政工程]