城市地表径流胶体对重金属下渗迁移行为的影响  

Effects of urban surface runoff colloid on infiltration and migration behavior of heavy metals

作　　者：杜晓丽[1,2] 梁卉 闫鑫瑞 崔申申 尹子杰 陈梦瑶 DU Xiaoli;LIANG Hui;YAN Xinrui;CUI Shenshen;YIN Zijie;CHEN Mengyao(Key Laboratory of Urban Stormwater System and Water Environment,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Advanced Innovation Center for Future Urban Design,Beijing 100044,China)

机构地区：[1]北京建筑大学城市雨水系统与水环境教育部重点实验室,北京100044 [2]北京未来城市设计高精尖创新中心,北京100044

出　　处：《水资源保护》2021年第1期118-123,131,共7页Water Resources Protection

基　　金：国家自然科学基金(51878024);北京市教委科研计划(KM201810016008);北京建筑大学科学研究基金(KYJJ2017030)。

摘　　要：为了解城市地表径流胶体对重金属在下渗设施中迁移行为的影响,提取道路雨水径流中的胶体,采用下渗柱试验研究了存在径流胶体时Cu^2+、Pb^2+和Cd^2+的下渗迁移出流质量浓度变化,分析进水流速、pH值、Na^+浓度、重金属离子共存和胶体粒径对胶体携带重金属迁移行为的影响。结果表明:径流胶体能够促进重金属离子的下渗迁移;进水流速越高,径流胶体对重金属离子的携带迁移作用越明显;弱酸性条件更有利于径流胶体对重金属离子的携带迁移;雨水径流中存在Na^+或多种重金属离子共存时,胶体携带重金属离子的下渗迁移过程会受到抑制,且离子浓度越大,其受抑制作用越明显;胶体粒径会显著影响径流胶体对重金属离子的携带迁移能力,胶体粒径越小,越容易携带重金属离子下渗迁移。To study the effects of urban surface runoff colloid on migration behavior of heavy metals in infiltration facilities,colloids in the road runoff were extracted and infiltration column experiment was employed to investigate the outflow mass concentration variation in infiltration and migration of Cu^2+,Pb^2+ and Cd^2+ under coexistence of runoff colloid.Besides,the influence of water flow rate,pH,sodium concentration,coexisting metal ions and colloid particle size on migration behavior of heavy metals carried by colloids were analyzed.The results show that the infiltration and migration of heavy metals were promoted by runoff colloids.The higher the water flow rate was,the carrying migration of heavy metals by runoff colloid was more obvious.Weak acid condition was more favorable to the carrying migration of heavy metals by runoff colloid.The infiltration and migration process of heavy metals carried by the colloid would be inhibited with the coexistence of Na^+ and various heavy metals in rainfall runoff.Besides,the higher the ion concentration was,the inhibition effect was more obvious.The colloid particle size could significantly affect the carrying capacity of heavy metals by runoff colloid where smaller colloid particle size contributed to easier infiltration and migration of heavy metals.

关 键 词：地表径流 胶体 重金属 下渗 迁移 

分 类 号：TV121.2[水利工程—水文学及水资源]