城市地表径流胶体与溶解性有机物下渗共迁移行为
Co-migration behavior between colloids and dissolved organic matter from urban surface runoff
杜晓丽 1荆文会 2刘殿威 2匙中文 2付霄宇2
作者信息
- 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;北京节能减排与城乡可持续发展省部共建协同创新中心,北京,100044
- 2. 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
- 折叠
摘要
针对城市地表径流胶体与溶解性有机物(DOM)共存特性,考察下渗柱中径流胶体和DOM的出流浓度,分析进水流速、pH值、离子强度和胶体粒径变化时城市地表径流胶体与DOM的共下渗迁移行为.结果表明,径流胶体与DOM结合后,会显著促进对方向下迁移;进水流速越高,径流胶体对DOM的携带迁移越明显,两者的出流浓度越高;进水流速为10mL·min-1时,径流胶体和DOM的穿透曲线相对峰值浓度分别比5 mL·min-1时提高了 3.5％、8.1％;径流胶体-DOM混合溶液在pH值为6时的下渗共迁移速度最快;Na+存在抑制了径流胶体与DOM的下渗共迁移;共存地表径流胶体粒径越小,DOM的下渗出流时间越早、出流峰值浓度越低.
Abstract
Aiming at the coexistence of colloids and dissolved organic matter(DOM)from urban surface runoff,the concentrations of runoff colloids and DOM in effluent from the infiltration column were investigated.Besides,the influence of water flow velocity,pH values,Na+concentration and particle size of colloids on the co-migration behavior between colloids and dissolved organic matter were analyzed.The results showed that the combination between runoff colloids and DOM significantly promoted their downward migration.The concentrations of runoff colloid and DOM in effluent were much higher when the influent velocity was higher.Compared to the influent velocity of 5 mL·min-1,the relative peak concentrations of the colloids and DOM in effluent were increased by 3.5％and 8.1％under the condition of the influent velocity of 10 mL·min-1,respectively.The co-migration speed of the runoff colloids and DOM was the fastest at pH value of 6.The downward co-migration of runoff colloids and DOM was inhibited by the presence of Na+.The smaller the particle size of coexisting runoff colloids,the earlier the outflow time of DOM and the lower the peak concentration of DOM in effluent.
关键词
地表径流/胶体/溶解性有机物/下渗/共迁移Key words
runoff/colloids/dissolved organic matter/infiltration/co-migration引用本文复制引用
基金项目
国家自然科学基金(51878024)
北京建筑大学金字塔人才培养工程(JDJQ20200302)
出版年
2024
NETL
NSTL
万方数据