河道护坡湿地类型对雨天溢流污染物去除特性  

Characteristics of Overflow Pollutants Removal by Wetland Types of River Revetment in Rainy Days

作　　者：祝超逸 李怀正[1] ZHU Chaoyi;LI Huaizheng(College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学环境科学与工程学院,上海200092

出　　处：《净水技术》2023年第5期122-130,共9页Water Purification Technology

基　　金：长江生态环境保护修复联合研究项目(第一期)(2019-LHYJ-01-0212-14);中国长江三峡集团有限公司资助项目(202003065)。

摘　　要：近年来城市河道面临雨天反复污染问题,泵站雨天溢流是影响城市河流水质稳定达标的重要原因。结合河道护坡地形,将潜流人工湿地构造为护坡湿地,研究不同运行工况和进出水构造条件下湿地对污染物的去除效果并分析去除机理。结果表明,护坡湿地在垂直流工况下,进水管水平长度为3.6 m(占污水处理区水平长度的90%),出水管高度为0.65 m(占污水处理区高度的81.25%)为最优进出水构造,在该进出水构造下湿地对COD_(Cr)、氨氮、TN、TP的去除率分别为45.0%、91.5%、42.6%、44.3%。护坡湿地按水平流工况运行时,对各项污染物的去除率低于垂直流工况,但去除负荷有显著提升。在同时设置底部和出水高度处集水的最优出水构造下,护坡湿地对COD_(Cr)、氨氮、TN、TP的去除负荷分别为103.0、46.79、15.64、0.41 g/(m^(2)·d)。In recent years,urban rivers have faced repeated pollution problems in rainy days.The overflow of pumping stations is an important reason for affecting the stability of river water quality.By combining river revetment and subsurface flow constructed wetland to construct revetment wetland,the removal effect of wetland on pollutants under different operating conditions and inlet and outlet water structure conditions was studied and the reaction mechanism was analyzed.The results showed that under the vertical flow condition,the horizontal length of the inlet pipe was 3.6 m(accounting for 90%of the horizontal length of the wastewater treatment area)and the height of the outlet pipe was 0.65 m(accounting for 81.25%of the height of the wastewater treatment area)was the optimal inlet and outlet structure.The removal rates of CODCr,ammonia nitrogen,TN and TP were 45.0%,91.5%,42.6%and 44.3%,respectively.When the revetment wetland was operated under horizontal flow conditions,the removal rate of pollutants was lower than that under vertical flow conditions,but the removal load was significantly improved.Under the optimal outlet structure of collecting water at the bottom and outlet height at the same time,the removal loads of CODCr,ammonia nitrogen,TN and TP were 103.0,46.79,15.64,0.41 g/(m2·d),respectively.

关 键 词：生态护坡 人工湿地 泵站溢流 溢流污染 进出水结构 

分 类 号：TU992[建筑科学—市政工程]