城市降雨条件下生物滞留池对多环芳烃的削减效果研究  

Study on reduction effect of polycyclic aromatic hydrocarbons by bioretention ponds under urban rainfall conditions

作　　者：栾清华[1,2] 胡容京 暴瑞玲[1,2,3] 高成[1,2,3] 周宏[1,2,3] LUAN Qinghua;HU Rongjing;BAO Ruiling;GAO Cheng;ZHOU Hong(The National Key Laboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,China;Key Laboratory of Flood Disaster Prevention and Control of the Ministry of Emergency Management in China,Hohai University,Nanjing 210098,China;College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水灾害防御全国重点实验室,江苏南京210098 [2]河海大学洪涝灾害风险预警与防控应急管理部重点实验室,江苏南京210098 [3]河海大学水文水资源学院,江苏南京210098

出　　处：《水资源保护》2025年第2期12-18,29,共8页Water Resources Protection

基　　金：国家自然科学基金项目(52379008,42301015)。

摘　　要：为探究生物滞留池对城市降雨径流的多环芳烃面源污染的削减效果,构建了基于真实场景的生物滞留池,并设计了具有最不利条件的积水场景,以进出水条件为变量,对径流与介质接触时间、进水水深和壅水带深度等因素的影响进行了试验研究。结果表明:在无壅水带设置的情景下,高、中、低进水水深下多环芳烃的稳定去除率分别为71.2%、77.3%、81.4%,较低的进水水深有利于延长接触时间,提高削减效果;相同进水水深的条件下,随着壅水深度的增加及厌氧环境的形成,多环芳烃削减效果逐渐提高,相比于10 cm壅水带,60 cm壅水带条件下多环芳烃去除率提高了15.7%;多环芳烃的长期累积会导致介质饱和,在生物滞留池内多环芳烃累积量达280μg时,试验出现浸出效应,降低了削减效果。To investigate the effectiveness of bioretention ponds in mitigating polycyclic aromatic hydrocarbons(PAHs)pollution from urban rainfall runoff,a bioretention pond based on the real-world scenario was constructed.A water accumulation scenario with the most unfavorable conditions was designed,with influent and effluent conditions as variables.Experimental studies were conducted on the effect of contact time between runoff and media,influent water depth,and the depth of the backwater zone.The results showed that in the absence of a backwater zone,the stable removal rates of PAHs under high,medium,and low influent water depths were 71.2%,77.3%,and 81.4%,respectively.A lower influent water depth was beneficial for extending the contact time and improving the removal efficiency.Under the same influent water depth,as the backwater depth increased and an anaerobic environment formed,the removal efficiency of PAHs gradually improved.Compared to a 10 cm backwater zone,the PAHs removal rate increased by 15.7% under a 60 cm backwater zone.Long-term accumulation of PAHs can lead to media saturation.When the cumulative amount of PAHs in the bioretention pond reached 280μg,leaching effects were observed in the experiment,reducing the removal efficiency.

关 键 词：多环芳烃 生物滞留池 城市降雨径流 面源污染 削减效果 

分 类 号：P343[天文地球—水文科学]