生物滞留池对屋面径流基本污染物的控制  

Control of basic pollutants in roof runoff by bioretention cells

作　　者：毛月鹏 汪志荣[1] 史怡然 杨巧 潘声远 MAO Yuepeng;WANG Zhirong;SHI Yiran;YANG Qiao;PAN Shengyuan(School of Environmental Science and Safety Engineering,Tianjin University of Technology,Tianjin 300384)

机构地区：[1]天津理工大学环境科学与安全工程学院

出　　处：《环境污染与防治》2020年第1期29-34,共6页Environmental Pollution & Control

基　　金：天津市科技计划项目（No.16YDLJSF00030）;天津市自然科学基金重点项目（No.18JCZDJC39600）

摘　　要：快速的城市化导致不透水性下垫面急剧增加,进而加剧了径流污染,尤其是屋面径流污染。生物滞留池作为低影响开发理念的核心措施之一,对径流的净化效果显著。以屋面径流为控制对象,设计了3个生物滞留池用于探究不同土壤层厚度和不同进水方式对生物滞留池出水的影响。结果表明,实验收集的屋面径流污染严重,COD和TN为《地表水环境质量标准》(GB 3838-2002)劣Ⅴ类。经生物滞留池处理后发现,3个生物滞留池对悬浮物(SS)的去除效果较好,去除率为92.2%~98.7%,装填20cm土壤的表层进水生物滞留池较装填15cm土壤的生物滞留池出水污染物浓度低。装填20cm土壤的表层进水和侧向进水的生物滞留池对COD、TN和TP的去除能力总体相当,表层进水和侧向进水的生物滞留池对COD的去除率分别为91.7%、90.4%,对TN的去除率分别为93.8%、86.5%,对TP的去除率分别为70.1%和72.7%。Rapid urbanization has resulted in a sharp increase in impervious underlying surfaces,which in turn has increased runoff pollution,especially roof runoff pollution.As one of the core measures of the low impact development concept,the bioretention cell has a significant purification effect on runoff.In this paper,three bioretention cells were designed with roof runoff as the control object to explore the effects of different soil heights and different influent modes on the effluent of bioretention cells.The results showed that the roof runoff collected in the experiment was seriously polluted.The COD and TN in the water quality index were worse than"Environmental quality standards for surface water"(GB 3838-2002)Grade Ⅴ.Three bioretention cells had better removal performance of SS,and the removal rate ranged from 92.2% to 98.7%.Pollutant concentrations of effluent from bioretention cell with 20 cm soil and surface inflow were lower than those with 15 cm soil.The removal capacities of COD,TN and TP by the bioretention cells with surface and lateral inflow were generally equivalent.The removal rates of COD by the bioretention cells with surface and lateral inflow were 91.7% and 90.4%,respectively.The removal rates of TN were 93.8% and 86.5%,and the removal rates of TP were 70.1% and 72.7%,respectively.

关 键 词：生物滞留池 屋面径流污染 低影响开发 

分 类 号：TU985.12[建筑科学—城市规划与设计] X52[环境科学与工程—环境工程]