摘要
为了解迁安市典型道路下垫面的径流污染特征,通过人工降雨试验手段分别监测1、2、3年一遇重现期条件下的道路径流污染情况,并对径流中SS、NH3-N、TN、COD及TP的排放特征,单次降雨径流平均浓度(EMC)及相关性进行分析。结果表明,各项径流污染物浓度在设计降雨量为4~5 mm时达到峰值,此后浓度逐渐降低,并于10~15 mm时趋于平稳,前15 mm降雨是迁安市降雨径流污染的最佳控制阶段。道路径流中SS、NH3-N、TN、COD及TP的EMC值分别为36~39、0.47~0.61、4.71~9.51、43~54、0.18~0.23 mg/L,其中COD及TN浓度超过了《地表水环境质量标准》(GB 3838—2002)的Ⅴ类标准限值,是路面径流的主要污染物;SS浓度与其他4个指标浓度均可呈现良好的正相关关系,以SS作为迁安道路下垫面典型径流污染指标,分析得出径流SS控制率与设计降雨量的关系,可为基于水环境污染控制目的的道路海绵城市建设过程中设计降雨量的确定提供参考。
In order to understand the characteristics of typical urban road underlying surface runoff pollution in Qian’an City,the road runoff pollution with return period of 1,2 and 3 years was monitored by artificial rainfall test,and discharge characteristics,event mean concentration(EMC)and correlation of SS,NH3-N,TN,COD and TP in runoff were analyzed.Concentration of various runoff pollutants peaked when the designed rainfall was 4-5 mm.After that,the concentration gradually decreased and stabilized when the rainfall was 10-15 mm,indicating that the first 15 mm rainfall was the best stage for runoff pollution treatment in Qian’an City.EMCs of SS,NH3-N,TN,COD and TP in the road runoff were 36-39 mg/L,0.47-0.61 mg/L,4.71-9.51 mg/L,43-54 mg/L and 0.18-0.23 mg/L,respectively.Among them,the concentrations of COD and TN exceeded the classⅤstandard limitation specified in Environmental Quality Standards for Surface Water(GB 3838-2002),which were the main road runoff pollutants.The concentration of SS had a good positive correction with the concentrations of NH3-N,TN,COD and TP.Based on this,SS was selected to be the typical road runoff pollutant in Qian’an City,and the relationship between control ratio of SS in runoff and designed rainfall was analyzed.The results could provide reference for the determination of designed rainfall in the process of road sponge city construction based on water environment pollution control.
作者
李曼
曲直
刘佩勇
李皓翔
赵轩
杜家慧
薛祥山
LI Man;QU Zhi;LIU Pei-yong;LI Hao-xiang;ZHAO Xuan;DU Jia-hui;XUE Xiang-shan(Tsinghua Holdings Human Settlements Environment Institute,Beijing 100083,China;Beijing Branch,Shenzhen Huakong Seg Co.Ltd.,Beijing 100081,China;China Construction Third Engineering Bureau Co.Ltd.,Beijing 100097,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2020年第21期110-114,共5页
China Water & Wastewater
关键词
道路径流污染
面源污染控制
人工降雨试验
海绵城市
road runoff pollution
non-point source pollution control
artificial rainfall test
sponge city
