[1]方燕,傅大康,李继红,等.雨污混接分流制区域河道水质与降雨事件的响应关系[J].中国给水排水,2021,37(7):107-113.
FANG Yan,FU Da-kang,LI Ji-hong,et al.Relationship between River Water Quality and Rainfall Events in Separate System with Mixing of Rainwater and Sewage[J].China Water & Wastewater,2021,37(7):107-113.
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FANG Yan,FU Da-kang,LI Ji-hong,et al.Relationship between River Water Quality and Rainfall Events in Separate System with Mixing of Rainwater and Sewage[J].China Water & Wastewater,2021,37(7):107-113.
雨污混接分流制区域河道水质与降雨事件的响应关系
中国给水排水[ISSN:1000-4062/CN:12-1073/TU]
卷:
第37卷
期数:
2021年第7期
页码:
107-113
栏目:
出版日期:
2021-04-01
- Title:
- Relationship between River Water Quality and Rainfall Events in Separate System with Mixing of Rainwater and Sewage
- 摘要:
- 雨污分流制区域存在雨污混接和地表径流污染，降雨仍然是影响河道水质波动的重要因素。以昆山高新区典型雨污分流制区域的大同中心河为研究对象，在连续一年监测河道水质和降雨量数据的基础上，分析了河道水质随降雨强度和降雨间歇期的变化规律。结果表明，河水水质波动幅度与24 h降雨量、降雨等级和降雨间歇期有关。当24 h降雨量<5 mm时，降雨后河水的COD浓度呈下降趋势；当24 h降雨量>5 mm时，降雨后河水的COD浓度总体较降雨前升高。降雨后河水氨氮浓度的变化受雨水冲刷和稀释的共同作用，当24 h降雨量<18 mm时，冲刷和稀释作用达到平衡；当24 h降雨量为18~22 mm时，稀释作用大于冲刷作用；当24 h降雨量>22 mm时，冲刷作用影响更加明显。随着降雨等级的增大，降雨后河水的氨氮浓度总体呈先增大后减小的趋势，小雨、中雨、大雨、暴雨后氨氮浓度的上升幅度分别为<0.2、0.3~0.5、0.4~0.7、0.7~1.0 mg/L；COD浓度一般先下降随后逐渐上升，且中雨和大雨时降雨径流稀释和管道沉积物冲刷的共同作用效应最为明显，一般在降雨后4 d左右COD浓度就缓慢上升，小雨、中雨、大雨、暴雨后COD浓度的下降幅度分别为2~4、5~9、7~10、>10 mg/L。另外，连续性降雨天气以及降雨间歇期过长都会导致降雨事件后河水中污染物浓度变化较大，当降雨间歇期为1 d时河水的COD和氨氮浓度变化幅度最大；当降雨间歇期为5 d时，河水的COD和氨氮浓度变化最不明显。
- Abstract:
- There are runoff pollution and mixing of rainwater and sewage in areas with separate system. Rainfall is still an important factor affecting the fluctuation of river water quality. Rainfall data and water quality of Datong Central River located in a typical area with separate system of Kunshan High-tech Zone were continuously monitored for one year, and variation in river water quality with rainfall intensity and rainfall interval was analyzed. Results indicated that the fluctuation of river water quality was related to rainfall in 24 hours, rainfall intensity and rainfall interval. When the rainfall in 24 hours was less than 5 mm, profile of COD in the river water after rainfall was decreasing. When the rainfall in 24 hours was more than 5 mm, COD of the river water after rainfall was generally higher than that before rainfall. Fluctuation of NH4+-N in the river water after the rainfall was related to the combined effect of erosion and dilution. The erosion and dilution effects were balanced when the rainfall in 24 hours was less than 18 mm, while the dilution effect was greater than the erosion effect when the rainfall in 24 hours was 18-22 mm. The erosion effect was more obvious when the rainfall in 24 hours was more than 22 mm. With the increase of rainfall grade, NH4+-N in the river water after rainfall increased firstly and then decreased, and the increasing ranges of NH4+-N after light rain, moderate rain, heavy rain and storm were <0.2 mg/L, 0.3-0.5 mg/L, 0.4-0.7 mg/L and 0.7-1.0 mg/L, respectively. Profile of COD generally decreased firstly and then increased gradually, and the combined effect of runoff dilution and pipeline sediment erosion was most obvious during moderate rain and heavy rain. Generally, COD rose slowly about 4 days after the rainfall, and the decreasing ranges of COD after light rain, moderate rain, heavy rain and storm were 2-4 mg/L, 5-9 mg/L, 7-10 mg/L and >10 mg/L, respectively. In addition, continuous rainfall events and excessive rainfall interval would result in a large fluctuation of pollutants concentration in the river water after rainfall events. The maximum fluctuation of COD and NH+4-N in river water occurred when the interval period was only one day, while the minimum fluctuation occurred when the interval period was five days.
相似文献/References:
[1]杨楠,张永森,张书晴,等.基于正交分析的河道水质达标边界条件研究[J].中国给水排水,2021,37(23):82.
YANG Nan,ZHANG Yong-sen,ZHANG Shu-qing,et al.Boundary Conditions of River Water Quality to Meet Surface Water Standard Based on Orthogonal Analysis[J].China Water & Wastewater,2021,37(7):82.
更新日期/Last Update:
2021-04-01