Wang Jun, Bi Chun-juan, Chen Zhen-lou, Zhou Dong
Key Laboratory of Geographic Information Science of the Ministry of Education, School of Resources and Environmental Science, East China Normal University, Shanghai 200241, China.
Huan Jing Ke Xue. 2013 May;34(5):1735-44.
Four typical rainfalls were monitored in two different research areas of Wenzhou Municipality. Concentrations of BOD5 and COD in six different urban runoffs were measured. In addition the event mean concentration (EMC), M (V) curve and BOD5/COD of pollutant were calculated. The results showed that concentrations of BOD5 and COD in different urban runoffs of Wenzhou ranged from ND to 69.21 mg x L(-1) and ND to 636 mg x L(-1). Concentrations of BOD5 and COD in different urban runoffs were decreasing over time, so it is greatly significant to manage the initial runoff for reducing organic pollution. Judged by EMC of BOD5 and COD in these five rainfalls, concentrations of pollutant in some urban runoffs were out of the integrated wastewater discharge standard. If these runoffs flowed into river, it would cause environmental pressure to the next level receiving water bodies. According to the M (V) curve, the first flush effect of COD in most urban runoffs was common; while the first flush effect of BOD5 was same as that of COD. The result also showed that organic pollution was serious at the beginning of runoff. The underlying surface type could affect the concentration of BOD5 and COD in urban runoff. While the results of BOD5/COD also suggested that biodegradation was considered as one of the effective ways to decrease the pollution load of organics in urban runoff, and the best management plans (BMPs) should be selected for various urban runoff types for the treatment of organic pollution.
在温州市的两个不同研究区域监测了4场典型降雨。测定了6种不同城市径流中生化需氧量（BOD5）和化学需氧量（COD）的浓度。此外，还计算了污染物的事件平均浓度（EMC）、M（V）曲线以及BOD5/COD。结果表明，温州市不同城市径流中BOD5和COD的浓度范围分别为未检出（ND）至69.21 mg·L⁻¹以及ND至636 mg·L⁻¹。不同城市径流中BOD5和COD的浓度随时间下降，因此管理初期径流对于减少有机污染具有重要意义。根据这5场降雨的BOD5和COD的EMC判断，一些城市径流中的污染物浓度超出了综合废水排放标准。如果这些径流流入河流，将对下一级受纳水体造成环境压力。根据M（V）曲线，大多数城市径流中COD的初期冲刷效应普遍存在；而BOD5的初期冲刷效应与COD相同。结果还表明，径流开始时有机污染严重。地表类型会影响城市径流中BOD5和COD的浓度。而BOD5/COD的结果也表明，生物降解被认为是降低城市径流中有机污染物负荷的有效方法之一，应针对不同类型的城市径流选择最佳管理方案（BMPs）来处理有机污染。
