Department of Municipal Engineering, Hefei University of Technology, Hefei 230009, China E-mail:
School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China.
Water Sci Technol. 2022 Jan;85(2):633-644. doi: 10.2166/wst.2021.625.
In recent years, three simple tracers (conductivity, turbidity and temperature) have shown their advantages to many other tracers for tracing and assessment of extraneous water (or inflow and infiltration, I/I) into sewer systems due to low detection cost and high monitoring frequency. A better understanding of the error and uncertainty of the three simple tracers on the quantification of I/I will help to improve the reliability and reduce the cost of actual projects. A large-scale experimental model simulating a 36 m long sewer was constructed for conducting extraneous water flow tests including groundwater infiltration, wastewater inflow and hot water inflow under different I/I flow rates and concentrations. The accuracy and uncertainty of the three tracers were estimated, and their correlation with tracer concentration difference before and after extraneous inflow was also analyzed. Experimental results provide guidance for the practical applicability of the three tracers under different I/I conditions.
近年来，由于检测成本低、监测频率高，三种简单示踪剂（电导率、浊度和温度）在示踪和评估污水系统外来水（或入流和入渗，I/I）方面表现出优于许多其他示踪剂的优势。更好地了解三种简单示踪剂在量化 I/I 方面的误差和不确定性，有助于提高实际项目的可靠性和降低成本。为了进行包括地下水入渗、污水入流和热水入流在内的外来水流测试，构建了一个模拟 36 米长下水道的大型实验模型。对三种示踪剂的准确性和不确定性进行了评估，并分析了它们与外来入流前后示踪剂浓度差的相关性。实验结果为三种示踪剂在不同 I/I 条件下的实际适用性提供了指导。
