Application of thermal mixing on sewer pipe inspection in high flows

土地利用和气候的持续变化表明，由于峰值径流和洪水事件的增加，传统的废水系统将承受额外的负荷。此外，大多数污水处理系统都是在快速增长期建成的，现在需要进行持续的状况评估。卫生下水道系统是市政资本投资预算和年度运营预算的重要组成部分。桑德贝市负责对约500公里的污水管网进行状况评估。传统的状态评估方法，如实施闭路电视（CCTV），是非常劳动密集型和昂贵的。桑德贝市正在投资于实际的研究项目，寻找易于更新和具有成本效益的监测系统，以获取有关废水收集系统的质量和老化的信息。本提案旨在进行实验室实验，以进行热成像的灵敏度分析，并使用热传感器对使用无线技术的废水收集系统进行状态评估。热成像技术提出了使用传统的温度传感器和新兴的热成像相机。在这个项目中，将开发一种新颖的、独立的无线数据收集系统，以大大降低管道评估的成本。采用冬季模型，污水平均温度约为25度，地下水约为3度，数据采集单元可以使用灵敏的温度计直接测量水温，并可以使用灵敏的红外摄像机记录热图像，以识别水流渗透的位置和大小。利用热混合理论对现场试验中各操作单元的监测数据进行验证。该研究项目的成果将为桑德贝市和加拿大其他市政当局提供一个经过验证的综合无绳装置，可以有效地监测地下下水道系统中管道的现有状况。

Ongoing changes in land use and climate have shown that conventional wastewater systems will receive additional loading due to increased peak runoff and flooding events. In addition, the majority of wastewater systems were built during a rapid growth period and now require a continuous condition assessment. Sanitary sewer systems are a significant portion of a municipality's capital investment budget and annual operating budget. The City of Thunder Bay is responsible for conducting condition assessment of around 500 km of a sewer pipeline network. Conventional condition assessment methods like implementing closed circuit television (CCTV) are very labor intensive and expensive. The City of Thunder Bay is investing in practical research projects to find easily updated and cost-effective monitoring systems to acquire information about the quality and ageing of wastewater collection systems. The present proposal aims to conduct laboratory experiments to perform sensitivity analysis of thermography and using thermal sensors for condition assessment of wastewater collection systems using wireless technology. Thermal mapping techniques are proposed using both conventional temperature sensors and emerging thermal imaging cameras. In this project, a novel, self-contained wireless data collection system will be developed to dramatically reduce the costs of pipe assessment. Using a winter season model, where the average temperature of wastewater is around 25 degrees and underground water is approximately 3 degrees, data collection units can directly measure water temperature using a sensitive thermometer, and can record thermal images using sensitive infrared cameras to identify the position and magnitude of flow infiltration. The monitoring data from the operational units in the field testing will be validated with the thermal mixing theory. The outcome of this research project will offer the City of Thunder Bay and other municipalities in Canada a validated, integrated tether-less unit that can efficiently monitor the existing condition of pipelines in underground sewer systems.