华北某再生水管网余氯衰减分析及影响因素研究

Analysis of residual chlorine decay in a reclaimed water pipe network in North China and study on its influencing factors

针对华北某市再生水管网余氯衰减趋势及变化规律展开研究。采用EPANET软件对该区域再生水管网余氯衰减进行了水力水质模拟,得到了该管网的余氯分布情况,并通过实际管网取样检测验证了模型模拟的精确度。对实际管网多个水质指标进行取样检测,分析了各指标对余氯衰减的影响。余氯在夏季衰减更剧烈,水温、管道浊度是余氯衰减的重要影响因素,管网p H值变化不大,其对余氯衰减的影响不大,TOC与余氯衰减的关系较复杂,余氯衰减速度和管网流速呈现正相关关系,且管壁对余氯衰减的作用不可忽视。

The research on residual chlorine decay tendency and change rules of a reclaimed water pipe network of a city located in North China were carried out. Using EPANET software to simulate the hydraulic power and water quality of residual chlorine decay in the reclaimed water pipe network of the said district, the distribution situation of residual chlorine was gotten, and the accuracy of the model simulation was verified through detecting the water samples taken from actual pipe network. Many quality indicators of water samples taken from actual pipe network were detected, and the effect of all those indicators on residual chlorine decay were analyzed. The residual chlorine decays faster in summer, water temperature and turbidity of pipeline were important influencing factors of residual chlorine decay. The pH value of pipe network changes little and has lit- tle effect on residual chlorine decay. The relationship between TOC and residual chlorine decay was complex; the residual chlorine decay rate had a positive correlation with pipe network flow rate and the effect of tube wall on residual chloride decay could not be ignored.