双水源对置供水管网中三卤甲烷变化规律浅析

Analysis on Change Law of Trihalomethane in Dual-source Water Supply Networks

为有效控制供水管网中的三卤甲烷浓度,考察了以太湖和阳澄湖为双水源的管网水中三卤甲烷的变化趋势。采集S市分别经过A水厂(以太湖为水源)和B水厂(以阳澄湖为水源)处理后的供水管网水样,探讨三卤甲烷和余氯浓度随供水距离的变化规律,并进行了三卤甲烷-余氯和三卤甲烷-供水距离的线性回归分析。结果表明,在A、B水厂单独供水管网中,三卤甲烷随供水距离的增加而升高,余氯浓度随供水距离的增加而降低;在A、B水厂同时供水的对置供水管网中,三卤甲烷浓度由A水厂到B水厂呈现先升高后降低的变化规律,而余氯浓度则呈现先降低后增加的变化规律,对置供水管网中10 km处为水力交接点,此处余氯浓度最低,三卤甲烷浓度最高。经线性回归分析发现,三卤甲烷浓度与余氯浓度和供水距离之间存在显著的相关性,并且温度对模型的影响较大。

Profile of trihalomethane in water supply networks with dual sources(Taihu Lake and Yangcheng Lake) was explored.Water samples from water supply system of S city after treatment by waterworks A(Taihu Lake water as source water) and B(Yangcheng Lake water as source water) were collected respectively,the changes of trihalomethane and residual chlorine with water supply distance were discussed,and the linear regressions of trihalomethane-residual chlorine and trihalomethane-water supply distance were analyzed.In the separate water supply network of waterworks A and B,the concentration of trihalomethane increased and the residual chlorine decreased with the increase of water supply distance.In water supply network supplied simultaneously by waterworks A and B,the concentration of trihalomethane increased first and then decreased from waterworks A to waterworks B,while the residual chlorine decreased first and then increased.At hydraulic junction point located at 10 km in the water supply network,the residual chlorine was the lowest and the trihalomethane concentration was the highest.Linear regression analysis showed that there was a significant correlation between the concentration of trihalomethane and residual chlorine/water supply distance,and temperature had a great influence on the model.