典型南方地区城市供水管网水质状况分析

Analysis of Water Quality Status of Water Supply Network in Typical Areas in Southern China

对2013年南方某城市供水管网各采样点数据进行整理,根据管网的拓扑结构选取其中具有代表性的14个采样点进行水质调查分析,阐明该区管网的水质现状。分析所选用的水质因子为浊度、余氯、p H、耗氧量和菌落总数,并采用Pearson和Spearman相关性分析法进行分析。结果表明不同采样点水样的浊度、p H和耗氧量相差不大,而余氯则与菌落总数呈显著的负相关关系;耗氧量季节性变化最明显,与水温呈显著地负相关关系;管网中水的p H受原水p H影响,呈折线下降趋势;管网末梢与供水交界区域水质稳定性差,需加强监控。

After collecting data on water quality of monitoring points in water supply network in a certain southern city of China and doing water quality analysis of 14 monitoring points that are selected based on topology of the network, this paper will expound the current situation of water quality in Nanhai. Turbidity, residual chlorine, pH, oxygen consumption as well as standard plate-count bacteria are used as water quality genes and Pearson and Spearman correlation analysis are adopted. The result shows that there is little difference in Turbidity, pH, oxygen consumption among different points and a prominent negative correlation between residual chlorine and standard plate-count bacteria. Oxygen consumption correlates with water temperature negatively, pH of water samples is mainly affected by pH of raw water and it has a downtrend. Water in peripheral and junctional zone of the network is unstable in quality, so it needs to be improved.