多水厂供水管网的供水分界带水质改善研究

Water quality improvement for mixed water supply boundary in a multi-waterworks water distribution system

多水厂供水管网存在供水分界带,小幅度调节水压差能使分界带波动。探究改变供水分界带区域地理位置,改善供水分界带水龄并保障整体管网水质安全,针对存在供水分界带的供水管网,对改善分界带水龄不同方案结果的比较,提出一种考虑用水节点分布与用水量的区域综合水龄评价方法。以H市供水管网为例,研究发现,根据评价方法,5种压差方案中,压差为2 mH_(2)O的方案,其分界带内与整体管网的相应水龄计算值均相对较小,说明该方案下水质相对最好。结果表明,控制不同水厂出厂压差,推移城市管网中的供水分界带,会使局部和整体水质区域性发生变化。确定压差方案时,区域综合水龄评价方法适用性好,能够对不同水质改善方案进行评估和比较择优。

Water supply from multiple waterworks will result in the presence of water supply boundary zone,and water pressure difference can make the boundary zone move.The geographical position can be changed,water age of the mixed zone can be reduced and water quality of the whole pipe network can be guaranteed by different schemes of adjusting the water pressure difference.Comparing the results of different schemes,a regional comprehensive water age(RCWA)evaluation method is proposed for the water distribution system,considering the distribution of water nodes and water demands,especially for the mixed zone.Taking H city as an example,the results show that according to the evaluation method,among the 5 schemes,the one with a discharge pressure difference of 2 mH_(2)O has relatively small calculated values both in the mixed zone and the overall pipe network,indicating that the water quality under this scheme is the best.Controlling the pressure difference of different water works will lead to the mixed zone moving in the network and regional and overall water quality changes.Moreover,when selecting a best case,RCWA evaluation method has good applicability and can be used to evaluate and compare different water quality improvement schemes.