给水管网对黄河水源水质的适应性研究

Study on Adaptability of Water Distribution Network to Yellow River Source Water

为了考察北方某市水源切换为黄河水源后管网的适应性等问题,采集了当地3处典型供水区域管段搭建管网模拟系统进行水源切换试验。地下水厂供水区域、地表水厂管网前端、地表水厂管网末梢等3处管段试验结果表明,历史水源水质、管道在供水管网中所处位置共同影响着管道中的溶解氧和消毒剂浓度,继而影响水的氧化还原电位。地表水条件下形成的管垢相对较稳定,而地下水条件下所形成的管垢稳定性相对较差;同为地表水条件下的管垢,与处于供水管网末端的管段相比,处于前端的管段更为稳定。切换为黄河水源后,3处管段会出现不同程度的"黄水",地表水区域管段适应期较短,地下水区域管段适应期较长。

To study the adaptability of the water distribution network in a city in northern China to diverted Yellow River source water, a simulated switch of water source was conducted in a water distribu- tion system built with three pipes in locally typical water supply areas including groundwater supply area and the initial and terminal sections of surface water supply area. Both original water source and the loca- tion of pipes in the water distribution network affected the levels of DO and disinfectant in pipes and, cor- respondingly, water＇ s oxidation reduction potential. The pipe scale formed under the condition of surface water was relatively stable, while the stability of pipe scale formed under the condition of groundwater was relatively poor. In addition, for pipes from surface water supply area, the pipe scale in the initial section showed higher stability than that in the terminal section. After the switch to Yellow River source water, ＂red water＂ occurred in all pipes to various extents. In comparison to pipes in surface water supply area, the pipe from groundwater supply area was associated with longer adaptation period.