城市供水管网通水初期水质变化规律研究  

Water Quality Variation in Initial Stage of Urban Water Supply Network

作　　者：刘东坡 张金松[1,2] 靳军涛 LIU Dong-po;ZHANG Jin-song;JIN Jun-tao(Shenzhen Water Co. Ltd.,Shenzhen 518035,China;School of Civil Engineering,Guangzhou University,Guangzhou 510006,China;Cooperative Research and Education Center for Environmental Technologyy Tsinghua University and Kyoto University,Shenzhen 518055,China)

机构地区：[1]深圳市水务<集团>有限公司,广东深圳518035 [2]广州大学土木工程学院,广东广州510006 [3]清华-京大环境技术联合研究与教育中心,广东深圳518055

出　　处：《中国给水排水》2019年第17期43-49,共7页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07501002)

摘　　要：针对城市供水管网通水初期水质不稳定引起客户投诉的问题,以球墨铸铁管、不绣钢管和HDPE管为研究对象,以南方某水厂的出厂水为进水,模拟了供水管网通水初期的运行情况。通过监测管道内水质、颗粒物粒径分布及管垢组分,对比分析了3种管材运行过程中水质及管壁界面的变化和交互作用特征。结果表明,球墨铸铁管运行过程中水质变化最大,pH值始终高于8.0、色度最高达到10度、余氯衰减明显,而不锈钢管和HDPE管各项水质参数运行前期变化较大,后期逐渐趋于稳定。管道内壁扫描电镜和能量质谱仪测试结果表明,各管段内壁微观形貌和元素组成有显著性差异,球墨铸铁管内部微观形貌在运行期间由疏松多孔的颗粒状逐渐变为相对致密的不规则立体状,且O、Ca含量最多;运行14d时不锈钢管内壁出现大小不均的瘤状物,25d时内壁光滑且瘤状物减少,元素组成以Fe、Cr为主;HDPE管运行前内壁有细小的穿孔,运行14d时穿孔明显变大,25d时表面粗糙呈鳞片狀,元素组成以C、O为主。To investigate the fluctuation of water quality after new water mains were put into service,ductile iron pipe,stainless steel pipe and HDPE pipe were used as water mains in a continuous simulation to transfer effluent from a watenvorks in southern China.Through monitoring the water quality parameters,particle size distributions and scale components,the variation of the water quality and the inner wall of the pipelines,as well as the interactions between water and pipe,were analyzed and compared.The results showed that the pH value was always higher than 8.0 for the ductile iron pipe,the color was up to 10 degrees,and the residual chlorine decreased significantly.For the stainless steel pipe and the HDPE pipe,the water quality parameters were changed considerably in early stage,and were gradually stabilized later.Analyses of the inner wall with scanning electron microscope and energy dispersive spectroscopy revealed significant differences in the micro-morphology and elemental composition of the three pipe materials.The micro-morphology of the ductile iron pipe gradually changed from loose porous granular to relatively dense irregular surface during the operation,O and Ca were the main elements.The micro-morphology of stainless steel pipe showed uneven tubercles on the 14th day,but showed smooth wall and less tubercle on the 25th day,and its main elements were Fe and Cr.HDPE pipe had small perforations before the tests,and the perforations were enlarged on the 14th day,the surface became rough and scaly on the 25th day,and its main elements were C and O.

关 键 词：城市供水管网 通水初期 水质变化 管道更新 管材 管壁腐蚀 

分 类 号：TU991[建筑科学—市政工程]