给水管网铸铁管道的管垢组成与通水水质特征的关系

发布时间：2018-11-23 12:24

【摘要】：采集了北方某市给水管网中不同通水水源的铸铁管段管垢样品,利用统计方法分析了管垢主要铁氧化物晶体与水质参数之间的关系,同时比较了不同水源水质条件下管垢中微量无机元素的差异。管垢中最主要的铁氧化物为α-Fe OOH(针铁矿)、Fe3O4(磁铁矿)和γ-Fe OOH(纤铁矿)。α-Fe OOH的含量与所通水的碱度和钙硬度显著正相关,Fe3O4与水的拉森指数显著正相关,而γ-Fe OOH与所分析的水质参数均无显著相关性。在管垢样品中,利用X射线荧光光谱共检测到40种无机元素,其中普遍检出且含量相对较高的无机元素有Fe、Si、Al、Ca、S、Cl,在半数以上的样品中还检出了V、Ti、Mo、La、Cr、Zn、Sr、Ta、Ni等微量金属元素。通地下水的管垢中Al和Ba的含量比通地表水的管垢高,而通地表水管垢中Mo和Ni的含量比通地下水的管垢高,不同通水水源的管垢中Zn和Cu两种元素的含量差别不大。
[Abstract]:The scale samples of cast iron pipe in different water sources of water supply network in a northern city were collected, and the relationship between the main iron oxide crystals and water quality parameters was analyzed by statistical method. At the same time, the differences of trace inorganic elements in pipe scale under different water quality conditions were compared. The main iron oxides in the scale are 伪-Fe OOH (goethite), Fe3O4 (magnetite) and 纬-Fe OOH (ferrite). The content of 伪-Fe OOH is positively correlated with the basicity of the water and the hardness of calcium, and Fe3O4 is positively correlated with the Larsen index of water. However, there was no significant correlation between 纬-Fe OOH and the water quality parameters analyzed. A total of 40 inorganic elements were detected in the tube scale samples by X-ray fluorescence spectroscopy. Among them, the common and relatively high content inorganic elements were Fe,Si,Al,Ca,S,Cl, and VTI-Mo was also detected in more than half of the samples. La,Cr,Zn,Sr,Ta,Ni and other trace metal elements. The content of Al and Ba in pipe scale of groundwater is higher than that of surface water, while the content of Mo and Ni in pipe scale of surface water is higher than that of underground water. The content of Zn and Cu in pipe scale of different water source is not different.
【作者单位】：华北水利水电大学环境与市政工程学院;中国科学院饮用水科学与技术重点实验室;北京市自来水集团有限责任公司;
【基金】：国家自然科学基金资助项目(51378493、51178450) 国家水体污染控制与治理科技重大专项(2012ZX07404-002、2012ZX07408-002)
【分类号】：TU991.3

【参考文献】