Relative Importance of Factors Influencing Iron Release in Drinking Water Distribution Systems
Relative Importance of Factors Influencing Iron Release in Drinking Water Distribution Systems
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DOI：
10.13227/j.hjkx.201703249
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发表时间：
2017-12-15
期刊：
影响因子：
--
通讯作者：
Wu Xue
中科院分区：
文献类型：
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作者：
Liu Ying;Yu Ying;Wu Xue
近年来，饮用水分配系统中的铁释放（DWDS）引起了极大的关注。影响DWDS中铁释放的因素很多。在这项研究中，我们选择pH，溶解氧（DO），碱度（ALK），硬度，氯化物（Cl-），硫酸盐（SO42-），温度（T）和液压保留时间（HRT）作为要研究的因素。逐步回归和部分相关分析用作建立非线性功率指数铁释放模型并通过比较标准化回归系数和部分相关系数来确定这些因素的相对重要性的方法。结果表明铁释放模型非常合适。重要因素是SO42-，HRT，CL-和T，当通过标准化回归系数测量时，因子对铁释放的影响的相对重要性与HRT> Cl-> T近似；而重要的因素是HRT，SO42-，ALK，CL-和T，而当通过部分相关系数进行测量时，重要性是HRT> so42-> alk> cl-> t。结合了这两个结果，我们得出结论，HRT，SO42-和Cl-是影响本研究条件中管道中铁释放的最重要因素。 T和ALK的相对重要性根据实际情况而变化。
Iron release in drinking water distribution systems (DWDSs) has attracted significant attention in recent years. There are many factors influencing iron release in DWDSs. In this study, we select pH, dissolved oxygen (DO), alkalinity (Alk), hardness, chloride (Cl-), sulfate (SO42-), temperature (T), and hydraulic retention time (HRT) as factors to investigate. Stepwise regression and partial correlation analysis are used as methods for establishing nonlinear power exponent iron release models and determining the relative importance of these factors by comparing standardized regression coefficients and partial correlation coefficients. The results show that the iron release models fit well. The important factors are SO42-, HRT, Cl-, and T, and the relative importance of the effect of the factors on iron release is SO42- approximate to HRT > Cl- > T, when measured by standardized regression coefficients; whereas, the important factors are HRT, SO42-, Alk, Cl-, and T, and the order of importance is HRT > SO42- > Alk > Cl- > T, when measured by partial correlation coefficients. Combining these two results, we conclude HRT, SO42-, and Cl- are the most important factors affecting iron release in pipes for the conditions in this study. The relative importance of T and Alk changes depending on the actual situation.