某省城市供水末梢水合格率高于出厂水原因分析

冯晓亮; 王志强

doi:10.13421/j.cnki.hjwsxzz.2017.03.006

某省城市供水末梢水合格率高于出厂水原因分析

Analysis on the Cause of Higher Qualified Rate of Terminal Piped-water than Treated Water from Urban Water Supplies in a Province

摘要

摘要:
目的探讨城市供水末梢水合格率高于出厂水的原因。
方法以2014年某省城市供水水质监测结果为样本，按照供水能力，将水厂分为3组，分别为： < 10 000 t/d、（10 000~50 000）t/d以及≥50 000 t/d，计算每组水厂的出厂水、末梢水合格率。
结果分组前出厂水合格率低于末梢水合格率，分组后3组水厂的出厂水合格率均高于末梢水合格率。
结论比较出厂水以及末梢水合格率时，应根据具体情况分组、分类计算，从而消除因为出厂水、末梢水采样比例的不确定可能带来的影响。

Abstract:
Objective To explore the cause of higher qualified rate of terminal piped-water than treated water from urban water supplies in a province.
Methods Monitoring the water quality of urban centralized water supplies in a province in 2014. Based on the capacity of water supply, waterworks were divided into three categories: < 10 000 t/day, 10 000~50 000 t/day and ≥50 000 t/day. The qualified rate of treated water and terminal piped-water of each category was calculated.
Results The qualified rates of treated water were lower than those of terminal piped-water before the data was not divided into categories. When samples were divided into three categories according to the capacity of water supply, the qualified rates of treated water were higher than those of terminal piped-water in each category.
Conclusions When comparing the qualified rates of treated water with terminal piped-water, the calculation of results should be based on specific circumstances for classification, to eliminate the possible impact of the uncertainties from wrong sampling proportion.

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