2013～2015年南京市浦口区生活饮用水微生物检测结果分析

Analysis on results of living and drinking water microbial test in Pukou District of Nanjing City during 2013-2015

目的：了解2013~2015年南京市浦口区主要生活饮用水微生物污染状况，为提高饮用水卫生质量提供参考。方法按照《GB/T5750-2006生活饮用水标准检验方法》对2014~2015年送检的城市集中供水与农村集中供水末梢水、二次供水及直饮水3类生活用水进行检测，分析细菌菌落总数、总大肠菌群、耐热大肠菌群等情况。结果2013~2015年共检测生活饮用水526份，合格492份，合格率为93.5%。2013年3类生活饮用水合格率分别为87.2%、95.7%、50.0%，2014年3类生活饮用水合格率分别为90.6%、96.7%、75.0%，2015年3类生活饮用水合格率分别为92.1%、97.4%、42.9%；2013~2015年同一年3类生活饮用水之间合格率比较，差异均有统计学意义（χ2=9.64、8.57、28.24，P〈0.05）。2013~2015年末梢水、二次供水、直饮水同类生活饮用水合格率比较，差异均无统计学意义（χ2=0.56、0.49、1.67，P〉0.05）；城市末梢水合格率（93.7%）与农村（82.6%）比较，差异有统计学意义（χ2=4.25，P〈0.05）。末梢水、二次供水、直饮水3类生活饮用水的菌落总数指标合格率（90.1%、96.5%、58.8%）比较，差异有统计学意义（χ2=41.91，P〈0.01）。结论城市集中供水生活饮用水微生物指标合格率高于农村集中供水，3类生活饮用水菌落总数指标合格率最低，尤其是直饮水。相关部门应采取措施，提高生活饮用水质量，加强农村地区用水安全，确保人民群众饮水安全。

Objective To understand the microbial contamination status of main living and drinking water in Pukou Dis-trict of Nanking City to provide reference for improving the quality of living and drinking water. Methods According to the GB/T5750-2006 Living and Drinking Water Standard Examination Method,the 3 kinds of living water of urban centralized water sup-ply and rural centralized water supply tap water ,secondary water supply and direct drinking water were detected ,including the total number of bacterial colonies,total coliform group,thermotolerant coliform group,etc. Results Total by 526 living and drinking water samples were detected during 2013-2015 ,492 samples were qualified with the qualified rate of 93.5%. The quali-fied rates of 3-kind living and drinking water in 2013 were 87.2%,95.7%and 50.0%respectively,which in 2014 were 90.6%, 96.7%and 75.0%respectively,which in 2015 were 92.1%,97.4%and 42.9%respectively;the qualified rate of living and drink ing water in the same year during 2013-2015 had statistically significant difference among 3 kinds of water（χ2=9.64,8.57,28.24,P〈0.05）. The qualified rate of the same kind of living and drinking water in tap water,secondary water supply and direct drinking water had no statistical difference among 2013-2015（χ2=0.56,0.49,1.67,P〉0.05）;the qualified rates of tap water were 93.7%for urban tap water and 82.6%for rural tap water,the difference was statistically significant（χ2=4.25,P〈0.05）. The qualified rates of total number of bacterial colonies in tap water ,secondary water supply and direct drinking water were 90.1%,96.5%and 58.8%respectively,the difference was statistically significant（χ2=41.91,P〈0.01）. Conclusion The living and drinking water microbial indicators of urban centralized water supply is higher than that of rural centralized water supply ,the qualified rate of bacterial colony total number of 3-kind living and drinking water is lowest,especially direct drinking water. The relevant depart-ments should take measures to improve the quality of living and drinking water for ensuring the drinking water safety of masses.