2016—2020年廊坊市生活饮用水微生物指标监测结果分析

Analysis on monitoring results of microbiological indicators of drinking water in Langfang City from 2016 to 2020

目的 对2016—2020年廊坊市生活饮用水中微生物指标的监测结果进行分析,为加强饮用水安全管理提供数据和技术支持。方法 按照《生活饮用水标准检验方法》(GB/T 5750—2006)对2016—2020年廊坊市生活饮用水水样进行采集和检测。结果 2016—2020年廊坊市共检测生活饮用水水样3 673份,不合格399份,总不合格率为10.86%,各年不合格率差异均有统计学意义(χ^(2)=203.104、259.802、130.003、120.072、20.863,P均<0.01)。菌落总数不合格380份,不合格率为10.35%;总大肠菌群不合格72份,不合格率为1.96%;耐热大肠菌群不合格41份,不合格率为1.12%;大肠埃希菌不合格率为0%。出厂水不合格152份,不合格率为11.52%;末梢水不合格237份,不合格率为11.03%;二次供水不合格10份,不合格率为4.88%,各年不同类型生活饮用水不合格率差异均无统计学意义(χ^(2)=0.086、4.477、2.850、5.185、0.225,P均>0.05)。丰水期不合格199份,不合格率为10.74%;枯水期不合格200份,不合格率为10.99%。城市不合格48份,不合格率为4.46%;农村不合格351份,不合格率为13.52%,农村不合格率明显高于城市(χ^(2)=64.584,P<0.01)。结论 2016—2020年廊坊市生活饮用水安全存在一定风险,需采取改进措施。

Objective Analysis of the monitoring results of microbiological indicators in Langfang′s domestic drinking water from 2016 to 2020,to provide data and technical support for strengthening the safe management of drinking water.Methods The samples were collected and detected according to the Standard Test Method for Drinking Water(GB/T 5750—2006) from 2016 to 2020.Results From 2016 to 2020,a total of 3 673 domestic drinking water samples were tested in Langfang, and the number of unqualified samples was 399,with a total unqualified rate of 10.86%,with statistically significant differences in failure rates in all years(χ^(2)=203.104,259.802,130.003,120.072,20.863,all P<0.01).The total number of colonies failed 380,the failure rate was 10.35%,total coliforms dailed 72,the failure reta was 1.96%,heat-resistant coliforms failed 41,the failure rate was 1.12%,Escherichia coil failure rate was 0%.Among them, the unqualified number of factory water was 152,and the unqualified rate was 11.52%.The unqualified number of end water was 237,and the unqualified rate was 11.03%.The unqualified number of secondary water supply was 10,and the unqualified rate was 4.88%,no statistically significant difference in the failure rate of different types of domestic drinking water in every year(χ^(2)=0.086,4.477,2.850,5.185,0.225,all P>0.05).The failure rate was 10.74% for 199 samples during the high water period and 10.99% for 200 samples during the low water period.The unqualified number of urban water was 48,with a failure rate was 4.46%.The unqualified number of rural water was 351,with a failure rate was 13.52%,and the failure rate in rural areas was significantly higher than that in urban areas(χ^(2)=64.584,P<0.01).Conclusion There are cretain risks to the safety of living drinking water in Langfang from 2016 to 2020,improvement measures need to be taken.