2019—2022年河南省洛阳市农村生活饮用水微生物指标监测结果

Monitoring results of microbiological indicators for drinking water in rural areas of Luoyang,Henan,2019-2022

目的了解河南省洛阳市农村生活饮用水微生物污染状况,为农村生活饮用水监督和管理提供依据。方法收集2019—2022年洛阳市农村生活饮用水菌落总数、总大肠菌群和耐热大肠菌群监测数据,依据《生活饮用水卫生标准》(GB 5749—2006)对检测结果进行分析评价。结果共检测水样2886份,微生物综合指标、菌落总数、总大肠菌群和耐热大肠菌群合格率分别为82.12%、91.96%、86.31%和94.11%,均呈逐年上升趋势(χ^(2)趋势值分别为28.490、8.346、20.386、16.589,P均<0.05);不同水样微生物综合指标合格率枯水期高于丰水期,出厂水高于末梢水,地下水高于地表水,消毒水高于不消毒水(χ^(2)值分别为40.102、19.478、8.658、27.431,P均<0.05);不同地区微生物综合指标合格率为63.14%~98.15%(χ^(2)=275.954,P<0.05)。结论2019—2022年洛阳市农村生活饮用水微生物指标合格率逐年上升,但依然存在微生物污染现象,各部门应切实加强农村供水厂的建设和管理,保障居民饮水安全。

Objective To provide the evidence for the supervision and management of rural drinking water by understanding the microbial contamination of rural drinking water in Luoyang.Methods The monitoring data of total number of colonies、total coliforms and heat-resistant coliforms of drinking water in rural areas of Luoyang from 2019 to 2022 were collected,and the test results were analyzed and evaluated according to the Sanitary Standards for Drinking Water(GB 5749-2006).Results A total of2886 water samples were tested,and the qualified rates of microbial comprehensive indicator,total number of colonies,total coliforms and heat-resistant coliforms were 82.12%,91.96%,86.31%and 94.11%,respectively.All of them showed an increasing trend year by year(χ^(2)trend=28.490,8.346,20.386 and 16.589,respectively;all P<0.05).The qualified rate of microbial comprehensive indicator was higher in dry season than that in flood season,higher for finished water than that for peripheral water,higher for ground water than that for surface water,and higher for sterilized water that for unsterilized water(χ^(2)=40.102,19.478,8.658 and 27.431,respectively;all P<0.05).The qualified rate of microbial comprehensive indicators in different regions were between 63.14%-98.15%(χ^(2)=275.954,P<0.05).Conclusions The quality rate of microbial indicators for drinking water in rural areas of Luoyang had increased year by year from 2019 to 2022,but there was still microbial contamination;all relevant departments should effectively strengthen the construction and management of rural water supply plants to ensure the safety of drinking water for residents.