1093份水源水和生活饮用水微生物学指标分析

Analysis on Microbiological Indicator in 1093 Samples of Source Water and Domestic Drinking Water

目的了解水源水和生活饮用水指标微生物污染现状,为饮用水的监督监测提供参考依据。方法按GB/T5750-2006《生活饮用水标准检验方法》和GB 5749-2006《生活饮用水卫生标准》对送检的369份水源水和724份生活饮用水进行菌落总数、总大肠菌群、耐热大肠菌群的检测和判定。结果水源水的总合格率为26.83%。总大肠菌群和耐热大肠菌群的合格率分别为36.86%和50.14%,总大肠菌群合格率明显低于耐热大肠菌群(χ2=214.20,P<0.01)。生活饮用水的合格率为61.74%。不同季度的生活饮用水合格率差异有统计学意义(χ2=15.56,P<0.01),二季度的合格率最低。结论水源水中总大肠菌群污染严重;生活饮用水中丰水期的二季度受微生物污染较严重。应加强对水源的保护,加强丰水期生活饮用水监督监测。

Objective To investigate the microbial contamination of 1093 source water and domestic drinking water,and to provide references for drinking water surveillance. Methods A total number of 369 samples of source water and 724 samples of domestic drinking water were detected the numbers of aerobic bacterial count,total coliform bacteria and thermotolerant coliform bacteria according to Standard examination methods for drinking water（ GB / T 5750-2006） and were evaluated according to Standards for drinking water quality（ GB5749-2006）. Results The global qualified rate of source water was 26. 83%. The qualified rates of total coliforms and thermotolerant coliforms were 36. 86% and 50. 14%,respectively,with statistical difference between the both（ χ2= 214. 20,P 0. 01）. The qualified rate of domestic drinking water was 61. 74%,with statistical difference among seasons（ χ2= 15. 56,P 0. 01）. Conclusion The contamination of the total coliform bacteria in source water is severe and the microbiological contamination in domestic drinking water in the wet season is relatively severe. Thus, water source protection and drinking water surveillance on domestic drinking water in the wet season are yet to be strengthened.