生活饮用水细菌学指标的影响因素

目的探讨气温、余氯含量对生活饮用水中细菌学指标的影响.方法于2003-2004年对滨州市东郊水厂和二水厂进行水质监测,每月采集水源水、出厂水、各供水网点末梢水各1次,测定细菌总数、大肠菌群和余氯.依据滨州市气象局提供的气温资料分别对气温与水源水中细菌总数、总大肠菌群的相关性进行分析.同时,对出厂水及末梢水中余氯含量与细菌总数的相关性进行分析.结果东郊水厂细菌总数、总大肠菌群与月平均气温均呈正等级相关(细菌总数:rs=0.687,P＜0.05;总大肠菌群:rs=0.747,P＜0.01),二水厂细菌总数、总大肠菌群与月平均气温均呈正等级相关(细菌总数:rs=0.671,P＜0.05;总大肠菌群:rs=0.726,P＜0.01).出厂水与末梢水中余氯含量与细菌总数呈负等级相关(出厂水:rs=-0.555,P＜0.05;末梢水:rs=-0.486,P＜0.05).结论水源水中细菌总数、总大肠菌群随着气温的升高而增高,细菌总数随余氯含量的增高而降低.

Factors Influencing the Bacteriological Indexes of Drinking Water

Objective To study the effect of temperature and content ot residual chlorine on bacteriological indexes ot drinking water. Methods In 2003-2004, the drinking water quality was monitored and the relationship between temperature, content of residual chlorine and the bacteriological indexes of drinking water was investigated in two water plants in Binzhou, Shandong province. Results As for the water source, the bacteriological indexes presented a positive correlation with the temperature, the total amount of bacteria presented a negative correlation with the content of residual chlorine in the tap water. Conclusion Temperature and content of residual chlorine in drinking water are important factors in prevention and control of drinking water contamination.