二次供水与集中式供水水质卫生状况比较

目的：比较二次供水与集中式供水的水质卫生情况，了解和评价二次供水的水质卫生状况。方法：对信阳市卫生防疫站2002年以来监测的二次供水和集中式供水样品结果进行统计分析，做出比较和评价。结果：二次供水综合合格率为70．39％，集中式供水综合合格率为84．24％，二次供水与集中式供水比较某些项目合格率发生明显变化，其中游离余氯降低12．08％，总大肠菌群降低24．55％，菌落总数降低14．18％。菌落总数总体均值差别和总大肠菌群、游离余氯总体均值差别有统计学意义。结论：集中式供水卫生合格率较低，二次供水在输送与贮存过程中又存在着明显的二次污染。二次供水卫生状况较差。

COMPARISON ON THE WATER QUALITY HYGIENE SHUATION OF SECONDARY WATER SUPPLY AND SUPPLY WATER CENTRALIZED TYPE

Objective:To compare the hygienic quality of secondary water supply and centralized water supply and to assess the hygienic quality of secondary water supply.Methods:The results of the samples monitored by Sanitary and anti-epidemic station of Xinyang since 2002 were analyzed,and comparison and assessment on them was conducted.Results:The general qualification rate of secondary water supply was 70.39%,and that of centralized water supply was 84.24%.Compared to the centralized water supply,the qualification rate of some items of secondary water supply changed obviously.The qualification rate of chlorine was 12.08% lower,total Coliform group was 24.55% lower,and that of total colony amount was 14.18% lower.The difference of mean value of total amount of the colony had a significant difference.And the general average of total Coliform group and total residual chlorine had a significant difference.Conclusion:The qualification rate of the centralized water supply is low.There are obvious secondary contaminations existed in the course of the water supply system.The quality of secondary water supply is comparatively lower.