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目的了解宜宾市市区二次供水质量情况,为宜宾市饮用水的质量监督管理提供科学依据,保障居民用水安全。方法根据2004年-2013年10年间宜宾市疾病预防控制中心对宜宾市市区二次供水检测所得的结果进行分析,对各年的合格率情况进行了统计分析,统计不合格项目的件数,游离性余氯的最大值、最小值和平均值,并比较了同时期末梢水的测定结果。结果各年份合格率无统计学意义(χ2=8.977,P>0.05),宜宾市市区二次供水10年平均合格率为85.9%,低于末梢水合格率93.2%,不合格项目主要为大肠菌群8.88%,细菌总数3.85%,游离性余氯2.51%,游离性余氯最大值为1.0 mg/L,最小值为0.02 mg/L,平均值普遍偏低。结论宜宾市市区二次供水基本符合国家标准,但应加强对二次供水情况的监管,适当增加检测项目,并提高二次供水的消毒水平。
Objective To understand the quality of secondary water supply in downtown Yibin and to provide a scientific basis for the quality supervision and management of drinking water in Yibin to ensure the safety of residents’ water use. Methods Based on the results of Yibin Municipal CDC in 2004 and 2013, the results of secondary water supply in Yibin City were analyzed and statistical analysis was conducted on the passing rates of each year. The number of unqualified items, the number of unqualified items, The maximum, minimum and average of residual chlorine, and the results of the measurement of the peripheral water at the same time were compared. Results The passing rate in each year was not statistically significant (χ2 = 8.977, P> 0.05). The average passing rate of secondary water supply in Yibin downtown in 10 years was 85.9%, which was lower than 93.2% of the final water passing rate. The unqualified items were mainly the large intestine 8.88% of the flora, 3.85% of the total number of bacteria, 2.51% of the free residual chlorine, the maximum value of the free residual chlorine is 1.0 mg / L, the minimum value is 0.02 mg / L, the average value is generally low. Conclusion The secondary water supply in urban area of Yibin basically meets the national standards, but the supervision of secondary water supply should be strengthened, the testing items should be increased appropriately, and the disinfection level of secondary water supply should be increased.