【摘要】 目的了解目前北京市朝阳区二次供水卫生学现状,为开展二次供水风险评估及管理提供依据。方法采取分层随机抽样方法,抽取130套二次供水设施进行现场调查和水样检测。采用一般统计学描述性分析和χ2检验对结果进行统计处理分析。结果 130套二次供水设施涉及供水人口156 413人,其中无负压供水设施占63.85%,水箱供水设施占36.15%。消毒设备配备率50.77%,消毒方式以紫外线消毒为主。98.46%的二次供水单位具备有效期内的供水卫生许可证。99.23%的二次供水单位有卫生管理制度。二次供水每年至少检测1次。二次供水设备入口水、出口水、末梢水合格率分别为96.15%、96.15%、95.38%,三者差异无统计学意义(χ~2=0.13,P>0.05)。不合格项目为浑浊度、肉眼可见物、硝酸盐、铁和菌落总数,合格率由低到高分别为97.95%、98.21%、99.23%、99.49%和99.74%。结论北京市朝阳区二次供水设施和水质卫生整体状况良好。更多还原

【Abstract】 Objective To investigate the hygienic status of secondary water supply in Chaoyang district and provide basic evidence for risk assessment and management. Methods 130 sets of secondary water supply facilities were selected by stratified random sampling method to carry out field investigation and water test.The general statistical descriptive analysis and Chi-square test were used for data analysis. Results The 130 sets of secondary water supply facilities could support 156 413 people for the use of water.Non-negative pressure facilities accounted for 63.85% and water tank facilities accounted for 36.15%.The installation rate of disinfection devices was 50.77%.The main disinfection method was ultraviolet disinfection.98.46% of secondary water supply units had valid hygienic license and 99.23% had health management system.Water was tested at least once a year.The qualified rates of source water,secondary water and peripheral water were 96.15%,96.15%,95.38%,respectively,the difference was not significant(χ2=0.13,P>0.05).The passing rates for water turbidity,visible impurity,nitrate,iron and total number of colony were 97.95%,98.21%,99.23%,99.49% and 99.74%,respectively. Conclusions The hygienic status and drinking water quality of secondary water supply in Chaoyang district of Beijing are good in general.更多还原