Analysis of direct-drinking water quality and its influencing factors in primary and secondary schools in Nanjing City
Objective To investigate the quality and influencing factors of direct-drinking water in schools in Nanjing City,so as to provide basis for management of school drinking water.Methods From April to July 2023,direct drinking water equipment from 146 primary and secondary schools were selected from Nanjing City using a stratified random sampling method and tested for colony forming units(CFU)and permanganate index.Mann-Whitney U test was used to compare the differences between groups,and multiple linear regression was used to analyze the influencing factors.Results The CFU and permanganate levels of school di-rect drinking water in Nanjing City were 1.00(0.00,15.50)CFU/mL and 0.47(0.26,0.75)mg/L,respectively.The CFU level in-creased when the filter replacement time exceeded 3 months and when the water source was piped,while the permanganate index in-creased when the filter replacement time exceeded 3 months and using activated carbon technology(Z=-2.21,-3.92,-2.31,-8.45,P＜0.05).The results of multiple linear regression analysis showed that the replacement time of filter element exceeding 3 months was positively correlated with the CFU level,and the process type involving activated carbon,a laid pipe network and a fil-ter replacement time exceeding 3 months were positively correlated with the permanganate index(β=167.08,0.32,0.35,0.11,P＜0.05).Conclusions There are certain problems with the water quality of primary and secondary school direct drinking water in Nanjing City.Schools should promptly replace the filter and maintain the drinking water equipment to ensure the hygiene and safety of campus water quality.
DrinkingBacteriaPermanganate indexRegression analysisEnvironmental monitoringStudent health services
NETL
NSTL
万方数据
