Analysis Of The Monitoring Results Of Urban Secondary Water Supply In Jilin Province From 2016 To 2019

Objective:Through the analysis of the water quality monitoring results of the urban secondary water supply in Jilin Province from 2016 to 2019,evaluate the sanitation status of the urban secondary water supply in Jilin Province,discuss its potential health risks,and take effective measures for the relevant departments to reduce and eliminate the urban secondary water supply water quality problems,and provide a scientific basis for improving the quality of secondary water supply and safeguarding the health of the people.Methods:According to the"Drinking Water and Environmental Sanitation Work Plan of Jilin Province"and"Technical Specifications for Drinking Water and Environmental Sanitation Work of Jilin Province",the data of the urban secondary water supply monitoring results of 9 cities and autonomous prefectures in Jilin Province from 2016to 2019 were collected by Jilin Province.Each city and county disease prevention and control center reported,and finally reviewed and summarized by the Jilin Provincial Center for Disease Control and Prevention Environmental and Health Hazard Factors Prevention and Control Institute.Use Excel 2010 software to establish a database,and use IBM SPSS 24.0 to analyze the data.The monitoring results of various indicators of water quality were statistically described.Useχ~2 test or Fisher exact probability method was to compare the water quality of the urban secondary water supply in different years,different water sources,and different disinfection methods.The test level wasα=0.05.Results:1.Overall water quality test results of urban secondary water supply in Jilin Province from 2016 to 2019(1)From 2016 to 2019,the overall water quality qualification rate of the secondary water supply in Jilin Province respectively 83.78%,83.29%,90.04%,and 88.96%.The difference in the overall water quality qualification rate of the secondary water supply in different years was statistically significant(P<0.05).(2)From 2016 to 2019,the difference in the overall water quality qualification rate of the secondary water supply in different water source cities in Jilin Province was statistically significant(P<0.05).Among them,the qualification rate of using surface water as a water source in 2016,2018,and 2019 was significantly higher than that of groundwater sources(P<0.05).The difference in the overall water quality qualification rate of urban secondary water supply with rivers,lakes,reservoirs,and deep wells as water sources was statistically significant(P<0.05).Reservoirs have the highest qualification rate,and lakes have the lowest qualification rate.(3)From 2016 to 2019,the difference in the overall water quality qualification rate of the urban secondary water supply with different disinfection methods in Jilin Province was statistically significant(P<0.05).Among them,in 2016,2017,and 2018,the qualification rate of non-sterilized treatment was higher than that of sterilized treatment(P<0.05).The difference in the overall water quality qualification rate of the urban secondary water supply disinfected with free chlorine,high-purity chlorine dioxide,and compound chlorine dioxide was statistically significant(P<0.05).The free chlorine disinfection method has the highest qualification rate,and the high-purity chlorine dioxide disinfection method has the lowest qualification rate.2.Test results of sensory properties and general chemical indicators of urban secondary water supply in Jilin Province from 2016 to 2019.(1)From 2016 to 2019,the qualification rate of sensory traits and general chemical indicators of urban secondary water supply in Jilin Province respectively 92.07%,95.65%,96.89%and 96.82%.The difference in the qualification rate of sensory traits and general chemical indicators of urban secondary water supply in different years was statistically significant.Significance(P<0.05).(2)From 2016 to 2019,the difference between the sensory properties of the secondary water supply and the general chemical index qualification rate of different water source cities in Jilin Province was statistically significant(P<0.05).Among them,the qualification rate of using surface water as a water source in 2016 and 2019 was significantly higher than that of groundwater sources(P<0.05).In 2018,the qualification rate of using groundwater as a water source was significantly higher than that of surface water sources(P<0.05).The sensory properties of urban secondary water supply with lakes,reservoirs,and deep wells as water sources have statistically significant differences with general chemical indicators(P<0.05).Reservoirs have the highest qualification rate,and lakes have the lowest qualification rate.(3)From 2016 to 2019,the difference between the sensory characteristics of the secondary water supply and the general chemical index qualification rate of different disinfection methods in Jilin Province was statistically significant(P<0.05).Among them,the qualification rate of non-sterilized treatment in 2016 was higher than that of sterilized treatment(P<0.05).The sensory properties of the urban secondary water supply disinfected with free chlorine,high-purity chlorine dioxide,and compound chlorine dioxide have statistically significant differences with the pass rate of general chemical indicators(P<0.05).The free chlorine disinfection method has the highest qualification rate,and the high-purity chlorine dioxide disinfection method has the lowest qualification rate.3.Test results of toxicology indicators of urban secondary water supply in Jilin Province from 2016 to 2019.(1)From 2016 to 2019,the qualification rate of toxicological indicators of urban secondary water supply in Jilin Province respectively 96.81%,98.99%,97.91%,and99.60%.The difference in the qualification rate of toxicological indicators of urban secondary water supply in different years was statistically significant(P<0.05).(2)From 2016 to 2019,the difference in the qualification rate of the secondary water supply toxicological indicators of different water source cities in Jilin Province was statistically significant(P<0.05).Among them,in 2016,2017,2018,and 2019,the qualification rate of using surface water as a water source was significantly higher than that of groundwater sources(P<0.05).The difference in the qualification rate of the secondary water supply toxicological indicators in cities with reservoirs and deep wells as water sources was statistically significant(P<0.05).Lakes have the highest qualification rate,and deep wells have the lowest qualification rate.(3)From 2016 to 2019,there was no statistically significant difference in the qualification rate of toxicological indicators for the secondary water supply in cities with different disinfection methods in Jilin Province(P>0.05).Free chlorine,high-purity chlorine dioxide,and undisinfected urban secondary water supply toxicological index qualification rate differences were statistically significant(P<0.05).The compound chlorine dioxide disinfection method has the highest qualification rate,and the high-purity chlorine dioxide disinfection method has the lowest qualification rate.4.Test results of microbiology indicators for urban secondary water supply in Jilin Province from 2016 to 2019.(1)From 2016 to 2019,the qualification rate of the microbiological indicators for the secondary water supply in Jilin Province respectively 97.61%,97.90%,98.89%and99.13%.The difference in the qualification rate of the microbiological indicators for the secondary water supply in different years was statistically significant(P<0.05).(2)From 2016 to 2019,there was no statistically significant difference in the qualification rate of the secondary water supply microbiological indicators in the cities of different water source types in Jilin Province(P>0.05).The difference in the qualification rate of microbiological indicators for the secondary water supply in cities with rivers,deep wells,and reservoirs as water sources was statistically significant(P<0.05).Reservoirs have the highest qualification rate,and rivers have the lowest qualification rate.(3)From 2016 to 2019,there was no statistically significant difference in the qualification rate of microbial indicators for the secondary water supply of different disinfection methods in Jilin Province(P>0.05).The difference in the qualification rate of microbiological indicators of the urban secondary water supply disinfected with free chlorine,high-purity chlorine dioxide,and compound chlorine dioxide was statistically significant(P<0.05).The free chlorine disinfection method has the highest pass rate of poisonousness,and the compound chlorine dioxide disinfection method has the lowest pass rate.Conclusion:1.From 2016 to 2019,the overall water quality qualification rate of urban secondary water supply in Jilin Province have shown an upward trend.2.From 2016 to 2019,the main unqualified indicators of the sensory traits and general chemical indicators of urban secondary water supply in Jilin Province were turbidity,manganese and oxygen consumption.The passing rate of sensory traits and general chemical indicators showed an upward trend in the four years.3.From 2016 to 2019,the main unqualified indicators of the toxicological indicators of urban secondary water supply in Jilin Province were fluoride and nitrate,The passing rate of toxicological indicators showed an upward trend in the four years.4.From 2016 to 2019,the main unqualified indicators of the microbial indicators for the secondary water supply in Jilin Province were total coliforms and the total number of colonies,and the qualified rate of microbial indicators showed an upward trend in the four years.