Analysis Of Drinking Water Quality In Rugao From 2009 To 2016

[Objective]Through the analysis of drinking water quality of residents in Rugao from 2009 to 2016,to grasp the sanitary status of drinking water in Rugao for the past 8 years,and the dynamic changes of drinking water quality in Rugao,and ensure the health and safety of drinking water for residents,so as to provide a basis for relevant departments to formulate policies and measures to improve the quality of drinking water.[Methods]According to the "Standard Test Method for Drinking Water"(GB/T5750-2006),the product water of each water plant in the city and the pipe network water at each monitoring point are collected,stored and transported to the laboratory every quarter.The test results were evaluated according to the SanitaryStandard for Drinking Water(GB 5749-2006).Apply Excel 2003 to sort out the test results,and build a database,adopting SPSS 17.0 for analysis.[Results]1.From 2009 to 2016,4,359 samples of all waterworks were collected,and 3,972 samples were up to standard,with an overall qualification rate of 91.12%.The annual qualification rate are:66.12%,79.60%,86.67%,91.65%,99.23%,99.49%,99.52%,and 99.69%respectively.The annual qualification rate increased year by year,and there was a statistical difference(?2=679.564,P<0.05).Among them,?Product water:From 2009 to 2016,a total of 889 samples were collected,783 were up to standard,and the qualification rate was 88.08%.The annual qualification rate are:50.55%,70.59%,81.00%,90.53%,98.90%,99.19%,99.28%and 100%respectively.The annual qualification rate increased year by year,and there was a statistical difference(?2=218.308,P<0.05).?Pipe network terminal water:From 2009 to 2016,a total of 3,470 samples were collected,and 3,189 of them met the standard,and the qualification rate was 91.90%.The annual qualification rates are:69.67%,81.91%,88.10%,91.92%,99.30%,99.57%,99.59%,and 99.60%respectively.The annual qualification rate increased year by year,and there was a statistical difference(?2=472.818,P<0.05).The qualification rate of the product water is lower than the qualification rate of the end water of the pipe network.2.From 2009 to 2016,a total of 997 water samples were collected in the first quarter,with 833 samples met the standard and a qualification rate of 83.55%.From 2009 to 2016,a total of 1,393 water samples were collected in the third quarter,with 1,277 met standards,the qualification rate was 91.67%.After comparison,there was a significant difference of the water sample qualification rate at different time points(?2=37.062,p<0.05).Among them,?From 2009 to 2016,a total of 274 samples of product water were collected in the first quarter,213 of which met the standard,and the qualification rate was 77.74%.In the third quarter,321 samples of product water were collected,and 277 were up to standard,the qualification rate was 86.29%.After comparison,there was a significant difference of the water sample qualification rate at different time intervals(?2=7.445,P<0.05).?From 2009 to 2016,a total of 723 samples of terminal tap water were collected in the first quarter.Among them 620 met the standard,the qualification rate was 85.75%.In the third quarter,1072 samples of terminal tap water were collected,and 1000 met standards,the qualification rate was 93.28%.By comparison,there was a significant difference in the qualification rate of water samples at different time points(?2=27.823,P<0.05).3 From 2009 to 2016,a total of 2,136 samples were collected from municipal water plants,with 2,134 met standards,and the qualification rate was 99.91%.From 2009 to 2016,a total of 2,163 samples were collected from township-level water plants,with 1,778 met standards.The qualification rate was 82.20%.From 2009 to 2016,a total of 60 samples were collected from the self-built water plant.All water samples met the standard,and the qualification rate was 100%.By comparison,there were significant differences in the qualification rates of water samples from different levels of waterworks(?2=422.385,P<0.05).Among them,there is a significant difference between the water qualification rate of municipal water plants and township water plants(?2=27.823,P<0.05),the water qualification rate of municipal water plants>the qualification rate of township water plants.There is no statistical significance between the water qualification rate of municipal water plants and self-built water plants(?2=0.056,P>0.05);There are obvious differences between the water qualification rate of township water plant and self-built water plant(?2=12.917,P<0.05),and the water qualification rate of self-built water plant>township water plant.4.From 2009 to 2016,2,959 samples of liquid chlorine disinfection were collected,and 2,844 of them met the standard,and the qualification rate was 96.11%.From 2009 to 2016,a total of 1,400 samples of chlorine dioxide disinfection were collected,and 1128 of them met the standard,the qualification rate was 80.57%.By comparison,there is a significant difference between the qualification rate of water samples sterilized with liquid chlorine and the qualification rate of chlorine dioxide disinfection water samples(?2=283.766,P<0.05),and the qualification rate of liquid chlorine disinfected samples>chlorine dioxide disinfection samples.5.From 2009 to 2016,testing results showed that many of the water quality testing indexes tested did not meet the standard.These indexes are turbidity,oxygen depletion,Chromaticity,visible matter,ammonia nitrogen,arsenic,manganese,iron,nitrite,chlorine or chlorine dioxide,total number of colonies,total coliform flora,heat resistant coliform flora.[Conclusion]1.From 2009 to 2016,the qualification rate of drinking water in Rugao increased year by year,and there were statistical differences.The product water and terminal tap water qualification rates also showed the same trend,and there were statistical differences.However,the product water qualification rate is lower than that of the terminal tap water,which may be caused by the uncertainty of the sampling ratio.2 From 2009 to 2016,the qualification rate of water samples in the first quarter and the third quarter of Rugao showed a year-on-year growth trend,and there were statistical differences.This is true whether it is product water or terminal water.However,the water qualification rate in the first quarter was lower than the third quarter qualification rate,probably due to the backwater flow caused by the drop in water level during the dry season.3 From 2009 to 2016,the water sample qualification rate of Rugao municipal water plant was 100%except for 2009,and there was no statistical difference;the water sample qualification rate of township water plants increased year by year,there was statistical difference.There is only one self-built water plant,and the qualification rate is 100%.By comparison,the water qualification rate of municipal water plants is higher than that of township water plants.4 From 2009 to 2016,the qualification rate of water samples adopting liquid chlorine disinfection in Rugao is higher than that of adopting chlorine dioxide disinfection.5 There are total 14 water quality indexes did not meet the corresponding standards in 2009.Since the implementation of regional water supply,water quality has been improved significantly.By 2016,only two water quality indexes were not up to standard.