Comparative study on influencing factors of rural drinking water quality during two Five-Year Plans in six urban districts of Nanning city
Objective To understand the situation of rural drinking water quality in six urban districts of Nanning city.Methods The monitoring sites shall be set up in more than 85％of townships(including villages)in the six old urban areas of Nanning city.In the dry season(March-April)and wet season(July-September)in 2011 to 2015(the 12th Five-Year Plan)and 2016 to 2020(the 13th Five-Year Plan),the water samples of finished water and tap water were collected for the determination and evaluation.Results The qualified rate of rural drinking water was 33.4％during of the 12th Five Year Plan period and 65.8％during the 13th Five Year Plan period,with significant difference(P＜0.01).The total qualified rate in ten years was 52.5％.During the two five-year planning periods,the low qualified rate of microbiological parameters was the major problem.During the 13th Five Year Plan period,most indicators were better than those during the 12th Five Year Plan period,but some indicators(chlorate,aluminum,etc.)related to water quality treatment exceeded the standard limits on an upward trend.The results of multivariate logistic regression analysis of 10-year data showed that the"13th Five Year Plan"period(OR=0.26,95％CI:0.19-0.35),the high flow period(OR=0.66,95％CI:0.53-0.82),the presence of health license(OR=0.76,95％CI:0.64-0.90)had lower risk of nonconformity,and the surface water had higher risk of unqualified(OR=1.56,95％CI:1.12-2.18).Conventional treatment of water samples was a protective factor,and the unqualified risk was lower than the disinfection only(OR=2.02,95％CI:1.36-3.00),the no treatment(OR=2.58,95％CI:1.75-3.79),and the sedimentation filtration(OR=4.18,95％CI:2.49-7.01).Conclusion The sanitation of rural drinking water in Nanning showes a gradual upward trend,but some problems still exist,such as the qualified rate of microorganism index is not high.The water sample treatment method and other factors have great influence on the qualified rate.It is therefore proposed strengthening supervision and technical guidance to improve the water quality treatment capacity and technical level of water supply units.
Rural areaDrinking waterMonitoringthe 12th Five Year Planthe 13th Five Year Plan
NETL
NSTL
万方数据
