Hygienic evaluation of a waterworks used central line of South-to-North Water Diversion Project as a water source
Objective To understand the hygienic status of a waterworks used South-to-North Water Diversion Project as the water source in a plain county of Hebei province after it built.Methods From July to September 2024,based on the related national laws,regulations,standards,the hygienic evaluation and the suggestions for improvement of this drinking water project during operation were conducted through questionnaire survey and interview,on-site hygienic investigation,water source hygienic evaluation,water treatment process evaluation,water quality test and expert consultation.Results As for this waterworks,the site selection and layout,water treatment process,water pipeline network and water supply management were in line with the requirements of hygienic specification for water supply units and coagulation,sedimentation,filtration and disinfection were used.The waterworks was designed to supply water with a capacity of 7.5×104 m3/d,and the actual daily water supply capacity was 6.0×104 m3/d,covering 530 000 people.The water plant adopts the conventional treatment process of coagulation,sedimentation,filtration and disinfection.The pipe network operated normally,with a leakage rate of 10％,and the tests of source water,finished water and terminal water were carried out regularly,with qualified rate of 100％in 2024.Conclusion The water quantity guarantee rate of this drinking water safety project is ≥95％,the operation of water quality treatment facilities is normal,the leakage rate of pipeline network is normal,the health license approval documents of water-related products are complete,and the water quality meets the requirements of drinking water safety.The current daily water treatment volume is close to the upper limit of the project's capacity,which is easy to cause insufficient time for water treatment,and a small amount of alum flowers into the clearing pool risk,and the detection capacity is insufficient,and the on-line monitoring instruments are not regularly maintained.It is recommended to do the following:strengthen the protection and monitoring of water sources to avoid algae contamination in summer,accelerate the construction of the second phase of the waterworks,increase the water treatment facilities,optimize the water purification and disinfection processes,strengthen the transmission and distribution pipeline network inspection and update,strengthen the online testing equipment maintenance and the laboratory testing capacity and strengthen the health supervision.
South-to-north water diversion projectWaterworks used surface water as the sourceDrinking water safety projectHygienic evaluation
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