Research on the water quality characteristics of the water distribution interface of the water supply pipe network with opposite water sources
In a two-source water distribution system(WDS),the water quality of the water supply would be affected by the pipe network system.Therefore,the dynamic changes in the water distribution interface under this mode and the water quality safety issues need to be paid more at-tention to.In this study,a one-year sampling and analysis of drinking water quality in the water distribution interface of a two-source WDS of Suzhou city was conducted,and the change character-istics of dissolved organic matter(DOM)in the pipeline network and residual chlorine reaction with disinfecting precursors were mainly investigated.The results showed that the raw water from Plant X contained more bromine-containing precursors that easily reacting with residual chlorine,while Plant Y contained more chlorinated precursors,which resulted that the maximum dibromo-mono-chloromethane(DBCM)and tribromomethane(TBM)concentration was observed at point D-10,which was close to the X water plant,and the maximum concentration of trichloromethane(TCM)and monobromodichloromethane(BDCM)reached at the point D-12(close to the Y water plant).In addition,temperature was the main factor affected the concentration change of residual chlorine and its reaction efficiency with DBPs.From June to September,the residual chlorine concentration at the interface of the water supply was significantly lower than that of the other months,while the concentration of trihalomethane was higher than that of the other months.Due to the difference in raw water quality and the changes in the water supply volume of the pipeline network with the user's water demand,the water quality risk of the pipeline network in the water distribution inter-face of the dual water source opposed water supply system was higher than that of other pipeline sections,and the water quality safety of this area needs to be paid attention to.
Double-water source supplyWater quality assuranceWater distribution interfaceThree-dimensional fluorescenceResidual chlorineDisinfection by-products
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