Study on water environment characteristics and potential pollution risk of drinking water sources on Ganjiang River
To ensure the safety of drinking water for residents,it is particularly important to understand the water environment characteristics and potential pollution risks of drinking water sources.Taking two drinking water source sections(Qingyun Water Plant and Chaoyang Water Plant)and their upstream and downstream sections in Nanchang City(West Lake section)of the Gan-jiang River as the research subjects,the water environment status of each section was investigated and analyzed,and the pollution attenuation and diffusion process in the upstream of the water source area was deduced.According to GB 3838-2022 Surface Wa-ter Environmental Quality Standards,the water quality safety level of the drinking water source was judged.By analyzing the phos-phorus release rate and phosphorus form characteristics of sediment in water bodies,we evaluated the pollution risk of endogenous phosphorus release in drinking water sources.The results showed that:① The water quality of the key sections on Ganjiang River(West Lake section)was Class Ⅱ water,and the chemical oxygen demand(COD)of the section of Qingyun Water Plant excee-ded the Class Ⅱ water standard in June 2022.② Qianhu Electric Discharge Station,a large-scale sewage outlet upstream of the drinking water source,would downgrade the water quality according to simulation results.③ The total phosphorus(TP)content in sediments of the Ganjiang River(West Lake section)was generally in a state of mild to moderate pollution.The main form of phosphorus in sediments was iron aluminum-bound inorganic phosphorus(Fe/Al-Pi),followed by moderately active organic phosphorus(MA-Po)and calcium-bound inorganic phosphorus(Ca-Pi),with average proportions of 32.56％,20.72％,and 19.4％,and average contents of 123.17,78.36,and 73.38 mg/kg,respectively.The organic matter(OM)content exhibited a significant correlation with the TP content(R=0.873,P≤0.05),and Fe/Al-Pi content(R=0.949,P≤0.05).④ The sec-tion of Qingyun Water Plant had the highest phosphorus release rate(vP),indicating a high risk of phosphorus release.It is rec-ommended to continuously monitor the water quality at upstream and downstream sections of the drinking water source,and closely monitor the TP index change of the Qingyun Water Plant section;regularly inspect and trace the water drained from the Qianhu E-lectric Discharge Station to avoid mixing of rainwater and sewage or the direct discharge of wastewater into the river;strengthen the standardized construction and management of riverside drinking water source protection areas,and reduce the impact of human ac-tivities on the water environment.The research results can provide certain references for scientifically ensuring the safety of urban drinking water.
drinking water sourcespollutant diffusion attenuation modelrisk of phosphorus release from sedimentphosphor-us formsGanjiang RiverWest Lake section of Nanchang City
万方数据
维普
