摘要
Abstract
In July 2023,due to the impact of Typhoon Doksuri,Beijing suffered from continuous heavy rainfall for several days,resulting in the South-to-North Water Diversion Ring Pipeline water supply source being switched from South-to-North water to local water source.To ensure the safety of water sup-ply quality,emergency dispatch and disposal measures are taken,emergency water quality monitoring is carried out,and the trend of water quality changes,coupling of water quantity and quality,and reduction of pollution load are analyzed.The results showed that adopting water supply line 4 for emergency dis-patch,fully utilizing the sedimentation and dilution effects of the regulating tank,the turbidity at the out-let of the regulating tank decreased by 90.19％compared to the incoming water,the permanganate index decreased by 53.59％,the chemical oxygen demand decreased by 52.93％,and the water quality category was upgraded from surface water category Ⅲ to category Ⅱ.The water quality was effectively improved,and the water quality at the outlet met the water supply requirements;The high turbidity incoming water is mixed with the original storage water in the regulating tank,and the improvement effect of water quality through sedimentation and dilution in the regulating tank is more significant than that of pure water mix-ing.Among them,the impact on turbidity is greater,and the impact on conductivity,pH,and dissolved ox-ygen indicators is not significant;The potassium permanganate index and chemical oxygen demand pollu-tion load reduction rate were 73.49％and 78.00％,respectively,indicating a significant reduction in pollu-tion load.The joint regulation of water quality and quantity was effectively utilized.The research results provide guidance for ensuring water quality in subsequent emergency situations.关键词
污染负荷/供水水质安全/"23·7"特大暴雨/亦庄调节池Key words
pollution load/water quality safety of water supply/"23·7"extremely heavy rainstorm/Yi-zhuang regulating pool分类
建筑与水利
