北京城市副中心水系景观工程对水质的影响分析
Analysis of Water Quality of Water System for Landscape Engineering in Beijing Sub-Center Administrative Office Area

本文通过对测量镜河化学需氧量(COD_Cr)、氨氮(NH₃-N)及总磷(TP)三个指标，分析影响镜河水质的因素，提出改善水环境的建议，为北京城市副中心的水系景观工程提供参考。自2018年10月15日开始蓄水至今，北京城市副中心行政办公区水系景观工程-镜河泵站已稳定运行数年，镜河水位及库容基本稳定。随着再生水、砂滤水补水及镜河向北运河退水的进行，河道水质发生变化，其中化学需氧量(COD_Cr)、氨氮(NH₃-N)及总磷(TP)浓度基本达到地表IV类水质标准，后续可以通过进一步增加水体流动性、改善补水水质、加强长期监管等措施提高镜河水质。
This paper aims to analyze the factors of affecting the water quality of Jing River by measuring the contents of chemical oxygen demand (COD_Cr), ammonia nitrogen (NH₃-N) and total phosphorus (TP). Suggestions of improving the water environment provide a reference for the water system landscape engineering in Beijing sub-center. Since the impounding began on October 15, 2018, the Jing River pumping station, a water system landscape project in the administrative office area of Beijing sub-center, has been running steadily for several years and the water level, and storage capacity of Jing River have been basically stable. As the replenishing of reclaimed water and filtered water and the drainage from Jing River to North Canal, the water quality of river changes. The COD_Cr, NH₃-N and TP contents basically reach the surface water quality standard of Class IV. In the future, the water quality of Jing River can be improved by increasing the fluidity of water, improving the quality of the water replenishment, and strengthening long-term supervision.