基于Mike21模型的鸭绿江支流排污口水质影响分析  

Analysis of the Impact of Sewage Discharge on the Water Quality of Yalu River Tributaries Based on the Mike21 Model

作　　者：王愿珠 葛长成 WANG Yuan-zhu;GE Chang-cheng(Central Southern Safety&Environmental Technology Institute Company Limited,Wuhan 430061,Hubei,China;Beijing Huiqing Smart Water Company Limited,Beijing 100020,China)

机构地区：[1]中南安全环境技术研究院股份有限公司,湖北武汉430061 [2]慧清智慧(北京)水务有限公司,北京100020

出　　处：《湿地科学与管理》2024年第5期59-64,共6页Wetland Science & Management

摘　　要：识别排污口尾水排放对周边水体的影响范围对防范和处理水污染事故具有重要意义。本研究采用MIKE21模型建立水动力模型,通过耦合对流扩散模型研究分析改扩建项目入河排污口设置对鸭绿江支流水质的影响程度和范围。结果表明:在最不利的水文条件下(保证率为90%最枯月),排污口正常排放时,COD浓度和氨氮浓度均满足《地表水环境质量标准》(GB3838-2002)中的Ⅲ类限值标准;排污口事故排放时,排污口至下游边界约5 000 m的河段COD和氨氮浓度均超出地表水Ⅲ类限值标准。为防止水污染事故发生,在实际运行中应设置事故应急池,污水处理站无法正常处理尾水时,应将尾水存放至事故池,严禁直接排放入河。该研究成果可为鸭绿江支流水环境管理提供依据,也可为沿岸排污口设置及优化提供一定的理论指导。It is of great significance to identify the scope of impact of sewage discharge on the surrounding water for preventing and dealing with water pollution accidents.This study simulated the impact of sewage discharge on the water quality of the Yalu river tributary of the sewage treatment station of renovation and expansion project by hydrodynamic and transport module of the MIKE21 model.The results showed that under the most unfavorable hydrological condition(with a guarantee rate of 90% in the driest month),under normal condition which tail water was treated,both the concentration of COD and ammonia met the Class Ⅲ in the Environmental Quality Standards for Surface Water(GB3838-2002);Under abnormal condition of untreated tail water,the concentration of COD and ammonia in the river exceeded the Class Ⅲ for surface water from the sewage discharge to the downstream boundary which was approximately 5 000 m.In order to prevent water pollution accidents,emergency pools for accidents should be set up in actual operation.When the sewage treatment plant cannot handle the tail water normally,the tail water should be stored in the accident pool and it is strictly prohibited to discharge directly into the river.This research results provide a basis for the water environmental management of the Yalu river branches,and also provide a theoretical guidance for the setting and optimization of coastal sewage discharge.

关 键 词：MIKE21 入河排污口 水质模型 二维水动力学 鸭绿江 

分 类 号：X522[环境科学与工程—环境工程]