Wei Huaibin, Rao Yiding, Liu Jing, Wang Yao, Cao Yongxiao
School of Management and Economics, North China University of Water Resources and Electric Power, Zhengzhou, 450046, Henan, China.
School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, 450046, Henan, China.
Sci Rep. 2024 Mar 18;14(1):6492. doi: 10.1038/s41598-024-57201-z.
To explore the impact of expanding Nanyang Sewage Purification Center (NSPC) on the main sewage discharge area of Bai River, we constructed a 2D hydrodynamic-water quality model based on surface water modeling system (SMS) and Mike21. Simulating three sewage discharge conditions in wet, normal, and dry season, we evaluated three indicators (COD, NH-N, and BOD) by the single-factor pollution index and provided recommendations for water environment management. The results showed that, maximum absolute error of water level was 0.08 m, percentage bias coefficient of COD, NH-N and BOD were 19.3%, 16.2% and 23.1%, indicating the SMS and Mike21 coupling model was applicable; water quality of the assessment section were upgraded from the original class IV, V, V (Condition 1) to class IV, III, II (Condition 2) and class IV, III, III (Condition 3) in the wet, normal and dry season, indicating that NSPC's expansion had improved the water quality of the assessment section; as the primary pollutant, BOD concentration in the downstream was lower than the upstream, which was due to the dilution effect of river. Therefore, on the basis of expanding NSPC, we recommend to remediation of BOD by physical, chemical, and biological methods. This study broadens new ideas for the application of Mike21, and provide a reference for the prevention and improvement of river water pollution in urban areas.
为探究南阳污水处理中心（NSPC）扩建对白河主要污水排放区域的影响，我们基于地表水建模系统（SMS）和Mike21构建了二维水动力 - 水质模型。通过模拟丰水期、平水期和枯水期三种污水排放工况，采用单因子污染指数法对化学需氧量（COD）、氨氮（NH - N）和生化需氧量（BOD）三个指标进行评价，并为水环境管理提供建议。结果表明，水位最大绝对误差为0.08 m，COD、NH - N和BOD的百分比偏差系数分别为19.3%、16.2%和23.1%，表明SMS和Mike21耦合模型适用；评价断面水质在丰水期、平水期和枯水期分别从原来的Ⅳ类、Ⅴ类、Ⅴ类（工况1）提升为Ⅳ类、Ⅲ类、Ⅱ类（工况2）和Ⅳ类、Ⅲ类、Ⅲ类（工况3），说明NSPC的扩建改善了评价断面水质；作为主要污染物，下游BOD浓度低于上游，这是由于河水的稀释作用。因此，在NSPC扩建的基础上，建议采用物理、化学和生物方法对BOD进行治理。本研究拓宽了Mike21的应用新思路，为城市区域河流水污染防治与改善提供参考。
