【摘要】 排污口的设置往往会导致附近水域出现水质超标现象，尤其对于城市内河道，涉及群众用水健康及对周边敏感区域的影响，需要对排污口排放污染物的影响情况进行研究。以南方某城市污水处理厂排污口为例，采用MIKE21二维水质模型模拟了6种工况下COD、NH₃-N两种入河污染物对下游水体的影响情况。结果表明，正常排放时COD、NH₃-N对下游水体影响较小，水质基本满足排污口所在河段水功能区水质要求，事故排放时，对下游造成10km以上的影响。模拟结果基本可以反映排污口排放污水对河道下游水质的影响情况，可为入河排污口排放污染物影响预测提供参考依据。更多还原

【Abstract】 The setting of sewage outlets often result in water quality exceeding standard in nearby water bodies, especially for urban river courses, involving the health of water use by the masses and the impact on the surrounding sensitive areas. Therefore, it is necessary to study the impact of pollutants discharged from the sewage outlets.Taking the sewage outlet of a typical southern sewage treatment plant as an example, the MIKE21 two-dimensional water quality model was used to simulate the impact of COD, NH₃-N and other pollutants entering the river on the downstream water body under six working conditions. The results showed that COD and NH₃-N have little impact on the downstream water body under normal discharge, and the water quality basically meets the water quality requirements of the water function zone of the river section where the sewage outlet is located. In the case of accidental discharge, it will cause an impact of more than 10km downstream. The simulation results can basically reflect the impact of sewage discharged from the sewage outlet on the water quality of the downstream of the river, and can provide a reference basis for the prediction of the impact of pollutants discharged of the sewage outlet into the river.更多还原