MDI一体化项目排污口对长江水质影响的预测

以MDI一体化项目排污口为研究对象,采用二维水质数学模型,预测了不同水位条件下,MDI一体化项目各企业排放的废水污染物对长江下游水体水质的影响。预测结果表明,在达标排放前提下,除挥发酚、硝基苯外,各污染物对排污口下游长江水体水质影响较小,长江水体水质基本满足GB 3838—2002《地表水环境质量标准》中Ⅲ类标准要求;挥发酚、硝基苯在排污口下游会产生一定的超标污染带,岸边5 m以外,下游120 m以远即满足《地表水环境质量标准》中Ⅲ类标准要求,不会对下游水质安全造成影响。

Prediction of the Impact of Wastewater Discharged by MDI Integrated Projects on Water Quality of Yangtze River

Using a two-dimension water quality prediction model,the research predicts the influence of the pollutants from the wastewater discharged by MDI integrated projects on the Yangtze River water in different water level conditions.The results show that the pollutants affect the Yangtze River water at the lower level of drainage outlet less,except of volatile phenol and nitrobenzene.The water quality of Yangtze River meets Ⅲ level of Environmental quality standards for surface water(GB 3838—2002).Volatile phenol and nitrobenzene can lead to over-standard pollution zones in the downstream of drainage outlet,but the quality of water outside 5 meters away from the shore or outside 120 meters away from the drainage outlet meets Ⅲ level of Environmental quality standards for surface water,and so volatile phenol and nitrobenzene do not threaten the quality of downstream water.