山西汾河复流前后水环境承载能力分析

在对汾河水质、入河排污量监测的基础上,选取计算模型及相关参数,以掌握汾河复流前后水环境承载能力为主要目的,以各水功能区为基本计算单元,分析计算水功能区不同来水条件下的水域纳污能力,进而提出汾河复流后各行政分区的污染物限排总量及污染物削减率。结果表明:复流后各功能区COD和NH3-N限制排污总量分别为25 139 t/a和1 158 t/a,污染物削减量分别为24 704t/a和7 857 t/a,平均削减率分别为49.6%和87.2%。若各入河排污口达标排放后,COD、NH3-N仍要削减15 936 t/a和4 356 t/a。

Analysis of water environmental carrying capacity before and after flow recovery in Fenhe River in Shanxi Province

Based on monitoring data of the water quality and pollutant discharge of the Fenhe River, a calculation model and relevant parameters were selected to study the water environmental carrying capacity before and after flow recovery in the river. The water function zone was selected as the basic calculation unit, in order to analyze the water environmental capacity under different water intake conditions. Then, the discharge limit and reduction rate of pollutants in the administrative areas before and after flow recovery in the Fenhe River were calculated. The results show that the discharge limits of pollutants were 25 139 t/a and 1 158 t/a, the reduction amounts of pollutants were 24 704 t/a and 7 857 t/a, and the average reduction rates were 49.6% and 87.2%, respectively, for COD and NH3-N in the function zones after flow recovery. If the pollution discharge met the standard at all the discharge outlets of the river, the reduction amounts of COD and NH3-N would be 15 936 t/a and 4 356 t/a, respectively.