南四湖流域主要污染河流水质改善效果分析与评价

摘要

南四湖流域水质因南水北调东线工程建设备受关注．根据2005年和2010年枯水期对南四湖流域主要污染河流调查的水质监测数据，对比分析了5年期间南四湖流域主要污染河流的水质改善效果，采用平均综合污染指数法进行了水质状况评价．结果表明，2010年与2005年相比，CODc,，NH3-N，TP，TN的平均浓度下降率依次为54．9％，85．1％，46．3％，45．7％，总体平均浓度下降率为58．0％，平均综合污染指数的总体平均值从11．4下降到4．0，南四湖流域主要污染河流的水质得到了大幅度改善．CODc，，NHs-N，TP，TN的单项污染平均分担率依次为12．1％，11．0％，11．9％，65．O％，TN是流域内的首要污染物．CODc和NH3-N总体接近GB3838-2002中V类水质，DO的总体平均值达到12．48mg／L，初步实现了“有河就有水、有水就有鱼”的目标．建议进一步深化控源工作，重视非点源的控制与治理，有针对性的对主要污染河流和主要污染物进行综合治理．%The water quality of the Nansi Lake basin has gained particular attention on account of the construction of the East Route in the South-to-North Water Transfer Project. This article makes a comparative analysis of the effect of the five years＇ water quality improvement of the main polluted rivers in the Nansi Lake basin, according to the water quality monitoring data of the main polluted rivers in Nansi Lake basin in 2005 and 2010. The result shows that, compared with 2005, the decline rate of the average concentration of CODcr, NH3-N,TP,TN is in order 54. 9%,85.1%,46. 3%,45.7% in 2010, the decline rate of total average concentration is 58.0% and the total average value of the average composite pollution index declines from 11.4 to 4.0. As a result, the water quality of the main polluted rivers in Nansi Lake basin has got significant improvement. The single pollution average share