东辽河重点河段氮磷污染特征分析

文章选取吉林省东辽河重点河段为研究对象,通过统计水体2015年至2019年的监测数据,时间分布特征为枯、平水期氮磷污染较重,丰水期污染较轻,说明流域主要污染负荷来自点源。空间分布特征为上游辽河源水质较好,入二龙湖前途经辽源市区,受城市排污影响拦河闸和河清断面水质状况极差,河清断面连续五年为劣Ⅴ类,虽经过二龙湖后水质有所改善,但出省断面四双大桥的水质为Ⅳ类,东辽河干流整体水质状况为中度污染。

This paper selects the key sections of the East Liaohe River in Jilin Province as the research object.Through the monitoring data of the water bodies from 2015 to 2019,the time distributioncharacteristics are:the nitrogen and phosphorus pollution in the flat water period is heavy,and the pollution in the abundant water period is lighter,indicating that the main pollution load in the basin comes from the point source.The spatial distribution characteristics are:the quality ofthe upstream of the LiaoheRiver'ssource water is better,but that of the water around the river gate and section turns worse due to the influence of urban sewage.Although water quality improvesafter running through the Erlong Lake,the water quality of the four double bridgesbeyond the provincial section is graded as IV class,andthe overall water quality of the East Liaohe River's main stream is medium pollution.