长春市南湖水质状况分析

Investigation on the water quality of Nanhu Lake in Changchun City

对1999～2004年长春市南湖游泳区、湖心区、荷花区NH3-N,BOD5,CODCr,TN,TP等5项水质指标的监测资料进行统计分析和评价.结果显示,南湖在经过2000～2002年的底泥疏浚治理后,水质状况有了显著的改善,特别是荷花区水域的一些监测指标已经达到或接近GB3838-2002Ⅲ类水体标准值;但游泳区和湖心区的水质仍表现出富营养化,水体中TP,TN超标现象较为严重.建议在湖泊水体污染治理过程中,在截断外源污染的前提下,最好采取生态治理和工程治理等多种措施相结合的办法。

Water quality in swimming area, lake center and water lily area of Nanhu lake in Changchun was statistically analyzed based on data of five water quality indices, including NH3-N, BOD5 , CODe,, TN, and TP monitored from 1999 to 2004. Results show that the water quality of Nanhu lake in Changchun is significantly improved after sediment dredging from 2000 to 2002, and the indices of water quality in water lily area even reach or approach to the third level of GB3838-2002. But there is still eutrophication in the swimming area and lake center, and TP and TN in the water seriously exceed the normal level. It is suggested that besides the truncation of exotic pollution, measures such as ecological and engineering method could be adopted to control the pollution.