固城湖水环境污染状况与来源分析

对2001~2011年固城湖水环境污染状况评价与时空变化特征分析的基础上,探讨了固城湖的特征污染物及污染来源。结果表明,固城湖水质污染的主要超标因子为TN和TP;总体水质呈现先恶化再改善的趋势,污染由拦河网水域向小湖区水域扩散;固城湖湖体水质基本上劣于水环境功能区划要求;固城湖特征污染物为COD+M n、NH4-N、TN、TP、BOD 5;富营养化程度不断加重,之后又有所改善;氮磷污染的主要来源是水产养殖污染。

Water Environmental Pollution Status and Pollution Source Analysis of Gucheng Lake

On the basis of evaluation of water environmental pollution and analysis of the temporal-spatial variation characteristics of Gucheng Lake from 2001 to 2011,the particular pollutants and pollutant sources of the Lake were discussed.The results showed that with regard to the water pollutants in the Lake,the main factors exceeding the standard limits were TN and TP.The overall water quality was deteriorated first and then improved.The pollution was dispersed from block river water areas to small lake regions.The water quality of the Lake was basically inferior to that required for the water environment function zoning.The particular pollutants in the Lake were CODMn,NH4＋-N,TN,TP and BOD5.Eutrophication of the Lake got worse increasingly but improved afterwards.The main source of nitrogen and phosphorus pollution was aquaculture.