2014年溧阳市河道水体总磷变化分析

Analysis of total phosphorus fluctuation in the rivers of Liyang in 2014

溧阳市地处太湖流域上游,境内河流都汇入太湖。为保证太湖水质安全,溧阳市环境监测站对全市主要河流开展常年定期水质监测。利用这些河流14个断面2014年全年水质监测数据,对可导致水体富营养化的水中总磷含量进行了时空特征分析。结果显示溧阳河流大部分水样总磷达到太湖流域水质考核要求,但个别断面在2月和7月出现超标现象。利用GIS技术,分析了总磷超标断面的磷元素主要来源区与类型,提出了磷源减排,富磷水处理以及总磷截留三类基本治理措施。

Liyang is located in Taihu Lake Basin, and all rivers in this area fall into Taihu Lake. In order to ensure the safety of Taihu Lake water quality, Liyang environmental monitoring centre measures the water quality of main rivers of the city regularly. Based on the water quality monitoring data from the rivers at 14 different sections during 2014, this study explores the fluctuation characteristics of the major factors of total phosphorus （TP） which could cause water eutrophication of Taihu Lake. Most of the monitoring data indicate that TP in Liyang surface water meets Taihu Lake water quality safety standards, but a few sections in February and July have ex- cessive content of TP. This study has analyzed the sources and types of TP, and pointed out three basic treatment strategies, including phosphorus emission reduction, treatment of rich phosphorous water, and construction of phosphorous reservoir.