江苏省入太湖河道污染物分析

Analysis of pollutants in rivers entering Taihu Lake in Jiangsu Province

为了对太湖的水资源开发利用和水污染治理提供参考数据,对1998—2009年江苏省环太湖河道的入湖水量、入湖污染物量和入湖水质进行计算与分析。结果表明,江苏省环太湖河道多年平均入湖水量为70.6亿m3,主要入湖河道的NH3-N、TP、TN、CODMn平均入湖量分别为1.37万t、1360t、2.63万t和3.77万t,环太湖河道超Ⅲ类水标准的断面占断面总数的71.5%～95.3%,其中1998—2004年超Ⅲ类水质的断面呈上升趋势,水质逐渐恶化,而2005—2009年超Ⅲ类水质的断面渐趋下降,水质有所改善。

The water quality, water quantity, and pollutants in the rivers entering Taihu Lake from 1998 to 2009 were calculated and analyzed, in order to provide reference data for water resources exploitation and utilization, and water pollution control in Taihu Lake. The results show the following： The multi-year average volume of the water flowing into Taihu Lake was 7.06 billion m^3. The average volumes of NH3-N, TP, TN, and CODMn in the rivers entering the lake were 13 700 t, 1 360 t, 26 300 t, and 37 700 t, respectively. The river sections that had water quality exceeding the Class III standard accounted for 71.5% to 95.3% of the total number, and they showed an increasing trend with deteriorated water quality during the period from 1998 to 2004, whereas a decreasing trend was observed during the period from 2005 to 2009, when the water quality in these sections was improved.