Analysis of pollutants in rivers entering Taihu Lake in Jiangsu Province

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 m3.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.