Characteristics of pollutant sources of Caoqiao River in Taihu Lake Basin.

Based on analysis of the main pollutant source composition and pollution characteristics of the Caoqiao River in the Taihu Lake Basin,the total amount of pollutants into the river was calculated and corrected.The results showed that the total amount of chemical oxygen demand entering the Caoqiao River was(1639.9)(t/a),mostly from industrial pollution and urban life pollution.The total amount of ammonia nitrogen entering the Caoqiao River was 174.6(t/a),mostly from agricultural non-point source pollution and industrial pollution.The amounts of total nitrogen and total phosphorus entering the Caoqiao River were 491.0 and 34.7(t/a) respectively,mostly from agricultural non-point source pollution and urban life pollution.In view of the complex characteristics of the river water system in the region,guest water is treated as the pollution source.The total amount of guest water was checked;this provides a foundation for effectively improving water environmental quality in the small river basin.