洪泽湖水质特征分析及评价

Analysis and assessment on water quality of Hongze Lake

洪泽湖是我国第四大淡水湖,是“南水北调”东线工程中重要的过水通道和调水泵站,其自身的水环境质量必将影响北调水体的质量。本文分析了2014-2017年7月洪泽湖水质的变化趋势,重点研究洪泽湖水质的年际变化规律和年内水质指标分类。结果显示:(1)洪泽湖水体的整体水质属于《地表水环境质量标准》Ⅳ类水质,水体的主要污染物质为TN、TP、COD;(2)洪泽湖年内污染严重月份为3、4月份;(3)洪泽湖污染最为严重的是东南部和西南部湖区,有些水体已经归为劣Ⅴ类水体。

Hongze Lake, the fourth largest fresh lake in China, works as an important water channel in the eastern route of the South-to-North Water project (the Project). Consequently, it affects greatly the water quality for the diverted water of the Project. Based on monthly investigation for 12 sampling points over Hongze Lake, the water quality of Hongze Lake was evaluated. Results show that (1) water quality of the whole Hongze Lake was at Class IV according to GB 3838 -2002 standards with high concentrations in TN, TP and COD;(2) annually, the worst water quality in Hongze Lake occurred in March and April;(3) spatially, the worst water quality in Hongze Lake was found in the south-east and south-west lake areas, where the water quality was at Class V according to GB 3838 -2002 standards.