2007年京杭大运河扬州市区段和里下河段水质变化比较及对策的研究

Measures and Comparison of Changes on Water Quality of the Beijing-Hangzhou Grand Canal in Urban Areas of Yangzhou and Lixiahe in 2007

通过对京杭大运河扬州市区段和里下河段pH、COD、DO、BOD、氨氮及石油类指标监测，分析2007年水质变化及主要污染物。得出京杭大运河扬州段主要为有机污染，里下河水质优于市区。大运河春秋季水质相对较差，夏、冬季相对好转。市区比里下河pH低0．5左右，COD含量高0．5～0．3mg·L^-1，DO含量高0．8mg·L^-1，春季BOD，含量高2．3mg·L^-1，氨氮含量高0．44mg·L^-1。因此，市区段春、秋季应重点针对削减BOD5、COD、氨氮进行水污染治理。里下河段春季针对降低COD进行治理，秋季针对降低COD、BOD5氨氮进行水污染治理。两区在夏季重点应针对提高水体中DO含量进行治理。提出的植物治理技术及管理对策措施，不仅为扬州到2010年建成生态市不断改善水环境质量，提供技术支撑和决策依据，也为如何提高具有跨流域、区域和内城河多重功能的水体水质提供启示。

The paper analysised the water quality changes and the major pollutants for the Beijing - Hangzhou Grand Canal in urban areas and Lixiahe iN2007 by the monitoring of pH, COD, DO, BOD, ammonia and oil indicators. The result was organic pollution for the Beijing - Hangzhou Grand Canal in urban and the water quality in Lixiahe was better than in urban areas. The Grand Canal water quality was bad in spring and autumn, on the contrary, relative improvement in summer and winter. In addition, the pH in urban was lower than 0. 5 in Lixiahe, COD high of 0.5 -0.3 mg · L^-1, DO high of 0. 8 mg · L^-1. More than, BOD5 high of 2.3 mg · L^-1 and ammonia high of 0. 44 mg · L^-1 in spring. Therefore, the urban area should focus on cutting BOD5, COD, ammonia in the spring and autumn. Lixiahc should cut COD in the spring and reduce the COD, BOD5, ammonia in autumn. Both rivers should focus on improving the DO of water in the summer. In a word,the paper advises that the measures of plant - technology is good way both improving water quality for the realization of the eco - city in 2010 and provide the way of how to improve Water quality for cross - river basin, regional and multi - function rivers.