【作者】 张宇； 何苗； 周圆；

【Author】 Zhang Yu;He Miao;Zhou Yuan;Kunming Environmental Monitoring Center;

【机构】 昆明市环境监测中心；

【摘要】 入湖河流是污染物进入湖泊的主要通道,在河道末端建立河口前置库可实现对河流污染物的有效削减。通过对建立在滇池草海新运粮河、老运粮河、王家堆渠3条入湖河道汇合进入的河口前置库进行研究,结果表明前置库对入湖河道水质净化作用明显,水体中氮磷等营养物质在流经前置库后均呈下降趋势。前置库对总磷（TP）、总氮（TN）、氨氮（NH₃-N）的去除率最高分别达76. 9%、82. 6%、88. 5%。对总氮（TN）、氨氮（NH₃-N）的去除效果雨季高于旱季,对磷的去除效果雨季和旱季相差不明显,旱季略高于雨季。经过前置库后,单项指标总磷（TP）、氨氮（NH₃-N）水质类别可以提升1～4个级别,基本达到Ⅳ类和Ⅲ类。总氮（TN）由于进水含量较高,水质类别仍然为劣Ⅴ类。更多还原

【Abstract】 Rivers flowing into lake are the main way for pollutants to enter the lakes,building estuary pre-dam at the end of river can effectively reduce the pollutants in river. By investigated the estuary pre-dam built at the Caohai of Dianchi lake,where the Xinyunliang river,Laoyunliang river and Wangjiadui river merge and flow in. Results show that the effects of the system were significant on purifying the water in river,the nutrition and phosphorus reduced when water flew the estuary predam system. The highest removal rate of total phosphorus（ TP）,total nitrogen（ TN）,ammonia nitrogen（ NH₃-N） were76. 9%,82. 6%,88. 5%. The purification effect of total nitrogen（ TN） and ammonia nitrogen（ NH3-N） in rainy seasons was better than that of in dry seasons. The purification effect of phosphorus was almost the same between rainy seasons and dry seasons,and the latter was slightly better than the former. After flowing through estuary pre-dam,the system can raise the water grades which is the single index of total phosphorus（ TP） and ammonia nitrogen（ NH₃-N） for 1 to 4 levels,basically reached Grade Ⅲ—Ⅳ. The water grades of total nitrogen（ TN） was still worse than Grade V,because of a high content of total nitrogen（ TN） in influent.更多还原