瓯江引水工程对温瑞塘河水氮磷含量的影响

The Influence of Diversion Project on the Concentration of Nitrogen and Phosphorus in Wenruitang River

瓯江引水工程是改善温瑞塘河生态环境的一项重要措施,然而瓯江江水的输入带来了大量的悬移质泥沙。文章通过实验室模拟,研究不同含沙量条件下,江水携带的悬移质泥沙对塘河河水中氮、磷的动力学吸附特征及沉降净化作用。结果表明:悬沙对河水中氮、磷的动力学吸附分别需8 h和12 h达到平衡,但吸附效果不明显。含沙量为0.5 kg/m3的水体中悬沙对氮、磷的净吸附比仅分别为5.9%、2.5%。在静水环境下,泥沙沉降对总磷的携带作用强于总氮,且能吸附少量水相磷。泥沙沉降携带作用在高含沙量水体中较明显。

The diversion project is an important measure to improve the ecological environment of Wenruitang River.However,the water from Ou River brings a large quantity of suspended sediments.Therefore,simulated experiments are conducted to study the influence of suspended sediments on kinetic absorption characteristics and purification effect of nitrogen and phosphorus in river water.The results indicate that the kinetic adsorption effect of nitrogen and phosphorus in the river water by suspended sediments is not obvious.In the mix water which the concentration of suspended sediments is 0.5 kg/m3,the net adsorption ratio of nitrogen and phosphorus is only 5.9% and 2.5%,respectively.While during the process of sediment deposition,suspended sediments can carry a certain amount of total nitrogen and total phosphorus out of the water,but the influence of absorbing dissolved nitrogen and phosphorus in the water is small.