不同植物湿地系统对高盐再生水的除氮能力比较

以氮营养物为去除目标，研究了高盐再生水景观河道内的生态砾石床及4种水生植物湿地床的除氮效果。结果表明，单纯的砾石床对高盐再生水的除氮能力比水生植物湿地床的差，在水葱、美人蕉、三棱草和芦苇等4种水生植物湿地床中，以芦苇床的除氮效果最佳；4种植物湿地床对硝态氮的去除效果最好，其次是对总氮的去除效果，对氨氮的去除效果则较差；进水中总氮和氨氮负荷的变化对水生植物湿地床的除氮效果有一定的影响。

Nitrogen Removal Performance of Different Aquatic Macrophytes Wetland in Reclaimed River Channel

In achieving goals of nitrogen nutrients removal, the capacity of the removal was studied in four kinds of aquatic macrophytes wetlands in highly salty reclaimed river channel. The results show that the aquatic macrophytes, including Scirpus tabernaernontani Gmel, Canna indica, Cyperus iria L. and Phragmites australis, have high nitrogen removal efficiencies, in which the Phragmites australis has the best performance. All four aquatic macrophytes wetlands have similar purification characteristics with high removal rates of nitrate, average removal of total nitrogen and low removal of ammonia nitrogen. The purification efficiencies of total nitrogen and ammonia increase gradually with the increase of influent nitrogen concentration. Gravel bed has lower nitrogen removal efficiency than the aquatic macrophytes wetland.