利用耐盐沉水植物控制滨海再生水景观河道的富营养化研究

Studies on Controling Eutrophication of Recycled Water Landscape River in the Coastal Area by Submerged Aquatic Vegetation Ruppia maritima

研究了由广盐性沉水植物川蔓藻（Ruppia maritima）构建的沉水植被系统对滨海再生水景观河道的富营养化控制。实验室静态试验与工程现场中试研究结果表明；由单一广盐性沉水植物川蔓藻构建的沉水植被系统对含盐量7000～13000mg几的再生水中的氮和磷都有较高的去除率，当河道川蔓藻的生物量达4627gFw／m^2时。再生水体中总氮和总磷的去除率分别达到74．6％和85．4％。出水氮磷浓度达到了《城市污水再生利用景观环境用水质》（GB／T18921-2002）的标准。泰达再生水河道中川蔓藻的生物量与河道水体中的叶绿素a存在显著的线性负相关。因此，在景观河道之前先构建一个川蔓藻沉水植被系统．对于利用再生水恢复与重建滨海湿地，并控制水体富营养化有重要作用。

The constructed submerged aquatic vegetation system with Ruppia maritima was examined for its purification effect of the recycled water in the coastal scenic environment. The purpose of this study is to explore a new method to control eutrophication of the recycled water. Laboratory and field studies showed that the constructed submerged aquatic vegetation system with Ruppia maritima had a high efficiency of the removing total N and P from the recycled water with high salinity （TDS = 7 000-13 000mg/L）. The field study recorded removal rates of 74.6 % and 85.4 % for the total N and P at a biomass of Ruppia maritime of 4 627 g Fw/m^2. The Chlorophyll-a of the recycled water and biomass of Ruppia maritima had a significant negative linear correlation. It is suggested that the constructed submerged aquatic vegetation system with Ruppia maritima should be considered for controlling eutrophication of recycled water with high salinity used in the coastal scenic environment.