石佛寺人工湿地对水体中富营养物质去除效果分析

以石佛寺人工湿地为研究对象，通过对湿地内各项水体富营养指标监测数据的分析，研究人工湿地对辽河水中富营养物质的去除效果。结果表明:2009年石佛寺人工湿地建成以来，水库出口处水体富营养情况明显好于湿地建成前，其中DO含量明显增加，有机物COD_Mn，BOD₅及营养盐NH₃-N，TN和TP的含量有显著降低。辽河水流经湿地内部，部分时段水体中DO含量的变化率出现负值，但湿地出口处DO含量均达到7.0 mg/L以上；湿地对有机物及营养盐具有良好的去除效果，且去除效果在汛期好于非汛期，2009—2011年的去除率均达到正值，对有机物COD_Mn，BOD₅的最大去除率分别可达到48.3%，65.8%，对营养盐NH₃-N，TN和TP的最大去除率分别可达到78.1%，88.2%和72.0%；2012—2013年部分时段的去除率出现了负值，说明随着湿地运行时间的延长，植物死亡后的腐烂分解会导致富营养物质的二次释放。

Analysis on the Removal Efficiency of Eutrophic Materials in Shifosi Constructed Wetland

We took the Shifosi constructed wetland as research site and examined the removal efficiency of eutrophic materials in this constructed wetland in Liao River by long-term monitoring of wetland water body eutrophic indexes. The result showed that the eutrophication condition of the water of the reservoir outlet was much better than that before the construction of the wetland since the construction of Shifoshi constructed wetland in 2009. Therein, the DO content increased obviously while the contents of organism COD_Mn, BOD₅ and nutrients(NH₃-N, TN and TP) decreased significantly. Liao River flows through the wetland and the change rate of DO content of the water body at some stages appeared negative but the DO content of the wetland outlets reached above 7.0 mg/L. Wetland has good removal efficiency of organism and nutrients, and the removal efficiency of flood season is better than that of non-flood season with the removal rate reaching positive value during the period from 2009 to 2011. The maximum removal rates of wetland on organism COD_Mn, and BOD₅ reached up to 48.3% and 65.8%, respectively, and maximum removal rates of nutrients such as NH₃-N, TN and TP reached up to 78.1%, 88.2% and 72.0%, respectively. The removal rates at some stages appeared negative in 2012 and 2013, which indicated that the decomposition of dead plants could lead to the secondary release of eutrophic matter with the extension of the runtime of wetland.