复合水平流人工湿地中水生植物净化效果研究

采用2块结构相同的复合水平潜流人工湿地,选用不同的植物组合处理农村富营养化水体,分析2块湿地的净化效果,结果表明:2个复合水平流人工湿地对于TN和NH3-N的去除效果差异明显,而对于COD和TP的去除效果差异不明显。对COD、NH3-N、TN和TP的去除率,种植灯心草—菖蒲和美人蕉—风车草的1号复合湿地分别为29.4%、35.7%、43.6%和65.9%;种植香蒲—美人蕉和美人蕉—风车草的2号复合湿地分别为30.6%、49.2%、58.1%和64.5%;2个湿地通过植物吸收、存储氮量仅占湿地总氮的去除量的8.13%和10.72%,但是植物的存在间接地影响微生物硝化/反硝化,对提高湿地氮去除率具有重要作用。湿地通过植物吸收、存储磷量占湿地总磷的去除量的7.59%和10.25%。湿地脱磷的主要贡献来自基质,而植物的贡献较小。

Study on Purification Effect of Aquatic Plants in Complex Level Flow Constructed Wetland

Used the two plots of complex level flow constructed wetland which had the same structure and selected different combinations of plant dealing with eutrophic water in rural areas , the purifying effects were analyzed. The results showed that the differences of purification effects of the two plots of complex level flow constructed wetland for TN and NH 3 -N were significant but not significant for COD and TP. The removal rates of COD , NH 3 -N , TN and TP were 29.4% , 35.7% , 43.6% and 65.9% respectively in the No.1 complex wetland which planted rush- Acorus calamus and Canna indica -windmill grass. In the No.2 complex wetland which planted Typha latifolia - Canna indica and Canna indica -windmill grass , the removal rates of COD , NH 3 -N , TN and TP were 30.6% , 49.2% , 58.1% and 64.5% respectively. The two plots of wetland stored nitrogen accounted for only 8.13% and 10.72% of the total nitrogen removal in wetlands by plants absorb. However , the presence of plants indirectly affected microbial nitrification/ denitrification which played an important role to improve wetland nitrogen removal rate. The wetland stored phosphorus accounted for only 7.59% and 10.25% of the total phosphorus removal in wetlands by plants absorb. The main contributions of wetlands dephosphorization was from the substrate , and smaller form the plants.