云南抚仙湖湖滨带复合湿地的脱氮效果分析

Nitrogen Removal Efficiency of Integrated Constructed Wetland in Riparian Zone of Fuxian Lake

马料河是抚仙湖北岸水量较大的入湖河流,其水质较差,为保护抚仙湖的水环境,在湖北岸的湖滨带修建了复合型人工湿地。该湿地分为生物强化沉淀池、水平潜流湿地和表面流湿地3个净化功能区,主要收集马料河集水域内的农田径流污水和澄江县城部分生活污水。监测表明,该复合型人工湿地的脱氮效果比较明显,对污水中硝酸盐氮、氨氮和总氮的平均去除率分别为61.9%、55.9%、40.3%;潜流人工湿地和生物强化沉淀池对氨氮的去除效果不佳,而表面流人工湿地则脱氮效果较好。最后,提出了强化脱氮的一些措施。

To protect the water environment of Fuxian Lake, an integrated constructed wetland was built in the riparian zone of Fuxian Lake for the treatment of water from Maliao River. The integrated constructed wetland is divided into three purifying sections, including biological enhanced sedimentation tank, leveling subsurface constructed wetland and surface constructed wetland. The run-off sewage from farmland and some sanitary sewer from Chengjiang County in the gathering ground of Maliao River, the river of inlet port of Fuxian Lake, are collected. The monitoring results show that the integrated constructed wetland has good performance in removing nitrogen, the average removal rates of NO3^- - N, NH3 - N and TN are 61.9%, 55.9% and 40.3% respectively. In the integrated constructed wetland, the effect of nitrogen removal of the subsurface flow wetland and the biological settling tank is not good as that of the surface flow constructed wetland, which means that surface constructed wetland is the main functional section of the integrated constructed wetland. In the end, some measures for strengthening the nitrogen removal were presented.