Abstract:

NH₄⁺-N purification experiments were carried out in vertical subsurface flow constructed wetlands respectively planting with phragmites communis, calamus, cyperusalternifolius, and canna. The influence of temporal and spatial characteristics on nitrogen transformation of the plants in upper and lower layers setting in the constructed wetlands were investigated. The result showed that the elimination of NH₄⁺-N and TN in various types of constructed wetlands were obviously rapid at 4 and 6 days, respectively, on the condition of carbon-poor environment and the content of NH₄⁺-N in the culture liquid was about 40 mg/L. During the quick elimination period, the removal efficiencies of NH₄⁺-N and TN were 5.28 to 7.05 times and 4.15 to 15.91 times higher than that in subsequent experiment among different constructed wetlands. The accumulation of NO₃^--N existed in phragmites communis, calamus and cyperusalternifolius, but canna, which occurred from the 1st day to the 12th day. The cumulant order of NO₃^--N was as follows, phramites commuis>calamus>cyperusalternifolius, and the maximum concentration is between 0.70 and 2.60 mg/L.

Key words: constructed wetlands, vertical subsurface flow, nitrogen removal

摘要：

在栽种有芦苇、菖蒲、伞草和美人蕉的垂直潜流人工湿地中进行NH₄⁺-N净化实验，研究不同植物在人工湿地上下层中氮素形态转化的时空特征。实验结果表明：在NH₄⁺-N初始质量浓度为40 mg/L的贫碳进水情况下，各类型人工湿地中均存在NH₄⁺-N和TN的快速消除期，分别为4 d和6 d。快速消除期内，不同类型人工湿地中，NH₄⁺-N和TN的去除负荷分别可达到后续实验持续时间内的5.28~7.05倍和4.15~15.91倍。除美人蕉湿地外，芦苇、菖蒲和伞草湿地均发生了NO₃^--N的积累，积累期均集中在实验开始的第1 d至第12 d，积累程度分别为芦苇>菖蒲>伞草，积累质量浓度最大值为0.70~2.60 mg/L。

关键词: 人工湿地, 垂直潜流, 脱氮

CLC Number: 

• X703.1