不同挺水植物构建的湿地处理轻度污染河水氮素转化与平衡
Nitrogen transformations and balance in constructed wetlands for slightly polluted river water treatment using different macrophytes.
机构信息
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, People's Republic of China.
出版信息
Environ Sci Pollut Res Int. 2013 Jan;20(1):443-51. doi: 10.1007/s11356-012-0996-8. Epub 2012 Jun 16.
Nitrogen removal processing in different constructed wetlands treating different kinds of wastewater often varies, and the contribution to nitrogen removal by various pathways remains unclear. In this study, the seasonal nitrogen removal and transformations as well as nitrogen balance in wetland microcosms treating slightly polluted river water was investigated. The results showed that the average total nitrogen removal rates varied in different seasons. According to the mass balance approach, plant uptake removed 8.4-34.3 % of the total nitrogen input, while sediment storage and N(2)O emission contributed 20.5-34.4 % and 0.6-1.9 % of nitrogen removal, respectively. However, the percentage of other nitrogen loss such as N(2) emission due to nitrification and denitrification was estimated to be 2.0-23.5 %. The results indicated that plant uptake and sediment storage were the key factors limiting nitrogen removal besides microbial processes in surface constructed wetland for treating slightly polluted river water.
不同类型污水在不同人工湿地中的脱氮处理过程往往不同，各种途径对氮去除的贡献尚不清楚。本研究以轻度污染河水为处理对象，考察了湿地微宇宙的季节性氮去除和转化以及氮平衡。结果表明，不同季节的总氮去除率存在差异。根据质量平衡方法，植物吸收去除了总氮输入的 8.4-34.3%，而沉积物储存和 N(2)O 排放分别贡献了氮去除的 20.5-34.4%和 0.6-1.9%。然而，由于硝化和反硝化作用导致的其他氮损失（如 N(2)排放）的百分比估计为 2.0-23.5%。结果表明，在表面人工湿地处理轻度污染河水时，除微生物过程外，植物吸收和沉积物储存也是限制氮去除的关键因素。
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