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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第11期    总第279期    2017年11月

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文章编号:1672-7207(2017)11-2859-07
4种湿地植物对复合垂直流人工湿地N2O排放的影响
蒋旭瑶1,田云飞1,黄德英2,郑潇威1,祝栋林3,张继彪1

(1. 复旦大学 环境科学与工程系,上海,200433; 2. 复旦大学 化学系,上海,200433; 3.江苏省工程咨询中心,江苏 南京,210003)

摘 要: 采用静态箱 -气相色谱法对4种植物(菖蒲、美人蕉、风车草和水葱)的复合垂直流人工湿地N2O排放通量进行观测,并检测进出水总氮(TN)指标。研究结果表明:4种植物湿地TN去除率随着季节的变化趋势基本相同,先上升后波动下降,12月份和1月份达到最低,且风车草湿地TN去除率较高,为77.98%;菖蒲、水葱湿地的下行池排放通量比上行池的高,美人蕉湿地上行池排放通量比下行池的高,风车草湿地上、下行池排放量相差不大;风车草、菖蒲、美人蕉和水葱这4种植物湿地的N2O平均排放通量分别为162.80,99.35,84.62和82.56 μg/(m2·h);复合垂直流人工湿地系统总体上表现为大气中N2O的排放源,只有水葱湿地在12月份下半月表现为N2O的弱吸收汇;菖蒲、美人蕉和水葱湿地的TN去除负荷与N2O平均排放通量的比值KTN/N2O随时间变化较大,风车草湿地KTN/N2O变化相对平缓,且较低;菖蒲、美人蕉湿地在11月份上半月以及水葱植物在12月份上半月的KTN/N2O较高,即在这些时间段内人工湿地菖蒲去除污水中相同量的TN,排放出的N2O较少;在复合垂直流人工湿地污水处理植物选种中,菖蒲和美人蕉植物较合适。

 

关键字: 复合垂直流人工湿地;湿地植物;N2O排放通量

Effect of four kinds of wetland plants on N2O emission from integrated vertical constructed wetland
JIANG Xuyao1, TIAN Yunfei1, HUANG Deying2, ZHENG Xiaowei1, ZHU Donglin3, ZHANG Jibiao1

1. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; 2. Department of Chemistry, Fudan University, Shanghai 200433, China; 3. Jiangsu Engineering Consulting Center, Nanjing 210003, China

Abstract:Four kinds of wetland plants named Acorus calamus L, Canna indica L, Scirpus validus Vahl and Cyperus alternifolius L were cultivated to evaluate N2O from integrated vertical constructed wetlands with static chamber-gas chromatograph. The results show that TN removal efficiencies for four plants are basically similar. TN removal efficiency increases from August and then decreases. The lowest TN removal efficiency is obtained in December and January. The best TN removal efficiency of these four kinds of wetlands is 77.98% when planted with Cyperus alternifolius L.N2O emissions from Acorus calamus L, and Scirpus validus Vahl are higher from downflow tanks than that from upflow tanks.But N2O emissions from Canna indica L is lower from downflow tanks than that from upflow tanks. Cyperus alternifolius L has the highest average N2O emission of 162.80 μg/(m2·h), followed by Acorus calamus L of 99.35 μg/(m2·h), Canna indica L of 84.62 μg/(m2·h) and Scirpus validus Vahl of 82.56 μg/(m2·h). The integrated vertical constructed wetland is the resource of N2O emission, and integrated vertical constructed wetland planted with Scirpus validus Vahl shows weak absorption in the second half of December. KTN/N2O (the ratio of TN removal efficiency to N2O average flux) of Acorus calamus L, Canna indica L and Scirpus validus Vahl changes significantly with time compared to Cyperus alternifolius L, which shows the lower KTN/N2O. KTN/N2O is lower when Acorus calamus L and Canna indica L are in the first half of November, Scirpus validus Vahl in the first half of December, which means they release lower N2O than that in other time when they remove the same TN content. Acorus calamus L and Canna indica L are more favorable for the integrated vertical constructed wetland.

 

Key words: integrated vertical constructed wetland; wetland plant; N2O emission

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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