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首页> 外文期刊>Desalination and water treatment >Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate
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Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

机译：通过集成的垂直流人工湿地以高水力加载速率从尾水中去除硝酸盐

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摘要

Nitrate removal rates of two pilot-scale integrated vertical-flow constructed wetlands (IVCWs) treating tail water, under a hydraulic loading rate (HLR) of 250mm/d with a mean influent NO_3~--N concentration of 24.4 mg·L~(-1),were evaluated. Mean NO_3~--N removal efficiencies of 15.5 and 18.5% with mass removal rates of 1.01 g·m~(-2)·d~(-1)and 1.16g·m~(-2)·d~(-1) for IVCW 1 (planted with Canna indica and Pontederia cordata) and 2 (planted with Typha orientalis and Arundo donax var. versicolor), respectively, were achieved. The removal rate constants as fitted by the first-order area-based model averaged 0.046 and 0.055 m·d~(-2), respectively. Since NO_3~--N was the dominant nitrogen form in the effluent, denitrification was the limiting step in nitrogen removal despite of favorable pH and anaerobic conditions in the wetland beds. Low availability of carbon source, high HLR, and low temperature could be the probable influencing factors for the observed low NO_3~--N removal efficiencies. However, IVCW could be used to treat tail water for nitrate removal at a comparable high loading rate.
机译：在水力负荷率（HLR）为250mm / d的情况下，两个中试垂直尾流人工湿地（IVCWs）的硝酸盐去除率，进水NO_3〜--N的平均浓度为24.4 mg·L〜（ -1），进行评估。平均NO_3〜--N去除效率分别为15.5和18.5％，质量去除率分别为1.01 g·m〜（-2）·d〜（-1）和1.16g·m〜（-2）·d〜（-1 ），分别获得了IVCW 1（分别种植了印度大麻和堇菜）和2（分别种植了东方香蒲和Arundo donax var。versicolor）。一阶面积模型拟合的去除速率常数分别为0.046和0.055 m·d〜（-2）。由于NO_3-〜N是废水中的主要氮形式，尽管湿地床中的pH和厌氧条件良好，但反硝化是脱氮的限制步骤。碳源利用率低，HLR高和低温可能是观察到的NO_3〜--N去除效率低的可能影响因素。但是，IVCW可以用于处理尾水以相当的高负载率去除硝酸盐。

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  • 来源
    《Desalination and water treatment》 |2013年第33期|6031-6037|共7页
  • 作者

    Jun-jun Chang; Su-qing Wu; Yanran Dai; Zhen-bin Wu; Wei Liang;

  • 作者单位

    State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences. Wuhan 430072, China, Research Institute of Engineering and Technology, Yunnan University, Kunming 650091, China;

    State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences. Wuhan 430072, China, Jiangxi Academy of Environmental Sciences, Nanchang 330029, China;

    State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences. Wuhan 430072, China, Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences. Wuhan 430072, China;

    State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences. Wuhan 430072, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Integrated vertical-flow constructed wetlands (FVCWs); Tail water; NO_3~--Nremoval; Denitrification; High loading rate;

    机译：综合垂直流人工湿地（FVCW）;尾水;NO_3〜-不去除;反硝化;高装载率;

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