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首页> 外文期刊>Environmental Science & Technology >Enhanced Long-Term Nitrogen Removal and Its Quantitative Molecular Mechanism in Tidal Flow Constructed Wetlands
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Enhanced Long-Term Nitrogen Removal and Its Quantitative Molecular Mechanism in Tidal Flow Constructed Wetlands

机译：潮汐人工湿地中增强的长期脱氮作用及其定量分子机理

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摘要

Tidal flow constructed wetlands (TF CWs) have recently been studied as a sustainable technology to achieve enhanced nitrogen removal; however, the underlying mechanisms responsible for removing ammonium (NH_4~+) and nitrate (NO_3~-) have not been compared and quantified at the molecular level (genes) in controlled TF CWs. In this study, two TF CWs T1 (treating NH_4~+ wastewater) and T2 (treating NO_3~- wastewater) achieved high removal efficiencies for chemical oxygen demand (COD, 92 ± 2.7% and 95 ± 2.4%, respectively), NH_4~+/NO_3~- (76 ± 3.9% and 97 ± 2.2%, respectively), and total nitrogen (TN, 81 ± 3.5% and 93 ± 2.3%, respectively). Combined analyses revealed that the presence of simultaneous nitrification, anammox, and deni- trification processes and the coupling of dissimilatory nitrate reduction to ammonium, ammonia oxidation, and anammox were the primary reason accounted for the robust treatment performance in T1 and T2, respectively. Results from stepwise regression analysis suggested that the NH_4~+ removal rate in T1 was collectively controlled by amoA, nxrA, and anammox, while the NO_3~- removal rate in T2 was governed by nxrA and narG gene.
机译：潮汐人工湿地（TF CWs）最近已被研究为一种可持续的技术，可以提高除氮能力。但是，尚未对在受控TF连续波分子中的分子水平（基因）上负责去除铵（NH_4〜+）和硝酸盐（NO_3〜-）的潜在机理进行比较和定量。在这项研究中，两个TF CW T1（处理NH_4〜+废水）和T2（处理NO_3〜-废水）实现了对化学需氧量的高去除率（COD，分别为92±2.7％和95±2.4％），NH_4〜。 + / NO_3〜-（分别为76±3.9％和97±2.2％）和总氮（TN，分别为81±3.5％和93±2.3％）。综合分析表明，同时进行的硝化，厌氧氨化和脱硝过程的存在，以及异化硝酸盐还原与铵，氨氧化和厌氧氨氮的耦合，分别是T1和T2的强劲处理性能的主要原因。逐步回归分析结果表明，T1中NH_4〜+的去除率由amoA，nxrA和厌氧氨水共同控制，而T2中NO_3〜-的去除率则由nxrA和narG基因控制。

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  • 来源
    《Environmental Science & Technology》 |2015年第7期|4575-4583|共9页
  • 作者

    Wei Zhi; Li Yuan; Guodong Ji; Chunguang He;

  • 作者单位

    Key Laboratory of Water and Sediment Sciences, Ministry of Education, Department of Environmental Engineering, Peking University, Beijing, 100871, China,John and Willie Leone Department of Energy and Mineral Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States;

    Key Laboratory of Water and Sediment Sciences, Ministry of Education, Department of Environmental Engineering, Peking University, Beijing, 100871, China;

    Key Laboratory of Water and Sediment Sciences, Ministry of Education, Department of Environmental Engineering, Peking University, Beijing, 100871, China;

    State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Northeast Normal University, Changchun, 130024, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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