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首页> 外文期刊>Environmental Science & Technology >Engineered and Environmental Controls of Microbial Denitrifkation in Established Bioretention Cells
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Engineered and Environmental Controls of Microbial Denitrifkation in Established Bioretention Cells

机译：建立的生物保留池中微生物脱氮的工程设计和环境控制

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摘要

Bioretention cells (BRCs) are effective tools for treating urban stormwater, but nitrogen removal by these systems is highly variable. Improvements in nitrogen removal are hampered by a lack of data directly quantifying the abundance or activity of denitrifying microorganisms in BRCs and how they are controlled by original BRC design characteristics. We analyzed denitrifiers in twenty-three BRCs of different designs across three mid-Atlantic states (MD, VA, and NC) by quantifying two bacterial denitrification genes (nirK and nosZ ) and potential enzymatic denitrification rates within the soil medium. Overall, we found that BRC design factors, rather than local environmental variables, had the greatest effects on variation in denitrifier abundance and activity. Specifically, denitrifying populations and denitrification potential increased with organic carbon and inorganic nitrogen concentrations in the soil media and decreased in BRCs planted with grass compared to other types of vegetation. Furthermore, the top layers of BRCs consistently contained greater concentrations and activity of denitrifying bacteria than bottom layers, despite longer periods of saturation and the presence of permanently saturated zones designed to promote denitrification at lower depths. These findings suggest that there is still considerable potential for design improvements when constructing BRCs that could increase denitrification and mitigate nitrogen export to receiving waters.
机译：生物滞留池（BRC）是处理城市雨水的有效工具，但是这些系统对氮的去除具有很大的可变性。由于缺乏直接量化BRC中反硝化微生物的丰度或活性以及如何通过原始BRC设计特征控制其脱氮微生物的数据，阻碍了脱氮的改进。我们通过量化两个细菌反硝化基因（ nirK和 nosZ）以及土壤中潜在的酶促反硝化率，分析了横跨大西洋中部三个州（MD，VA和NC）的23种不同设计的BRC中的反硝化剂介质。总体而言，我们发现BRC设计因素而不是局部环境变量对反硝化器丰度和活性的变化影响最大。具体而言，与其他类型的植被相比，土壤介质中的反硝化种群和反硝化潜力随有机碳和无机氮浓度的增加而增加，而草种植的BRC中反硝化的种群和反硝化的潜力则下降。此外，尽管饱和期更长，并且存在旨在促进较低深度反硝化的永久性饱和区，但BRC的顶层始终比底层具有更高的反硝化细菌浓度和活性。这些发现表明，在建造BRC时，仍有很大的设计改进潜力，可以增加反硝化作用并减轻氮向接收水的出口。

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  • 来源
    《Environmental Science & Technology》 |2018年第9期|5358-5366|共9页
  • 作者

    LucasJ. Waller; Gregory K. Evanylo; Leigh-Anne H. Krometis; Michael S. Strickland; Theresa Wynn-Thompson; Brian D. Badgley;

  • 作者单位

    School of Plant and Environmental Sciences, Department of Biological Systems Engineering, Global Change Center, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, United States;

    School of Plant and Environmental Sciences, Department of Biological Systems Engineering, Global Change Center, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, United States;

    School of Plant and Environmental Sciences, Department of Biological Systems Engineering, Global Change Center, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, United States;

    Department of Soil and Water Systems, University of Idaho, Moscow, Idaho 83844, United States;

    School of Plant and Environmental Sciences, Department of Biological Systems Engineering, Global Change Center, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, United States;

    School of Plant and Environmental Sciences, Department of Biological Systems Engineering, Global Change Center, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, United States;

  • 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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