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首页> 外文期刊>Environmental Science & Technology >Field and Laboratory Studies Linking Hydrologic, Geochemical, and Microbiological Processes and Enhanced Denitrification during Infiltration for Managed Recharge
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Field and Laboratory Studies Linking Hydrologic, Geochemical, and Microbiological Processes and Enhanced Denitrification during Infiltration for Managed Recharge

机译：现场和实验室研究将水文，地球化学和微生物过程与渗透过程中增强的反硝化联系起来，以实现可管理补给

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摘要

We present linked field and laboratory studies investigating controls on enhanced nitrate processing during infiltration for managed aquifer recharge. We examine how carbon-rich permeable reactive barriers (PRBs) made of wood-chips or biochar, placed in the path of infiltrating water, stimulate microbial denitrification. In field studies with infiltration of 0.2-0.3 m/day and initial nitrate concentrations of [NO3-N] = 20-28 mg/L, we observed that woodchips promoted 37 +/- 6.6% nitrate removal (primarily via denitrification), and biochar promoted 33 +/- 12% nitrate removal (likely via denitrification and physical absorption effects). In contrast, unamended soil at the same site generated <5% denitrification. We find that the presence of a carbon-rich PRB has a modest effect on the underlying soil microbial community structure in these experiments, indicating that existing consortia have the capability to carry out denitrification given favorable conditions. In laboratory studies using intact cores from the same site, we extend the results to quantify how infiltration rate influences denitrification, with and without a carbon-rich PRB. We find that the influence of both PRB materials is diminished at higher infiltration rates (>0.7 m/day) but can still result in denitrification. These results demonstrate a quantitative relationship between infiltration rate and denitrification that depends on the presence and nature of a PRB. Combined results from these field and laboratory experiments, with complementary studies of denitrification during infiltration through other soils, suggest a framework for understanding linked hydrologic and chemical controls on microbial denitrification (and potentially other redox-sensitive processes) that could improve water quality during managed recharge.
机译：我们目前进行的现场和实验室研究相结合，研究了在受控的含水层补给过程中渗透过程中增强硝酸盐处理的控制措施。我们研究了由木屑或生物炭制成的富含碳的可渗透反应性屏障（PRB），该屏障位于渗透水的路径中如何刺激微生物的反硝化作用。在渗透率为0.2-0.3 m /天且硝酸盐初始浓度为[NO3-N] = 20-28 mg / L的田间研究中，我们观察到木片促进了37 +/- 6.6％的硝酸盐去除（主要是通过反硝化作用），以及生物炭促进了33 +/- 12％的硝酸盐去除（可能通过反硝化和物理吸收作用）。相反，同一地点的未改良土壤产生的反硝化作用小于5％。我们发现，在这些实验中，富含碳的PRB的存在对下层土壤微生物群落结构的影响不大，这表明现有的联合体在有利条件下具有进行反硝化的能力。在使用来自同一地点的完整岩心的实验室研究中，我们扩展了结果，以量化有无富碳PRB时渗透率如何影响反硝化作用。我们发现，在较高的渗透率（> 0.7 m / day）下，两种PRB材料的影响都会减小，但仍会导致反硝化作用。这些结果表明，渗透速率与反硝化之间的定量关系取决于PRB的存在和性质。这些现场和实验室实验的结果结合其他土壤渗透过程中反硝化的补充研究，提出了一个框架，用于理解微生物反硝化（以及可能的其他氧化还原敏感过程）相关的水文和化学控制方法，可以改善有管理的补给过程中的水质。 。

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  • 来源
    《Environmental Science & Technology》 |2019年第16期|9491-9501|共11页
  • 作者

    Gorski Galen; Fisher Andrew T.; Beganskas Sarah; Weir Walker B.; Redford Kaitlyn; Schmidt Calla; Saltikov Chad;

  • 作者单位

    Univ Calif Santa Cruz Dept Earth & Planetary Sci Santa Cruz CA 95064 USA;

    Univ Calif Santa Cruz Dept Earth & Planetary Sci Santa Cruz CA 95064 USA|Temple Univ Dept Earth & Environm Sci Philadelphia PA 19122 USA;

    Univ Calif Santa Cruz Dept Earth & Planetary Sci Santa Cruz CA 95064 USA|Desert Res Inst Reno NV 89514 USA;

    Univ Calif Santa Cruz Dept Microbiol & Environm Toxicol Santa Cruz CA 95064 USA|Univ Calif Irvine Dept Ecol & Evolutionary Biol Irvine CA 92697 USA;

    Univ San Francisco Dept Environm Sci San Francisco CA 94117 USA;

    Univ Calif Santa Cruz Dept Microbiol & Environm Toxicol Santa Cruz CA 95064 USA;

  • 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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