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首页> 外文期刊>Environmental Science & Technology >A Bench-Scale Constructed Wetland As a Model to Characterize Benzene Biodegradation Processes in Freshwater Wetlands
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A Bench-Scale Constructed Wetland As a Model to Characterize Benzene Biodegradation Processes in Freshwater Wetlands

机译：基准规模的人工湿地作为表征淡水湿地苯生物降解过程的模型

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摘要

In wetlands, a variety of biotic and abiotic processes can contribute to the removal of organic substances. Here, we used compound-specific isotope analysis (CSIA), hydrogeochemical parameters and detection of functional genes to characterize in situ biodegradation of benzene in a model constructed wetland over a period of 370 days. Despite low dissolved oxygen concentrations (<30μM), the oxidation of ammonium to nitrate and the complete oxidation of ferrous iron pointed to a dominance of aerobic processes, suggesting efficient oxygen transfer into the sediment zone by plants. As benzene removal became highly efficient after day 231 (>98% removal), we applied CSIA to study in situ benzene degradation by indigenous microbes. Combining carbon and hydrogen isotope signatures by two-dimensional stable isotope analysis revealed that benzene was degraded aerobically, mainly via the monohydroxylation pathway. This was additionally supported by the detection of the BTEX monooxygenase gene tmoA in sediment and root samples. Calculating the extent of biodegradation from the isotope signatures demonstrated that at least 85% of benzene was degraded by this pathway and thus, only a small fraction was removed abiotically. This study shows that model wetlands can contribute to an understanding of biodegradation processes in floodplains or natural wetland systems.
机译：在湿地中，各种生物过程和非生物过程都可能有助于去除有机物质。在这里，我们使用化合物特异性同位素分析（CSIA），水文地球化学参数和功能基因检测来表征在模型建造的湿地中370天的时间内苯的原位生物降解。尽管溶解氧浓度较低（<30μM），但铵氧化为硝酸盐和二价铁完全氧化仍表明有氧过程占主导地位，这表明植物将氧有效地转移到沉积区。由于第231天后苯的去除效率很高（> 98％的去除率），我们将CSIA用于研究原生微生物对苯的原位降解。通过二维稳定同位素分析结合碳和氢同位素特征表明，苯主要通过单羟基化途径被需氧降解。检测沉积物和根样品中的BTEX单加氧酶基因tmoA进一步支持了这一点。从同位素特征计算生物降解程度表明，至少有85％的苯被该途径降解，因此，只有一小部分被非生物去除。这项研究表明，模型湿地可以有助于理解洪泛区或自然湿地系统中的生物降解过程。

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  • 来源
    《Environmental Science & Technology》 |2011年第23期|p.10036-10044|共9页
  • 作者

    Jana Rakoczy; Benjamin Remy; Carsten Vogt; Hans H. Richnow;

  • 作者单位

    Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research-UFZ, Leipzig, Germany;

    Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research-UFZ, Leipzig, Germany;

    Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research-UFZ, Leipzig, Germany;

    Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research-UFZ, Leipzig, Germany;

  • 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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