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首页> 外文期刊>Environmental Science & Technology >Mineral Transformation and Biomass Accumulation Associated With Uranium Bioremediation at Rifle, Colorado
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Mineral Transformation and Biomass Accumulation Associated With Uranium Bioremediation at Rifle, Colorado

机译：与步枪，科罗拉多州的铀生物修复有关的矿物转化和生物量积累

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摘要

Injection of organic carbon into the subsurface as an electron donor for bioremediation of redox-sensitive contaminants iike uranium often leads to mineral transformation and biomass accumulation, both of which can alter the flow field and potentially bioremediation efficacy. This work combines reactive transport modeling with a column experiment and field measurements to understand the biogeochemical processes and to quantify the biomass and mineral transformation/ accumulation during a bioremediation experiment at a uranium contaminated site near Rifle, Colorado. We use the reactive transport model CrunchFlow to explicitly simulate microbial community dynamics of iron and sulfate reducers, and their impacts on reaction rates. The column experiment shows clear evidence of mineral precipitation, primarily in the form of calcite and iron monosulfide. At the field scale, reactive transport simulations suggest that the biogeochemical reactions occur mostly close to the injection wells where acetate concentrations are highest, with mineral precipitate and biomass accumulation reaching as high as 1.5% of the pore space. This work shows that reactive transport modeling coupled with field data can be an effective tool for quantitative estimation of mineral transformation and biomass accumulation, thus improving the design of bioremediation strategies.
机译：将有机碳作为电子供体注入地下，以对氧化还原敏感的污染物（如铀）进行生物修复，这通常会导致矿物转化和生物质积累，这两者都会改变流场和潜在的生物修复功效。这项工作将反应运输模型与柱实验和现场测量相结合，以了解生物地球化学过程，并在科罗拉多州莱夫勒附近的铀污染场地进行生物修复实验期间量化生物量和矿物转化/积累。我们使用反应性运输模型CrunchFlow来明确模拟铁和硫酸盐还原剂的微生物群落动态及其对反应速率的影响。柱实验显示出明显的矿物沉淀证据，主要是方解石和单硫化铁形式。在田间规模上，反应性运输模拟表明，生物地球化学反应大多发生在乙酸盐浓度最高的注入井附近，矿物质沉淀和生物量积累高达孔隙空间的1.5％。这项工作表明，反应运输模型与现场数据相结合可以成为定量估算矿物转化和生物量积累的有效工具，从而改善生物修复策略的设计。

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  • 来源
    《Environmental Science & Technology》 |2009年第14期|5429-5435|共7页
  • 作者

    LI LI; CARL I. STEEFEL; KENNETH H . WILLIAMS; MICHAEL J. WILKINS; SUSAN S. HUBBARD;

  • 作者单位

    Earth Sciences Division, Lawrence Berkeley National laboratory, 1 Cyclotron Road, MS 90-1116, Berkeley, California 94720;

    Earth Sciences Division, Lawrence Berkeley National laboratory, 1 Cyclotron Road, MS 90-1116, Berkeley, California 94720;

    Earth Sciences Division, Lawrence Berkeley National laboratory, 1 Cyclotron Road, MS 90-1116, Berkeley, California 94720;

    Department of Earth and Planetary Science, University of California, Berkeley, California 94720;

    Earth Sciences Division, Lawrence Berkeley National laboratory, 1 Cyclotron Road, MS 90-1116, Berkeley, California 94720;

  • 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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