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首页> 外文期刊>Journal of Contaminant Hydrology >A quantitative framework for understanding complex interactions between competing interfacial processes and in situ biodegradation
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A quantitative framework for understanding complex interactions between competing interfacial processes and in situ biodegradation

机译：用于理解竞争性界面过程与原位生物降解之间复杂相互作用的定量框架

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摘要

In situ bioremediation of contaminated groundwater is made technologically challenging by the physically, chemically, and biologically heterogeneous subsurface environment. Subsurface heterogeneities are important because of influences on interfacial mass transfer processes that impact the availability of substrates to microorganisms. The goal of this study was to perform a "proof-of-concept" evaluation of the utility of a quantitative framework based on a set of dimensionless coefficients for evaluating the effects of competing physicochemical interfacial and biokinetic processes at the field scale. First, three numerical modeling experiments were completed, demonstrating how the framework can be used to identify the rate-limiting process for the overall bioremediation rate, and to predict what engineered enhancements will alleviate the rate-limiting process. Baseline conditions for each scenario were established to examine intrinsic biodegradation with a given rate-limiting process (either dispersion, biokinetics, or sorption). Then different engineering treatments were examined. In each case, the treatment predicted to be appropriate for addressing the overall rate-limiting process based on the quantitative framework alleviated the limitation more successfully, and enhanced the in situ biodegradation rate more than the alternative enhancements. Second, the quantitative framework was applied to a series of large-scale laboratory and field-scale experiments, using reported parameter estimates to calculate the relevant dimensionless coefficients and predict the rate-limiting process(es). Observations from the studies were then used to evaluate those predictions.
机译：物理，化学和生物异质地下环境对污染的地下水进行原位生物修复在技术上具有挑战性。由于对界面传质过程的影响会影响底物对微生物的可用性，因此地下异质性非常重要。这项研究的目的是基于一组无量纲系数对定量框架的效用进行“概念验证”评估，以评估田间规模的竞争性理化界面和生物动力学过程的影响。首先，完成了三个数值模拟实验，展示了如何使用该框架识别整个生物修复速率的限速过程，并预测哪些工程改造将减轻限速过程。建立每种情况的基准条件，以检查给定限速过程（分散，生物动力学或吸附）的固有生物降解。然后检查了不同的工程处理方法。在每种情况下，根据定量框架预测适合于解决总体限速过程的治疗方法均能更成功地缓解限制，并且比其他增强方法更能提高原位生物降解率。其次，将定量框架应用于一系列大型实验室和现场规模的实验，使用报告的参数估计值来计算相关的无量纲系数并预测限速过程。然后将研究的观察结果用于评估这些预测。

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  • 来源
    《Journal of Contaminant Hydrology》 |2013年第3期|16-36|共21页
  • 作者

    Mark A. Johnson; Xin Song; Eric A. Seagren;

  • 作者单位

    Present address: Geosyntec Consultants, 10220 Old Columbia Rd. #A,Columbia, MD 21046, United States.;

    Present address: ARCADIS U.S., Inc., 100 Montgomery St., Suite 300, San Francisco, CA 94104, United States;

    Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, Ml 49931, 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    in situ; bioremediation; heterogeneous; dispersion; biokinetics; sorption;

    机译：原位生物修复;异质;分散;生物动力学吸附;

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