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首页> 外文期刊>Environmental Science & Technology >A Steady-State Biofilm Model for Simultaneous Reduction of Nitrate and Perchlorate, Part 2: Parameter Optimization and Results and Discussion
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A Steady-State Biofilm Model for Simultaneous Reduction of Nitrate and Perchlorate, Part 2: Parameter Optimization and Results and Discussion

机译：同时还原硝酸盐和高氯酸盐的稳态生物膜模型，第2部分：参数优化，结果和讨论

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摘要

Part 1 of this work developed a steady-state, multispecies biofilm model for simultaneous reduction of nitrate and perchlorate in the H_2-based membrane biofilm reactor (MBfR) and presented a novel method to solve it. In Part 2, the half-maximum-rate concentrations and inhibition coefficients of nitrate and perchlorate are optimized by fitting data from experiments with different combinations of influent nitrate and perchlorate concentrations. The model with optimized parameters is used to quantitatively and systematically explain how three important operating conditions (nitrate loading, perchlorate loading, and H_2 pressure) affect nitrate and perchlorate reduction and biomass distribution in these reducing biofilms. Perchlorate reduction and accumulation of perchlorate-reducing bacteria (PRB) in the biofilm are affected by four promotion or inhibition mechanisms: simultaneous use of nitrate and perchlorate by PRB and competition for H_2 the same resources in PRB, and space in a biofilm. For the hydrogen pressure evaluated experimentally, a low nitrate loading (<0.1 g N/m~2-d) slightly promotes perchlorate removal, because of the beneficial effect from PRB using both acceptors. However, a nitrate loading of >0.6 g N/m~2-d begins to inhibit perchlorate removal, as the competition effects become dominant.
机译：这项工作的第1部分建立了一个稳态的多物种生物膜模型，用于同时还原基于H_2的膜生物膜反应器（MBfR）中的硝酸盐和高氯酸盐，并提出了解决该问题的新方法。在第2部分中，通过拟合来自进水硝酸盐和高氯酸盐浓度的不同组合的实验数据，优化了硝酸盐和高氯酸盐的半最大速率浓度和抑制系数。具有优化参数的模型用于定量和系统地解释三个重要的操作条件（硝酸盐负载，高氯酸盐负载和H_2压力）如何影响这些还原生物膜中硝酸盐和高氯酸盐的还原以及生物量的分布。生物膜中高氯酸盐的减少和高氯酸盐减少细菌（PRB）的积累受四种促进或抑制机制的影响：PRB同时使用硝酸盐和高氯酸盐，以及在PRB中争夺H_2相同资源以及生物膜中的空间。对于通过实验评估的氢气压力，较低的硝酸盐负载量（<0.1 g N / m〜2-d）略微促进了高氯酸盐的去除，因为使用两个受体的PRB均具有有益的作用。然而，随着竞争作用变得占主导地位，> 0.6 g N / m〜2-d的硝酸盐负荷开始抑制高氯酸盐的去除。

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  • 来源
    《Environmental Science & Technology》 |2012年第3期|p.1608-1615|共8页
  • 作者

    Youneng Tang; Heping Zhao; Andrew K. Marcus; Rosa Krajmalnik-Brown; Bruce E. Rittmann;

  • 作者单位

    Swette Center for Environmental Biotechnology, Biodesign Institute at Arizona State University, 1001 South McAllister Ave., Tempe, Arizona 85287-5701, United States;

    Swette Center for Environmental Biotechnology, Biodesign Institute at Arizona State University, 1001 South McAllister Ave., Tempe, Arizona 85287-5701, United States;

    Swette Center for Environmental Biotechnology, Biodesign Institute at Arizona State University, 1001 South McAllister Ave., Tempe, Arizona 85287-5701, United States;

    Swette Center for Environmental Biotechnology, Biodesign Institute at Arizona State University, 1001 South McAllister Ave., Tempe, Arizona 85287-5701, United States;

    Swette Center for Environmental Biotechnology, Biodesign Institute at Arizona State University, 1001 South McAllister Ave., Tempe, Arizona 85287-5701, 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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