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首页> 外文期刊>Environmental Science & Technology >Model to Couple Anaerobic Process Kinetics with Biological Growth Equilibrium Thermodynamics
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Model to Couple Anaerobic Process Kinetics with Biological Growth Equilibrium Thermodynamics

机译：厌氧过程动力学与生物生长平衡热力学耦合的模型

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摘要

Monod kinetics indicates a substrate concentration limit (S^,,) at biological growth equilibrium where growth is just balanced by decay. A relationship between Smin and the Gibbs free energy available at growth equilibrium (AGE) was introduced into the Monod model and applied directly to chemostat cultures. Results from four anaerobic mixed-culture chemostat studies yielded AGe of —17.7 ± 2.2 kj/mol acetate converted to methane. AGE for propionate syntrophs in propionate-fed cultures was -8.0 ± 3.1 k|/mol propionate, compared with that of -3.0 ± 0.9 kj/mol H2 for the hydrogenotrophs present. With ethanol present, however, AGe f°r the hydrogenotrophs became more favorable, —6.1 ± 1.6 kj/mol H2, while AGE for propionate became positive even though propionate was consumed, suggesting an alternative interspecies electron transport route. The results suggest that Smim normally considered a function of an organism's intrinsic rate characteristics, is also a function of solution characteristics, and this is likely the case for the substrate affinity coefficient, K, as well. A comparison between AGE and Smin and reported threshold thermodynamic and concentration limits, leads to the conclusion that AGE and Smin represent lower and upper bounds, respectively, on such values. This study indicates that knowledge gained from pure-culture studies applies well to more complex natural anaerobic systems.
机译：Monod动力学表明在生物生长平衡时底物浓度极限（S ^ ,,），其中生长仅通过衰减来平衡。 Smin和在生长平衡（AGE）时可用的吉布斯自由能之间的关系被引入到Monod模型中，并直接应用于恒化器培养。四个厌氧混合培养恒化器研究的结果得出AGe为-17.7±2.2 kj / mol乙酸盐转化为甲烷。饲喂丙酸的培养物中丙酸滑膜的年龄为-8.0±3.1 ki / mol丙酸，而存在的氢营养体的AGE为-3.0±0.9 kj / mol H2。然而，在存在乙醇的情况下，AGe的氢营养盐变得更有利，为-6.1±1.6 kj / mol H2，而即使丙酸被消耗，丙酸的AGE仍为正值，表明存在另一种种间电子传输途径。结果表明，Smim通常被认为是生物体固有速率特征的函数，也是溶液特征的函数，底物亲和系数K也可能如此。比较AGE和Smin以及报告的热力学和浓度极限阈值，得出的结论是AGE和Smin分别代表该值的下限和上限。这项研究表明，从纯培养研究中获得的知识非常适用于更复杂的自然厌氧系统。

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  • 来源
    《Environmental Science & Technology》 |2011年第16期|p.6838-6844|共7页
  • 作者

    Perry L. McCarty; Jaeho Bae;

  • 作者单位

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States,Department of Environmental Engineering, Inha University, Namgu, Yonghyun dong 253, Incheon, Republic of Korea;

    Department of Environmental Engineering, Inha University, Namgu, Yonghyun dong 253, Incheon, Republic of Korea;

  • 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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