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Diauxic lag of denitrifying bacteria in oxic/anoxic cycling under continuous flow conditions.

机译：在连续流动条件下，含氧/缺氧循环中反硝化细菌的双氮滞后。

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摘要

The present study was conducted to investigate diauxic lag of denitrifying bacteria under an ultimate state of oxic/anoxic cycling under continuous flow conditions. As preliminary steps, the industry standard Activated Sludge Model No. 1 was extended with denitrification models and a simulation study was conducted to compare predictions of the conventional and an extended version.; An experimental system was developed to implement bacterial pure culture growth under continuous flow conditions. The performance of the system was verified by determining the reproducibility of experimental results. Using the experimental system, diauxic lag of denitrifying bacteria was then studied under oxic/anoxic cycling conditions.; The experimental system developed in the present study was capable of achieving pure culture of denitrifying bacteria without contamination up to the desirable length of time for experiments. The reproducibility of the length of diauxic lag and the highest anoxic observed specific growth rates were significantly improved by achieving steady state growth of bacteria as a preliminary stage.; Diauxic lag of Pseudomonas denitrificans under continuous flow conditions could be characterized by the virtual batch curve method developed in the present study. The eASM1m was able to predict the observed diauxic lag under the continuous flow conditions with slight modification of parameters. The experimental results were significantly influenced by the magnitude of biomass accumulation at the feed inlet. Growth patterns in preceding oxic phase were likely to have an effect on length of diauxic lag during consecutive anoxic phase, which could not be predicted by eASM1m.; Predictions of eASM1m on growth of Pseudomonas denitrificans in alternating oxic/anoxic cycling under continuous flow conditions were consistent with results from a previous study. It has been found that Pseudomonas denitrificans could not establish significant anoxic growth during alternating oxic/anoxic cycling under continuous flow conditions, with up to 24 hour cycle length. The eASM1m could not fit the growth behaviors with the previous parameters. Furthermore, the diauxic lag after the cycling was significantly longer than the initial lag, which was additional evidence explaining that growth patterns of bacteria in the preceding oxic phases may influence diauxic lag of bacteria in the following anoxic phases.
机译：进行本研究是为了研究在连续流动条件下，在有氧/无氧循环的最终状态下反硝化细菌的双生滞后。作为初步步骤，将工业标准1号活性污泥模型与反硝化模型进行了扩展，并进行了模拟研究，以比较传统版本和扩展版本的预测。开发了一种实验系统以在连续流动条件下实现细菌纯培养物的生长。通过确定实验结果的可重复性来验证系统的性能。使用该实验系统，然后在有氧/缺氧循环条件下研究了反硝化细菌的双生滞后。在本研究中开发的实验系统能够实现反硝化细菌的纯培养，而不会污染所需的实验时间。通过在初始阶段实现细菌的稳态生长，显着提高了双生滞后时间的重现性和最高的缺氧比生长率。本研究开发的虚拟批曲线方法可以表征连续流动条件下反硝化假单胞菌的双生滞后。 eASM1m能够预测连续流量条件下的观测到的双相滞后，而只需稍加修改参数即可。实验结果受到进料口生物量积累量的显着影响。前一个含氧阶段的生长方式可能会影响连续缺氧阶段的双性滞后时间，这是eASM1m无法预测的。 eASM1m对连续流动条件下交替的有氧/无氧循环中反硝化假单胞菌生长的预测与先前的研究结果一致。已经发现，在连续流动条件下，长达24小时的循环时间，在交替的有氧/无氧循环期间，反硝化假单胞菌不能建立明显的缺氧生长。 eASM1m无法使用先前的参数来拟合生长行为。此外，循环后的双生滞后明显长于初始滞后，这是另外的证据解释了先前有氧相中细菌的生长方式可能会影响后续缺氧相中细菌的双生滞后。

著录项

  • 作者

    Lee, Dong-Uk.;

  • 作者单位

    University of Florida.;

  • 授予单位 University of Florida.;
  • 学科 Biology Microbiology.; Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 208 p.
  • 总页数 208
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 微生物学;环境污染及其防治;
  • 关键词

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