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A new method to measure and model dynamic oxygen microdistributions in moving biofilms

机译：测量和模拟运动生物膜中动态氧微分布的新方法

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摘要

Biofilms in natural environments offer a superior solution to mitigate water pollution. Artificially intensified biofilm reactors represented by rotating biological contactors (RBCs) are widely applied and studied. Understanding the oxygen transfer process in biofilms is an important aspect of these studies, and describing this process in moving biofilms (such as biofilms in RBCs) is a particular challenge. Oxygen transfer in RBCs behaves differently than in other biological reactors due to the special oxygen supply mode that results from alternate exposure of the biofilm to wastewater and air. The study of oxygen transfer in biofilms is indispensable for understanding biodegradation in RBCs. However, the mechanisms are still not well known due to a lack of effective tools to dynamically analyze oxygen diffusion, reaction, and microdistribution in biofilms. A new experimental device, the Oxygen Transfer Modeling Device (OTMD), was designed and manufactured for this purpose, and a mathematical model was developed to model oxygen transfer in biofilm produced by an RBC. This device allowed the simulation of the local environment around the biofilm during normal RBC operation, and oxygen concentrations varying with time and depth in biofilm were measured using an oxygen microelectrode. The experimental data conformed well to the model description, indicating that the OTMD and the model were stable and reliable. Moreover, the OTMD offered a flexible approach to study the impact of a single-factor on oxygen transfer in moving biofilms.
机译：自然环境中的生物膜为减轻水污染提供了卓越的解决方案。以旋转生物接触器（RBC）为代表的人工增强生物膜反应器得到了广泛的应用和研究。了解生物膜中的氧气转移过程是这些研究的重要方面，而在移动生物膜（例如RBC中的生物膜）中描述该过程是一个特殊的挑战。由于生物膜交替暴露于废水和空气中而产生的特殊氧气供应模式，RBC中的氧气转移行为与其他生物反应器不同。为了了解红细胞中的生物降解，研究生物膜中的氧转移是必不可少的。然而，由于缺乏有效地分析生物膜中氧扩散，反应和微分布的有效工具，该机制仍不为人所知。为此目的设计并制造了一种新的实验设备，氧气转移建模设备（OTMD），并开发了一个数学模型来对RBC生产的生物膜中的氧气转移进行建模。该设备允许在正常RBC操作期间模拟生物膜周围的局部环境，并使用氧气微电极测量生物膜中随时间和深度而变化的氧气浓度。实验数据与模型描述吻合良好，表明OTMD和模型稳定可靠。此外，OTMD提供了一种灵活的方法来研究单一因素对移动生物膜中氧气转移的影响。

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  • 来源
    《Environmental Pollution》 |2017年第10期|199-209|共11页
  • 作者

    Wang Jian-Hui; Chen You-Peng; Dong Yang; Wang Xi-Xi; Guo Jin-Song; Shen Yu; Yan Peng; Ma Teng-Fei; Sun Xiu-Qian; Fang Fang; Wang Jing;

  • 作者单位

    Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, MOE, Chongqing 400045, Peoples R China;

    Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, MOE, Chongqing 400045, Peoples R China|Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China;

    Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China;

    Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, MOE, Chongqing 400045, Peoples R China;

    Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China;

    Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China|Chongqing Technol & Business Univ, Natl Base Int Sci & Technol Cooperat Intelligent, Chongqing 400067, Peoples R China;

    Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China;

    Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, MOE, Chongqing 400045, Peoples R China;

    Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, MOE, Chongqing 400045, Peoples R China;

    Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, MOE, Chongqing 400045, Peoples R China;

    Chongqing Jianzhu Coll, Chongqing 400072, Peoples R China;

  • 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

    Wastewater treatment; Oxygen microdistribution; Microelectrode; Microsensor; Oxygen transfer modeling;

    机译：废水处理氧微分布微电极微传感器氧转移模型;

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