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首页> 外文期刊>Environmental Science & Technology >Microscale Hydrodynamic Analysis of Aerobic Granules in the Mass Transfer Process
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Microscale Hydrodynamic Analysis of Aerobic Granules in the Mass Transfer Process

机译：传质过程中好氧颗粒的微观水动力分析

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摘要

The internal structure of aerobic granules has a significant impact on the hydrodynamic performance and mass transfer process, and severely affects the efficiency and stability of granules-based reactors for wastewater treatment In this study, for the first time the granule complex structure was correlated with the hydrodynamic performance and substrates reactions process. First a series of multiple fluorescence stained confocal laser scanning microscopy images of aerobic granules were obtained. Then, the form and structure of the entire granule was reconstructed. A three-dimensional computational fluid dynamics study was carried out for the hydrodynamic analysis. Two different models were developed on the basis of different fluorescence stained confocal laser scanning microscopy images to elucidate the roles of the granule structure in the hydrodynamic and mass transfer processes of aerobic granules. The fluid flow behavior, such as the velocity profiles, the pathlines and hence the hydrodynamic drag force, exerted on the granule in a Newtonian fluid, was studied by varying the Reynolds number. Furthermore, the spatial distribution of dissolved nutrients (e.g., oxygen) was acquired by solving the convection-diffusion equations on the basis of the reconstructed granule structure. This study demonstrates that the reconstructed granule model could offer a better understanding to the mass transfer process of aerobic granules than simply considering the granule structure to be homogeneous.
机译：好氧颗粒的内部结构对水动力性能和传质过程有重大影响，并且严重影响颗粒型反应器在废水处理中的效率和稳定性。流体力学性能和底物反应过程。首先获得了好氧颗粒的一系列多重荧光染色的共聚焦激光扫描显微镜图像。然后，重建整个颗粒的形式和结构。对流体动力学分析进行了三维计算流体动力学研究。在不同的荧光染色共聚焦激光扫描显微镜图像的基础上开发了两种不同的模型，以阐明颗粒结构在需氧颗粒的流体动力学和传质过程中的作用。通过改变雷诺数，研究了施加在牛顿流体中颗粒上的流体流动行为，例如速度分布，路径线以及因此施加的流体动力阻力。此外，在重建的颗粒结构的基础上，通过求解对流扩散方程，获得了溶解的营养物（例如，氧气）的空间分布。这项研究表明，与简单地认为颗粒结构是均匀的相比，重建的颗粒模型可以更好地了解需氧颗粒的传质过程。

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  • 来源
    《Environmental Science & Technology》 |2010年第19期|p.7555-7560|共6页
  • 作者

    LI LIU; WEN -WEI LI; GUO-PING SHENG; ZHI-FENC LIU; RAYMOND J. ZENG; JUN-XIN LIU; HAN-QING YU; DUU-IONG LEE;

  • 作者单位

    Department of Chemistry, Department of Thermal Science and Energy Engineering, University of Science & Technology of China, Hefei, 230026, China;

    rnDepartment of Chemistry, Department of Thermal Science and Energy Engineering, University of Science & Technology of China, Hefei, 230026, China;

    rnDepartment of Chemistry, Department of Thermal Science and Energy Engineering, University of Science & Technology of China, Hefei, 230026, China;

    rnDepartment of Chemistry, Department of Thermal Science and Energy Engineering, University of Science & Technology of China, Hefei, 230026, China;

    rnDepartment of Chemistry, Department of Thermal Science and Energy Engineering, University of Science & Technology of China, Hefei, 230026, China;

    rnChinese Academy of Sciences,Beijing, 100085, and China;

    rnDepartment of Chemistry, Department of Thermal Science and Energy Engineering, University of Science & Technology of China, Hefei, 230026, China;

    rnDepartment of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, 106, Taiwan;

  • 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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