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首页> 外文期刊>Environmental research >Fluidic oscillator-mediated microbubble generation to provide cost effective mass transfer and mixing efficiency to the wastewater treatment plants
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Fluidic oscillator-mediated microbubble generation to provide cost effective mass transfer and mixing efficiency to the wastewater treatment plants

机译：流体振荡器介导的微气泡产生，可为废水处理厂提供经济高效的传质和混合效率

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摘要

Aeration is one of the most energy intensive processes in the waste water treatment plants and any improvement in it is likely to enhance the overall efficiency of the overall process. In the current study, a fluidic oscillator has been used to produce microbubbles in the order of 100 μm in diameter by oscillating the inlet gas stream to a pair of membrane diffusers. Volumetric mass transfer coefficient was measured for steady state flow and oscillatory flow in the range of 40-100 l/min. The highest improvement of 55% was observed at the flow rates of 60, 90 and 100 l/min respectively. Standard oxygen transfer rate and efficiency were also calculated. Both standard oxygen transfer rate and efficiency were found to be considerably higher under oscillatory air flow conditions compared to steady state airflow. The bubble size distributions and bubble densities were measured using an acoustic bubble spectrometer and confirmed production of monodisperse bubbles with approximately 100 μm diameters with fluidic oscillation. The higher number density of microbubbles under oscillatory flow indicated the effect of the fluidic oscillation in microbubble production. Visual observations and dissolved oxygen measurements suggested that the bubble cloud generated by the fluidic oscillator was sufficient enough to provide good mixing and to maintain uniform aerobic conditions. Overall, improved mass transfer coefficients, mixing efficiency and energy efficiency of the novel microbubble generation method could offer significant savings to the water treatment plants as well as reduction in the carbon footprint.
机译：曝气是废水处理厂中能耗最高的过程之一，对其进行任何改进都可能会提高整个过程的整体效率。在当前的研究中，流体振荡器已用于通过将进气流振荡至一对膜扩散器来产生直径为100μm的微气泡。测量了稳态流量和振荡流量在40-100 l / min范围内的体积传质系数。分别在60、90和100 l / min的流速下观察到最高改善55％。还计算了标准氧气传输速率和效率。与稳态气流相比，在振荡气流条件下，标准氧气传输速率和效率都明显更高。使用声波光谱仪测量气泡尺寸分布和气泡密度，并确认通过流体振荡产生直径约为100μm的单分散气泡。在振荡流下较高数量的微泡表明在微泡生产中流体振荡的影响。视觉观察和溶解氧测量表明，由流体振荡器产生的气泡云足以提供良好的混合并维持均匀的有氧条件。总体而言，改进的传质系数，新型微气泡生成方法的混合效率和能源效率可为水处理厂节省大量资金，并减少碳足迹。

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  • 来源
    《Environmental research》 |2015年第2期|32-39|共8页
  • 作者

    Fahad Rehman; Gareth J.D. Medley; Hemaka Bandulasena; William B.J. Zimmerman;

  • 作者单位

    Department of Chemical & Biological Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK,Department of Chemical Engineering, COMSATS institute of Information Technology, 1.5 KM Ali Akbar Road (Defence Road), Off Raiwind Road, Lahore 54000, Pakistan;

    Department of Chemical & Biological Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK;

    Department of Chemical Engineering, Loughborough University, Leicestershire LE11 3TU, UK;

    Department of Chemical & Biological Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fluidic oscillator; Wastewater treatment; Microbubble generation; Mass transfer;

    机译：流体振荡器废水处理;微气泡的产生;传质;

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