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Hydrodynamic characteristics and overall volumetric oxygen transfer coefficient of a new multi-environment bioreactor

机译：新型多环境生物反应器的流体动力学特性和总体积氧传递系数

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摘要

The hydrodynamic characteristics and the overall volumetric oxygen transfer coefficient of a new multi-environment bioreactor which is an integrated part of a wastewater treatment system, called BioCAST, were studied. This bioreactor contains several zones with different environmental conditions including aerobic, microaerophilic and anoxic, designed to increase the contaminant removal capacity of the treatment system. The multi-environment bioreactor is designed based on the concept of airlift reactors where liquid is circulated through the zones with different environmental conditions. The presence of openings between the aerobic zone and the adjacent oxygen-depleted microaerophilic zone changes the hydrodynamic properties of this bioreactor compared to the conventional airlift designs. The impact of operating and process parameters, notably the hydraulic retention time (HRT) and superficial gas velocity (U_G), on the hydrodynamics and mass transfer characteristics of the system was examined. The results showed that liquid circulation velocity (V_L), gas holdup (ε) and overall volumetric oxygen transfer coefficient (k_La_L) increase with the increase of superficial gas velocity (U_G), while the mean circulation time (t_c) decreases with the increase of superficial gas velocity. The mean circulation time between the aerobic zone (riser) and microaerophilic zone (downcomer) is a stronger function of the superficial gas velocity for the smaller openings (1/2 in.) between the two zones, while for the larger opening (1 in.) the mean circulation time is almost independent of U_G for U_G ≥ 0.023 m/s. The smaller openings between the two zones provide higher mass transfer coefficient and better zone generation which will contribute to improved performance of the system during treatment operations.
机译：研究了作为废水处理系统的组成部分的新型多环境生物反应器BioCAST的流体动力学特性和总体积氧传递系数。该生物反应器包含几个具有不同环境条件的区域，包括需氧，微需氧和缺氧，旨在提高处理系统的污染物去除能力。多环境生物反应器是根据空运反应器的概念设计的，其中液体通过具有不同环境条件的区域循环。与常规的气举设计相比，好氧区域与相邻的贫氧微需氧区域之间存在开口，从而改变了该生物反应器的流体力学特性。研究了操作和过程参数，特别是水力停留时间（HRT）和表观气体速度（U_G）对系统的流体动力学和传质特性的影响。结果表明，液体循环速度（V_L），气体滞留率（ε）和总体积氧传递系数（k_La_L）随着表观气体速度（U_G）的增加而增加，而平均循环时间（t_c）随表面气体速度的增加而减少。表观气体速度。有氧区（上升区）和微需氧区（下降区）之间的平均循环时间是两个区之间较小开口（1/2英寸）的表观气体速度的较强函数，而较大开口（1 in 。）当U_G≥0.023 m / s时，平均循环时间几乎与U_G无关。两个区域之间的较小开口可提供更高的传质系数和更好的区域生成能力，这将有助于改善治疗操作过程中系统的性能。

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  • 来源
    《Bioprocess and Biosystems Engineering》 |2013年第8期|1043-1052|共10页
  • 作者

    Farnaz Behzadian; Laleh Yerushalmi; Mahmood Alimahmoodi; Catherine N. Mulligan;

  • 作者单位

    Department of Building Civil and Environmental Engineering, Concordia University, 1455 de Maissonnuve Blvd. West, Montreal, QC H3G 1M8, Canada;

    Department of Building Civil and Environmental Engineering, Concordia University, 1455 de Maissonnuve Blvd. West, Montreal, QC H3G 1M8, Canada;

    Department of Building Civil and Environmental Engineering, Concordia University, 1455 de Maissonnuve Blvd. West, Montreal, QC H3G 1M8, Canada;

    Department of Building Civil and Environmental Engineering, Concordia University, 1455 de Maissonnuve Blvd. West, Montreal, QC H3G 1M8, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Multi-zone bioreactors; Airlift reactors; Hydrodynamic characteristics; Mass transfer;

    机译：多区域生物反应器;空运反应堆;水动力特性;传质;

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