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Mixing characteristics and liquid circulation in a new multi-environment bioreactor

机译：新型多环境生物反应器的混合特性和液体循环

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摘要

The theoretical and experimental aspects of the hydrodynamics and mixing in a new multi-environment bioreactor that uses the air-lift design were investigated. This study focused on the mixing characteristics, residence time distribution, liquid circulation between three zones of aerobic, microaerophilic and anoxic, and liquid displacement in the bioreactor at influent flow rates of 720-1,450 L/day and air flow rates of 15-45 L/min. The theoretical analysis of liquid displacement led to the estimation of the specific rate of liquid discharge from the bioreactor at any given influent flow rate, and the number of liquid circulations between various bioreactor zones before the discharge of a given quantity of wastewater. The ratio of mean residence time to the overall hydraulic retention time (t_m/HRT) decreased with the increase of air flow rate at any given influent flow rate, and approached unity at higher air flow rates. Mixing was characterized in terms of the axial dispersion coefficient and Bodenstein number, demonstrating a linear relationship with the superficial gas velocity. A correlation was developed between the Bodenstein number and the Froude number. The study of liquid circulation between the zones showed that less than 1.5 % of the circulating liquid escapes circulation at each cycle and flows towards the outer clarifier, while the percentage of escaped liquid decreases with increasing air flow rate at a given influent flow rate. The specific rate of liquid discharge from the bioreactor increased from 0.19 to 0.69 h~' with the increase of air and influent flow rates from 15 to 45 L/min and 500 to 1,450 L/day, respectively. Under the examined operating conditions, mixed liquor circulates between 364 and 1,698 times between the aerobic, microaerophilic and anoxic zones before 99 % of its original volume is replaced by the influent wastewater.
机译：研究了使用气举设计的新型多环境生物反应器中流体动力学和混合的理论和实验方面。这项研究的重点是混合特性，停留时间分布，好氧，微需氧和缺氧三个区域之间的液体循环，以及进水流量为720-1,450 L / day和空气流量为15-45 L时生物反应器中的液体置换/分钟。液体排量的理论分析导致了在任何给定的进水流量下，从生物反应器中排出液体的比速率的估算，以及在排放给定量的废水之前各个生物反应器区域之间的液体循环数。在任何给定进水流量下，平均停留时间与总水力停留时间之比（t_m / HRT）随空气流量的增加而降低，而在较高的空气流量下，平均停留时间与整体水力停留时间的比值趋于统一。通过轴向弥散系数和Bodenstein数来表征混合，表明与表观气体速度呈线性关系。 Bodenstein数和Froude数之间建立了相关性。对区域之间的液体循环进行的研究表明，在每个循环中，只有不到1.5％的循环液体从循环中逸出并流向外部澄清池，而在给定的进水流量下，随着空气流量的增加，逸出液体的百分比降低。随着空气和进水流速分别从15 L / min至45 L / min和500 L / min至1,450 L / day的增加，从生物反应器排出液体的比速率从0.19增加到0.69 h〜。在检查的操作条件下，混合液在好氧，微需氧和缺氧区域之间循环364至1698次，然后将其原始体积的99％替换为进水。

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  • 来源
    《Bioprocess and Biosystems Engineering》 |2013年第10期|1339-1352|共14页
  • 作者

    Laleh Yerushalmi; Mahmood Alimahmoodi; Farnaz Behzadian; 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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  • 正文语种 eng
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  • 关键词

    Multi-environment bioreactor; Liquid circulation; Residence time distribution;

    机译：多环境生物反应器;液体循环;停留时间分配;

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