Research on the influence of aeration manners on the mass transfer characteristics of bubbles in multi-column airlift photobioreactor

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-04-01 DOI:10.1002/apj.3068

Shuangcheng Fu, Chenxi Liu, Faqi Zhou, Tao Yu, Kewei Li, Yue Zhang, Shenghu Yan, Xiang Zhang

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Abstract

Mass transfer of bubbles is important in microalgae cultivation. In this study, aiming to improve the microalgae culturing efficiency, computational fluid dynamics (CFD) was adopted to study the influence of the aeration manners on mass transfer of bubbles within ascending columns in multi-column airlift photobioreactor (PBR) and the hydrodynamic conditions within the PBR under different aeration manners. In addition, the bubble generation time, the detachment diameter, and the average volumetric mass transfer coefficient of bubbles in ascending columns were analyzed. Furthermore, the experimental results were compared with the simulation results obtained from microalgae cultivation. The results showed that the whole aeration manner yields the lowest mixing strength and mass transfer efficiency of bubbles at an aeration rate of 0.2 vvm. Conversely, both the mixing strength of the liquid and mass transfer coefficient of bubbles were enhanced under the half and alternate aeration manners. However, the results demonstrated that the distribution of the flow field was not uniform under the half aeration manner and there were obvious high-speed and low-speed zones. In contrast, the flow field distribution in the PBR was more uniform under the alternate aeration manner, which was suitable for microalgae cultivation at high concentration. This study effectively enhanced the mixing strength and CO₂ transfer rate in the PBR.

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曝气方式对多柱气升式光生物反应器中气泡传质特性的影响研究

气泡的传质在微藻培养中非常重要。本研究以提高微藻培养效率为目的，采用计算流体动力学（CFD）方法研究了多柱气升式光生物反应器（PBR）中曝气方式对上升柱内气泡传质的影响，以及不同曝气方式下PBR内的水动力条件。此外，还分析了上升柱中气泡的产生时间、脱离直径和平均体积传质系数。此外，还将实验结果与微藻培养的模拟结果进行了比较。结果表明，当曝气速率为 0.2 vvm 时，整体曝气方式产生的气泡混合强度和传质效率最低。相反，在半曝气和交替曝气方式下，液体的混合强度和气泡的传质系数都有所提高。但结果表明，在半曝气方式下，流场分布并不均匀，存在明显的高速区和低速区。相比之下，交替曝气方式下 PBR 的流场分布更加均匀，适合高浓度微藻培养。这项研究有效地提高了 PBR 的混合强度和二氧化碳转移率。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.