Simulation of a Novel Tubular Microalgae Photobioreactor with Aerated Tangent Inner Tubes: Improvements in Mixing Performance and Flashing-Light Effects.

IF 2.3 4区 生物学 Q3 MICROBIOLOGY
Archaea-An International Microbiological Journal Pub Date : 2020-07-10 eCollection Date: 2020-01-01 DOI:10.1155/2020/8815263
Xuyang Cui, Junhong Yang, Yuanzheng Feng, Wenwen Zhang
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引用次数: 14

Abstract

At present, large-scale and high-efficiency microalgal cultivation is the key to realizing the technology for carbon capture and storage (CCS) and bioresource recovery. Meanwhile, tubular photobioreactors (PBRs) have great potential for microalgal cultivation due to their high productivity. To improve the mixing performance and flashing-light effect, a novel tube PBR with the inner tube tangential to the outer tube was developed, whose radial aeration pores are situated along the length of the inner tube. The direction of aeration, aeration rate, light/dark cycle period (L/D), light-time ratio, average turbulent kinetic energy (TKE), and degree of synergy between the velocity and direction of the light field in the PBR were optimized by a computational fluid dynamics (CFD) simulation and field synergy theory. The results show that a downwards aeration direction of 30° and an aeration rate of 0.7 vvm are the most conducive to reducing the dead zone and improving the light/dark cycle frequency. Compared to the concentric double-tube PBR, the light/dark cycle frequency and light time of the tangent double-tube PBR increased by 78.2% and 36.2% to 1.8 Hz and 47.8%, respectively, and the TKE was enhanced by 48.1% from 54 to 80 cm2·s-2. Meanwhile, field synergy theory can be extended and applied to the design of tubular microalgae PBRs, and the average synergy of the light and velocity gradients across the cross-section increased by 38% to 0.69. The tangential inner tube aeration structure generated symmetrical vertical vortices between the light and dark areas in the PBR, which significantly improved the mixing performance and flashing-light effect. This novel design can provide a more suitable microenvironment for microalgal cultivation and is promising for bioresource recovery applications and improving the yield of microalgae.

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新型管内曝气切线微藻光生物反应器的模拟:混合性能和闪光效果的改进。
目前,大规模、高效的微藻培养是实现碳捕集与封存(CCS)和生物资源回收技术的关键。同时,管状光生物反应器(PBRs)因其高产率高而具有很大的微藻培养潜力。为了提高混合性能和闪光效果,研制了一种内管与外管切向的新型管状PBR,其径向曝气孔沿内管长度方向分布。利用计算流体力学(CFD)模拟和场协同理论对PBR内的曝气方向、曝气速率、光/暗周期(L/D)、光时比、平均湍流动能(TKE)以及光场速度与方向的协同度进行了优化。结果表明,下曝气方向为30°,曝气速率为0.7 vvm最有利于减少死区,提高明暗循环频率。与同心双管PBR相比,正切双管PBR的明暗周期频率和光照时间分别提高了78.2%和36.2%,达到1.8 Hz和47.8%,TKE从54到80 cm2·s-2提高了48.1%。同时,将场协同理论推广应用于管状微藻pbr设计中,光梯度和速度梯度的平均协同效应提高38%,达到0.69。切向内管曝气结构在PBR明暗区域之间形成对称垂直涡,显著提高了混合性能和闪光效果。该设计为微藻的培养提供了更适宜的微环境,在生物资源回收和提高微藻产量方面具有广阔的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.50
自引率
0.00%
发文量
1
审稿时长
>12 weeks
期刊介绍: Archaea is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles dealing with all aspects of archaea, including environmental adaptation, enzymology, genetics and genomics, metabolism, molecular biology, molecular ecology, phylogeny, and ultrastructure. Bioinformatics studies and biotechnological implications of archaea will be considered. Published since 2002, Archaea provides a unique venue for exchanging information about these extraordinary prokaryotes.
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