Influence of paddlewheel geometry on hydrodynamic performance and energy consumption in microalgae cultivations in open raceway ponds.

IF 3.5 3区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Bioprocess and Biosystems Engineering Pub Date : 2025-04-23 DOI:10.1007/s00449-025-03168-8

Gabriel de Morais Campos, Natalia Dos Santos Renato, Victor Hugo Laviola de Oliveira, Pedro Henrique de Moura Rodrigues, Marcio Arêdes Martins

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Abstract

Microalgae cultivation is a field with significant potential across various industries, such as pharmaceuticals, food, cosmetics, and energy. Aiming to optimize the geometric parameters of a paddlewheel agitation system through computational fluid dynamics (CFD) and experimental validation, an investigation was conducted involving different rotation speeds, blade pitch angles, and the number of blades on a paddlewheel within a microalgae cultivation tank. The results revealed paddlewheels with 90° inclined blades exhibited higher average flow velocities. Regarding the vertical mixing index, the 8-blade paddlewheels demonstrated inferior performance compared to systems with four and six blades. A pitch angle of 60° minimized power consumption. The optimal configuration found was a 60°-angled 4-blade paddlewheel, operating at a rotation speed of 19 rpm, yielding the highest mixing performance index value at 46.12 W^-1. The straight blades operated at 13 rpm could not sustain microalgae suspension. For 60° inclined blades, all tested rotations achieved a high level of suspension.

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桨轮几何形状对开放式滚道池微藻养殖水动力性能和能量消耗的影响

微藻的培养是一个在制药、食品、化妆品和能源等各个行业都具有巨大潜力的领域。为了通过计算流体动力学（CFD）和实验验证优化桨轮搅拌系统的几何参数，在微藻培养池内进行了不同转速、桨轮桨距角和桨轮桨叶数的桨轮搅拌系统研究。结果表明，90°倾斜叶片的桨轮具有较高的平均流速。在垂直混合指数方面，8叶片桨轮的性能低于4叶片和6叶片桨轮。60°的俯仰角最大限度地减少了功耗。最佳配置为60°角4叶桨轮，转速为19 rpm，混合性能指标值为46.12 W-1时最高。13转/分的直叶片不能维持微藻悬浮。对于60°倾斜叶片，所有测试的旋转都达到了高水平的悬浮。

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来源期刊

Bioprocess and Biosystems Engineering 工程技术-工程：化工

CiteScore

7.90

自引率

2.60%

发文量

147

审稿时长

2.6 months

期刊介绍： Bioprocess and Biosystems Engineering provides an international peer-reviewed forum to facilitate the discussion between engineering and biological science to find efficient solutions in the development and improvement of bioprocesses. The aim of the journal is to focus more attention on the multidisciplinary approaches for integrative bioprocess design. Of special interest are the rational manipulation of biosystems through metabolic engineering techniques to provide new biocatalysts as well as the model based design of bioprocesses (up-stream processing, bioreactor operation and downstream processing) that will lead to new and sustainable production processes. Contributions are targeted at new approaches for rational and evolutive design of cellular systems by taking into account the environment and constraints of technical production processes, integration of recombinant technology and process design, as well as new hybrid intersections such as bioinformatics and process systems engineering. Manuscripts concerning the design, simulation, experimental validation, control, and economic as well as ecological evaluation of novel processes using biosystems or parts thereof (e.g., enzymes, microorganisms, mammalian cells, plant cells, or tissue), their related products, or technical devices are also encouraged. The Editors will consider papers for publication based on novelty, their impact on biotechnological production and their contribution to the advancement of bioprocess and biosystems engineering science. Submission of papers dealing with routine aspects of bioprocess engineering (e.g., routine application of established methodologies, and description of established equipment) are discouraged.