Investigation of Hydrodynamic Parameters in an Airlift Photobioreactor on CO2 Biofixation by Spirulina sp.

Zarei, Zahra and Malekshahi, Peyman and Trzcinski, Antoine P. ORCID: https://orcid.org/0000-0002-2880-708X and Morowvat, Mohammad Hossein (2022) Investigation of Hydrodynamic Parameters in an Airlift Photobioreactor on CO2 Biofixation by Spirulina sp. Sustainability, 14:7503. pp. 1-15.

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Abstract

The rise of CO2 concentration on Earth is a major environmental problem that causes global warming. To solve this issue, carbon capture and sequestration technologies are becoming more and more popular. Among them, cyanobacteria can efficiently sequestrate CO2, which is an eco-friendly and cost-effective way of reducing carbon dioxide, and algal biomass can be harvested as valuable products. In this study, the hydrodynamic parameters of an airlift photobioreactor such as gas holdup, mean bubble diameter and liquid circulation velocity were measured to investigate CO2 biofixation by Spirulina sp. The total gas holdup was found to increase linearly with the increase in the gas velocity from 0.185 to 1.936 cm/s. The mean bubble velocities in distilled water only and in the cyanobacterial culture on the first and sixth days of cultivation were 109.97, 87.98, and 65.89 cm/s, respectively. It was found that shear stress at gas velocities greater than 0.857 cm/s led to cyanobacterial death. After 7 days of batch culture, the maximum dry cell weight reached 1.62 g/L at the gas velocity of 0.524 cm/s, whereas the highest carbon dioxide removal efficiency by Spirulina sp. was 55.48% at a gas velocity of 0.185 cm/s, demonstrating that hydrodynamic parameters applied in this study were suitable to grow Spirulina sp. in the airlift photobioreactor and remove CO2.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current – Faculty of Health, Engineering and Sciences - School of Agriculture and Environmental Science (1 Jan 2022 -)
Faculty/School / Institute/Centre: Current – Faculty of Health, Engineering and Sciences - School of Agriculture and Environmental Science (1 Jan 2022 -)
Date Deposited: 21 Jun 2022 02:36
Last Modified: 21 Oct 2022 00:51
Uncontrolled Keywords: airlift photobioreactor; carbon sequestration; CO2 biofixation; gas holdup; liquid circulation velocity; Spirulina sp.
Fields of Research (2020): 40 ENGINEERING > 4011 Environmental engineering > 401102 Environmentally sustainable engineering
40 ENGINEERING > 4004 Chemical engineering > 400401 Carbon capture engineering (excl. sequestration)
41 ENVIRONMENTAL SCIENCES > 4101 Climate change impacts and adaptation > 410101 Carbon sequestration science
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering
28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280111 Expanding knowledge in the environmental sciences
Identification Number or DOI: https://doi.org/10.3390/ su14127503
URI: http://eprints.usq.edu.au/id/eprint/49228

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