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Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device

Introduction: Carbon sequestration by microalgae is an effective approach for achieving carbon neutrality owing to its high carbon capture efficiency and environmental friendliness. To improve microalgae CO(2) fixation efficiency, various methods to enhance CO(2) transfer at the gas-liquid interface...

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Autores principales: Zhao, Sha, Feng, Wenyue, Li, Jinming, Zhang, Xiaoguang, Liu, Li, Li, Hongyan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10336540/
https://www.ncbi.nlm.nih.gov/pubmed/37449087
http://dx.doi.org/10.3389/fbioe.2023.1225187
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author Zhao, Sha
Feng, Wenyue
Li, Jinming
Zhang, Xiaoguang
Liu, Li
Li, Hongyan
author_facet Zhao, Sha
Feng, Wenyue
Li, Jinming
Zhang, Xiaoguang
Liu, Li
Li, Hongyan
author_sort Zhao, Sha
collection PubMed
description Introduction: Carbon sequestration by microalgae is an effective approach for achieving carbon neutrality owing to its high carbon capture efficiency and environmental friendliness. To improve microalgae CO(2) fixation efficiency, various methods to enhance CO(2) transfer at the gas-liquid interface have resulted in high energy consumption. Methods: In this study, a novel aeration device with bubble cutting slices was installed in a photobioreactor for CO(2) supply, which could precisely separate bubbles into sizes on the way to rising after departure, achieving CO(2) transfer enhancement without extra energy consumption. Subsequently, the bubble cutting dynamic behaviors in the photobioreactor were studied, and the effects of thickness, hydrophilicity, and arrangement of cutting slices on microalgal growth were analyzed. Results: It was found that bubble cutting caused the maximum dry weight and biomass productivity of microalgae to improve by 6.99% and 33.33%, respectively, compared with those of the bioreactor without cutting units, owing to a 27.97% and 46.88% decrease in bubble size and rising velocity, respectively, and an 84.55% prolongation of bubble residence time. Discussion: Parallel cut slices with a thickness and spacing of less than 3 mm successfully cut the bubbles. The hydrophobic slice surface prevented daughter bubble departure and prolonged the bubble residence time, impeding microalgae growth owing to bubble coalescence with subsequent bubbles. The optimal cutting slice parameters and culture conditions for microalgal growth were 1 mm slice thickness, less than 1 mm slice spacing, 5% inlet CO(2) concentration, and 70 mL/min gas flow rate.
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spelling pubmed-103365402023-07-13 Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device Zhao, Sha Feng, Wenyue Li, Jinming Zhang, Xiaoguang Liu, Li Li, Hongyan Front Bioeng Biotechnol Bioengineering and Biotechnology Introduction: Carbon sequestration by microalgae is an effective approach for achieving carbon neutrality owing to its high carbon capture efficiency and environmental friendliness. To improve microalgae CO(2) fixation efficiency, various methods to enhance CO(2) transfer at the gas-liquid interface have resulted in high energy consumption. Methods: In this study, a novel aeration device with bubble cutting slices was installed in a photobioreactor for CO(2) supply, which could precisely separate bubbles into sizes on the way to rising after departure, achieving CO(2) transfer enhancement without extra energy consumption. Subsequently, the bubble cutting dynamic behaviors in the photobioreactor were studied, and the effects of thickness, hydrophilicity, and arrangement of cutting slices on microalgal growth were analyzed. Results: It was found that bubble cutting caused the maximum dry weight and biomass productivity of microalgae to improve by 6.99% and 33.33%, respectively, compared with those of the bioreactor without cutting units, owing to a 27.97% and 46.88% decrease in bubble size and rising velocity, respectively, and an 84.55% prolongation of bubble residence time. Discussion: Parallel cut slices with a thickness and spacing of less than 3 mm successfully cut the bubbles. The hydrophobic slice surface prevented daughter bubble departure and prolonged the bubble residence time, impeding microalgae growth owing to bubble coalescence with subsequent bubbles. The optimal cutting slice parameters and culture conditions for microalgal growth were 1 mm slice thickness, less than 1 mm slice spacing, 5% inlet CO(2) concentration, and 70 mL/min gas flow rate. Frontiers Media S.A. 2023-06-28 /pmc/articles/PMC10336540/ /pubmed/37449087 http://dx.doi.org/10.3389/fbioe.2023.1225187 Text en Copyright © 2023 Zhao, Feng, Li, Zhang, Liu and Li. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Bioengineering and Biotechnology
Zhao, Sha
Feng, Wenyue
Li, Jinming
Zhang, Xiaoguang
Liu, Li
Li, Hongyan
Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device
title Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device
title_full Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device
title_fullStr Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device
title_full_unstemmed Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device
title_short Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device
title_sort effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device
topic Bioengineering and Biotechnology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10336540/
https://www.ncbi.nlm.nih.gov/pubmed/37449087
http://dx.doi.org/10.3389/fbioe.2023.1225187
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