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Using Microalgae to Convert Brewery Carbon Gas Emissions into Valuable Bioproducts

Alla Silkina Orcid Logo, Mohamed Emran Orcid Logo, Simon Turner, Kam Tang Orcid Logo

Energies, Volume: 17, Issue: 23, Start page: 6125

Swansea University Authors: Alla Silkina Orcid Logo, Mohamed Emran Orcid Logo, Kam Tang Orcid Logo

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DOI (Published version): 10.3390/en17236125

Abstract

The brewing industry is a major part of the agri-food sector, but its fermentation processes contribute significantly to global CO2 emissions, exacerbating the greenhouse gas crisis. Achieving net-zero emissions requires innovative solutions, and this study explored one such solution by using microa...

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Published in: Energies
ISSN: 1996-1073
Published: MDPI AG 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa68581
first_indexed 2025-01-09T20:33:53Z
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spelling 2024-12-17T14:05:21.1543114 v2 68581 2024-12-17 Using Microalgae to Convert Brewery Carbon Gas Emissions into Valuable Bioproducts 216d36449db09ed98c6971a2254a2457 0000-0002-1804-8083 Alla Silkina Alla Silkina true false b9887a0d45f861a0ad5ba1c76e4549a2 0000-0003-2702-7935 Mohamed Emran Mohamed Emran true false 69af43a3b9da24aef65c5d3a44956fe3 0000-0001-9427-9564 Kam Tang Kam Tang true false 2024-12-17 BGPS The brewing industry is a major part of the agri-food sector, but its fermentation processes contribute significantly to global CO2 emissions, exacerbating the greenhouse gas crisis. Achieving net-zero emissions requires innovative solutions, and this study explored one such solution by using microalgae to capture CO2 from a brewery while simultaneously generating valuable bioproducts. Two microalgae species, Tetradesmus obliquus and Limnospira maxima, were cultivated in a 1000 L raceway and a 400 L tubular photobioreactor, both powered by the brewery’s CO2 waste gas. The specific growth rates reached 0.3 in the raceway and 0.4–0.5 in the photobioreactor for both species. Notably, L. maxima showed higher productivity, achieving up to 0.80 g L−1 day−1 in the photobioreactor and 0.5 g L−1 day−1 in the raceway. Operating across 300 brewing days per year, a single module (1400 L) of this system could reduce a brewery’s CO2 emissions by 29%. These low-maintenance systems are modular, allowing for easy scaling and operation. The harvested biomass was nutritionally valuable; L. maxima contained up to 55% protein and 3% phycocyanin, while T. obliquus was rich in carbohydrates (36%) and lipids (12%), levels suitable for feeds and fertilizers. A cost-benefit analysis suggests that coupling CO2 removal with bioproduct generation supports a sustainable circular economy while offering financial returns. Journal Article Energies 17 23 6125 MDPI AG 1996-1073 Brewery; CO2 emissions; algal cultivation; greenhouse gas crisis; high-value products; circular bioeconomy 5 12 2024 2024-12-05 10.3390/en17236125 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Other This study was funded by the Welsh government’s SMART Expertise (grant no. 82481, awarded to Carole Llewellyn). 2024-12-17T14:05:21.1543114 2024-12-17T13:59:45.4170868 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Alla Silkina 0000-0002-1804-8083 1 Mohamed Emran 0000-0003-2702-7935 2 Simon Turner 3 Kam Tang 0000-0001-9427-9564 4
title Using Microalgae to Convert Brewery Carbon Gas Emissions into Valuable Bioproducts
spellingShingle Using Microalgae to Convert Brewery Carbon Gas Emissions into Valuable Bioproducts
Alla Silkina
Mohamed Emran
Kam Tang
title_short Using Microalgae to Convert Brewery Carbon Gas Emissions into Valuable Bioproducts
title_full Using Microalgae to Convert Brewery Carbon Gas Emissions into Valuable Bioproducts
title_fullStr Using Microalgae to Convert Brewery Carbon Gas Emissions into Valuable Bioproducts
title_full_unstemmed Using Microalgae to Convert Brewery Carbon Gas Emissions into Valuable Bioproducts
title_sort Using Microalgae to Convert Brewery Carbon Gas Emissions into Valuable Bioproducts
author_id_str_mv 216d36449db09ed98c6971a2254a2457
b9887a0d45f861a0ad5ba1c76e4549a2
69af43a3b9da24aef65c5d3a44956fe3
author_id_fullname_str_mv 216d36449db09ed98c6971a2254a2457_***_Alla Silkina
b9887a0d45f861a0ad5ba1c76e4549a2_***_Mohamed Emran
69af43a3b9da24aef65c5d3a44956fe3_***_Kam Tang
author Alla Silkina
Mohamed Emran
Kam Tang
author2 Alla Silkina
Mohamed Emran
Simon Turner
Kam Tang
format Journal article
container_title Energies
container_volume 17
container_issue 23
container_start_page 6125
publishDate 2024
institution Swansea University
issn 1996-1073
doi_str_mv 10.3390/en17236125
publisher MDPI AG
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
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description The brewing industry is a major part of the agri-food sector, but its fermentation processes contribute significantly to global CO2 emissions, exacerbating the greenhouse gas crisis. Achieving net-zero emissions requires innovative solutions, and this study explored one such solution by using microalgae to capture CO2 from a brewery while simultaneously generating valuable bioproducts. Two microalgae species, Tetradesmus obliquus and Limnospira maxima, were cultivated in a 1000 L raceway and a 400 L tubular photobioreactor, both powered by the brewery’s CO2 waste gas. The specific growth rates reached 0.3 in the raceway and 0.4–0.5 in the photobioreactor for both species. Notably, L. maxima showed higher productivity, achieving up to 0.80 g L−1 day−1 in the photobioreactor and 0.5 g L−1 day−1 in the raceway. Operating across 300 brewing days per year, a single module (1400 L) of this system could reduce a brewery’s CO2 emissions by 29%. These low-maintenance systems are modular, allowing for easy scaling and operation. The harvested biomass was nutritionally valuable; L. maxima contained up to 55% protein and 3% phycocyanin, while T. obliquus was rich in carbohydrates (36%) and lipids (12%), levels suitable for feeds and fertilizers. A cost-benefit analysis suggests that coupling CO2 removal with bioproduct generation supports a sustainable circular economy while offering financial returns.
published_date 2024-12-05T08:37:13Z
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