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The establishment of a marine focused biorefinery for bioethanol production using seawater and a novel marine yeast strain

Zaky, Abdelrahman Saleh; Greetham, Darren; Tucker, Gregory A.; Du, Chenyu

The establishment of a marine focused biorefinery for bioethanol production using seawater and a novel marine yeast strain Thumbnail


Authors

Abdelrahman Saleh Zaky

Darren Greetham

Gregory A. Tucker

Chenyu Du



Abstract

Current technologies for bioethanol production rely on the use of freshwater for preparing the fermentation media and use yeasts of a terrestrial origin. Life cycle assessment has suggested that between 1,388 to 9,812 litres of freshwater are consumed for every litre of bioethanol produced. Hence, bioethanol is considered a product with a high-water footprint. This paper investigated the use of seawater-based media and a novel marine yeast strain ‘Saccharomyces cerevisiae AZ65’ to reduce the water footprint of bioethanol. Results revealed that S. cerevisiae AZ65 had a significantly higher osmotic tolerance when compared with the terrestrial reference strain. Using 15-L bioreactors, S. cerevisiae AZ65 produced 93.50 g/L ethanol with a yield of 83.33% (of the theoretical yield) and a maximum productivity of 2.49 g/L/h when using seawater-YPD media. This approach was successfully applied using an industrial fermentation substrate (sugarcane molasses). S. cerevisiae AZ65 produced 52.23 g/L ethanol using molasses media prepared in seawater with a yield of 73.80% (of the theoretical yield) and a maximum productivity of 1.43 g/L/h. These results demonstrated that seawater can substitute freshwater for bioethanol production without compromising production efficiency. Results also revealed that marine yeast is a potential candidate for use in the bioethanol industry especially when using seawater or high salt based fermentation media.

Citation

Zaky, A. S., Greetham, D., Tucker, G. A., & Du, C. (2018). The establishment of a marine focused biorefinery for bioethanol production using seawater and a novel marine yeast strain. Scientific Reports, 8(1), https://doi.org/10.1038/s41598-018-30660-x

Journal Article Type Article
Acceptance Date Jul 26, 2018
Online Publication Date Aug 14, 2018
Publication Date 2018-12
Deposit Date Nov 6, 2018
Publicly Available Date Nov 6, 2018
Journal Scientific Reports
Print ISSN 2045-2322
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 8
Issue 1
Article Number 12127
DOI https://doi.org/10.1038/s41598-018-30660-x
Public URL https://nottingham-repository.worktribe.com/output/1230341
Publisher URL https://www.nature.com/articles/s41598-018-30660-x

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