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Methane production from Sargassum muticum: effects of seasonality and of freshwater washes

Methane production from Sargassum muticum: effects of seasonality and of freshwater washes

Maneein, Supattra, Milledge, John J. ORCID: 0000-0003-0252-6711, Harvey, Patricia ORCID: 0000-0001-7193-4570 and Nielsen, Birthe ORCID: 0000-0002-0849-4987 (2020) Methane production from Sargassum muticum: effects of seasonality and of freshwater washes. Energy and Built Environment. ISSN 2666-1233 (In Press) (doi:https://doi.org/10.1016/j.enbenv.2020.06.011)

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Abstract

Biogas production from Sargassum muticum, an invasive seaweed species to Europe, is hampered by low methane (CH4) yields during anaerobic digestion (AD), but causes are unclear. This research is the first to demonstrate the impact of extensive freshwater washing of spring- and summer-harvested S. muticum on the CH4 production rates and the biochemical methane potential (BMP). The findings reveal that the rate profile of CH4 production is affected by extensively washing the seaweed and is dependent on seasonality. Spring-harvested S. muticum had higher initial CH4 production rates compared to summer-harvested S. muticum. For spring-harvested S. muticum, the initial rate of CH4 production was lowered by extensive washing. In contrast, extensively washed summer-harvested S. muticum had a higher degradation rate and CH4 production rate relative to its non-extensively washed counterpart. The highest CH4 potentials accumulated by the treated and non-treated S. muticum are, however, statistically similar and not influenced by seasonality or extensive washing (p > 0.05). Potential causes for differences in the rate of CH4 production between summer- and spring-harvested S. muticum are discussed. The differences in CH4 production from treated summer- and spring-harvested S. muticum acts as a stepping stone to understanding the causes for low CH4 yields, which could allow for further enhancements in CH4 production from S. muticum.

Item Type: Article
Additional Information: © 2020 Published by Elsevier B.V. on behalf of Southwest Jiaotong University. This is an open access article under the CC BY-NC-ND license. (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Uncontrolled Keywords: seaweed, biogas, biofuels, seasonality, washing
Subjects: Q Science > Q Science (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Algal Biotechnology Research Group
Faculty of Engineering & Science > School of Science (SCI)
Last Modified: 12 Aug 2020 20:41
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: None
URI: http://gala.gre.ac.uk/id/eprint/28794

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