An attributional life cycle assessment of microbial protein production : A case study on using hydrogen-oxidizing bacteria

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http://hdl.handle.net/10138/328295

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Järviö , N , Maljanen , N-L , Kobayashi , Y , Ryynänen , T & Tuomisto , H 2021 , ' An attributional life cycle assessment of microbial protein production : A case study on using hydrogen-oxidizing bacteria ' , The Science of the Total Environment , vol. 776 , 145764 . https://doi.org/10.1016/j.scitotenv.2021.145764

Title: An attributional life cycle assessment of microbial protein production : A case study on using hydrogen-oxidizing bacteria
Author: Järviö, Natasha; Maljanen, Netta-Leena; Kobayashi, Yumi; Ryynänen, Toni; Tuomisto, Hanna
Contributor: University of Helsinki, Future Sustainable Food Systems
University of Helsinki, Doctoral Programme in Sustainable Use of Renewable Natural Resources
University of Helsinki, Helsinki Institute of Sustainability Science (HELSUS)
University of Helsinki, Ruralia Institute, Mikkeli
University of Helsinki, Helsinki Institute of Sustainability Science (HELSUS)
Date: 2021-07-01
Language: eng
Number of pages: 12
Belongs to series: The Science of the Total Environment
ISSN: 0048-9697
URI: http://hdl.handle.net/10138/328295
Abstract: Novel food production technologies are being developed to address the challenges of securing sustainable and healthy nutrition for the growing global population. This study assessed the environmental impacts of microbial protein (MP) produced by autotrophic hydrogen-oxidizing bacteria (HOB). Data was collected from a company currently producing MP using HOB (hereafter simply referred to as MP) on a small-scale. Earlier studies have performed an environmental assessment of MP on a theoretical basis but no study yet has used empirical data. An attributional life cycle assessment (LCA) with a cradle-to-gate approach was used to quantify global warming potential (GWP), land use, freshwater and marine eutrophication potential, water scarcity, human (non-)carcinogenic toxicity, and the cumulative energy demand (CED) of MP production in Finland. A Monte Carlo analysis was performed to assess uncertainties. The impacts of alternative production options and locations were explored. The impacts were compared with animal- and plant-based protein sources for human consumption as well as protein sources for feed. The results showed that electricity consumption had the highest contribution to environmental impacts. Therefore, the source of energy had a substantial impact on the results. MP production using hydropower as an energy source yielded 87.5% lower GWP compared to using the average Finnish electricity mix. In comparison with animal-based protein sources for food production, MP had 53-100% lower environmental impacts depending on the reference product and the source of energy assumed for MP production. When compared with plant-based protein sources for food production, MP had lower land and water use requirements, and eutrophication potential but GWP was reduced only if low-emission energy sources were used. Compared to protein sources for feed production, MP production often resulted in lower environmental impact for GWP (FHE), land use, and eutrophication and acidification potential, but generally caused high water scarcity and required more energy.
Subject: 415 Other agricultural sciences
MICROBIAL PROTEIN
life cycle assessment (LCA)
cellular agriculture
food
hydrogen-oxidizing bacteria
Microbial protein
Cellular agriculture
LCA
Food
Hydrogen-oxidizing bacteria
ENVIRONMENTAL IMPACTS
FOOD
WATER
ENERGY
FEED
CAPTURE
QUALITY
BIOMASS
LAND
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