Life cycle impacts of ethanol production from spruce wood chips under high gravity conditions

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Janssen, Mathias,1973Chalmers tekniska högskola,Chalmers University of Technology (författare)

Life cycle impacts of ethanol production from spruce wood chips under high gravity conditions

Artikel/kapitelEngelska2016

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2016-03-05
Springer Science and Business Media LLC,2016
electronicrdacarrier

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LIBRIS-ID:oai:research.chalmers.se:b6459039-ff81-49b0-bb2a-52e3765d4390
https://doi.org/10.1186/s13068-016-0468-3DOI
https://research.chalmers.se/publication/232817URI

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Språk:engelska
Sammanfattning på:engelska

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BackgroundDevelopment of more sustainable biofuel production processes is ongoing, and technology to run these processes at a high dry matter content, also called high-gravity conditions, is one option. This paper presents the results of a life cycle assessment (LCA) of such a technology currently in development for the production of bio-ethanol from spruce wood chips.ResultsThe cradle-to-gate LCA used lab results from a set of 30 experiments (or process configurations) in which the main process variable was the detoxification strategy applied to the pretreated feedstock material. The results of the assessment show that a process configuration, in which washing of the pretreated slurry is the detoxification strategy, leads to the lowest environmental impact of the process. Enzyme production and use are the main contributors to the environmental impact in all process configurations, and strategies to significantly reduce this contribution are enzyme recycling and on-site enzyme production. Furthermore, a strong linear correlation between the ethanol yield of a configuration and its environmental impact is demonstrated, and the selected environmental impacts show a very strong cross-correlation (r^2 > 0.9 in all cases) which may be used to reduce the number of impact categories considered from four to one (in this case, global warming potential). Lastly, a comparison with results of an LCA of ethanol production under high-gravity conditions using wheat straw shows that the environmental performance does not significantly differ when using spruce wood chips. For this comparison, it is shown that eutrophication potential also needs to be considered due to the fertilizer use in wheat cultivation.ConclusionsThe LCA points out the environmental hotspots in the ethanol production process, and thus provides input to the further development of the high-gravity technology. Reducing the number of impact categories based only on cross-correlations should be done with caution. Knowledge of the analyzed system provides further input to the choice of impact categories.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Naturresursteknik Annan naturresursteknik hsv//swe
ENGINEERING AND TECHNOLOGY Environmental Engineering Other Environmental Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Industriell bioteknik Bioprocessteknik hsv//swe
ENGINEERING AND TECHNOLOGY Industrial Biotechnology Bioprocess Technology hsv//eng
TEKNIK OCH TEKNOLOGIER Industriell bioteknik Bioenergi hsv//swe
ENGINEERING AND TECHNOLOGY Industrial Biotechnology Bioenergy hsv//eng
Technology development
Acidification potential
Global warming potential
Ethanol production
High-gravity hydrolysis and fermentation
Spruce wood chips
Renewable and non-renewable energy use
Life cycle assessment
Photochemical ozone creation potential
Eutrophication potential

Biuppslag (personer, institutioner, konferenser, titlar ...)

Xiros, Charilaos,1973Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)xiros (författare)
Tillman, Anne-Marie,1958Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)amt (författare)
Chalmers tekniska högskola (creator_code:org_t)

Sammanhörande titlar

Ingår i:Biotechnology for Biofuels: Springer Science and Business Media LLC9:1, s. 53-1754-68341754-6834

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