Multifeed simultaneous saccharification and fermentation enables high gravity submerged fermentation of lignocellulose.

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Franzén, Carl Johan,1966Chalmers tekniska högskola,Chalmers University of Technology (author)

Multifeed simultaneous saccharification and fermentation enables high gravity submerged fermentation of lignocellulose.

Article/chapterEnglish2015

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2015

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LIBRIS-ID:oai:research.chalmers.se:6b8990dd-0d92-4992-8825-b298b9cfdc18
https://research.chalmers.se/publication/227614URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:kon swepub-publicationtype
Subject category:vet swepub-contenttype

Notes

Today, second generation bioethanol production is becoming established in production plants across the world. In addition to its intrinsic value, the process can be viewed as a model process for biotechnological conversion of recalcitrant lignocellulosic raw materials to a range of chemicals and other products. So called High Gravity operation, i.e. fermentation at high solids loadings, represents continued development of the process towards higher product concentrations and productivities, and improved energy and water economy. We have employed a systematic, model-driven approach to the design of feeding schemes of solid substrate, active yeast adapted to the actual substrate, and enzymes to fed-batch simultaneous saccharification and co-fermentation (Multifeed SSCF) of steam-pretreated lignocellulosic materials in stirred tank reactors. With this approach, mixing problems were avoided even at water insoluble solids contents of 22%, leading to ethanol concentrations of 56 g/L within 72 hours of SSCF on wheat straw. Similar fermentation performance was verified in 10 m3 demonstration scale using wheat straw, and in lab scale on birch and spruce, using several yeast strains. The yeast was propagated in the liquid fraction obtained by press filtration of the pretreated slurry. Yet, even with such preadaptation and repeated addition of fresh cells, the viability in the SSCF dropped due to interactions between lignocellulose-derived inhibitors, the produced ethanol and the temperature. Decreasing the temperature from 35 to 30°C when the ethanol concentration reached 40-50 g/L resulted in rapid initial hydrolysis, maintained fermentation capacity, lower residual glucose and xylose and ethanol concentrations above 60 g/L.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Industriell bioteknik hsv//swe
ENGINEERING AND TECHNOLOGY Industrial Biotechnology 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
TEKNIK OCH TEKNOLOGIER Industriell bioteknik Annan industriell bioteknik hsv//swe
ENGINEERING AND TECHNOLOGY Industrial Biotechnology Other Industrial Biotechnology hsv//eng
biorefinery
kinetic modeling
flocculation
bioethanol
scale-up
Lignocellulose
fed-batch high gravity

Added entries (persons, corporate bodies, meetings, titles ...)

Wang, Ruifei,1985Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ruifei (author)
Westman, Johan,1983Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)johanwe (author)
Xiros, Charilaos,1973Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)xiros (author)
Koppram, Rakesh,1986Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)koppram (author)
Tomas-Pejo, Elia,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)elia (author)
Olsson, Lisbeth,1963Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lisbetho (author)
Chalmers tekniska högskola (creator_code:org_t)

Related titles

In:Recent Advances in Fermentation Technology (RAFT 11), Clearwater Beach, Florida, USA, November 8-11, 2015. Oral presentation.

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https://research.chalmers.se/publication/227614

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Industrial Biote ...

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