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Impact of Furfural on Rapid Ethanol Production Using a Membrane Bioreactor

Päivi Ylitervo (Institutionen för kemi- och bioteknik, Industriell Bioteknik ) ; Carl Johan Franzén (Institutionen för kemi- och bioteknik, Industriell Bioteknik ) ; Mohammad J. Taherzadeh
Energies (1996-1073). Vol. 6 (2013), 3, p. 1604-1617.
[Artikel, refereegranskad vetenskaplig]

A membrane bioreactor was developed to counteract the inhibition effect of furfural in ethanol production. Furfural, a major inhibitor in lignocellulosic hydrolyzates, is a highly toxic substance which is formed from pentose sugars released during the acidic degradation of lignocellulosic materials. Continuous cultivations with complete cell retention were performed at a high dilution rate of 0.5 h(-1). Furfural was added directly into the bioreactor by pulse injection or by addition into the feed medium to obtain furfural concentrations ranging from 0.1 to 21.8 g L-1. At all pulse injections of furfural, the yeast was able to convert the furfural very rapidly by in situ detoxification. When injecting 21.8 g L-1 furfural to the cultivation, the yeast converted it by a specific conversion rate of 0.35 g g(-1) h(-1). At high cell density, Saccharomyces cerevisiae could tolerate very high furfural levels without major changes in the ethanol production. During the continuous cultures when up to 17.0 g L-1 furfural was added to the inlet medium, the yeast successfully produced ethanol, whereas an increase of furfural to 18.6 and 20.6 g L-1 resulted in a rapidly decreasing ethanol production and accumulation of sugars in the permeate. This study show that continuous ethanol fermentations by total cell retention in a membrane bioreactor has a high furfural tolerance and can conduct rapid in situ detoxification of medium containing high furfural concentrations.

Nyckelord: ethanol, Saccharomyces cerevisiae, membrane bioreactor, cross-flow filtration, furfural conversion kinetics



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Denna post skapades 2013-04-22. Senast ändrad 2014-09-02.
CPL Pubid: 175879

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Industriell Bioteknik (2008-2014)

Ämnesområden

Energi
Livsvetenskaper
Hållbar utveckling
Kemi
Industriell bioteknik

Chalmers infrastruktur

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