Next Article in Journal
Next Article in Special Issue
Previous Article in Journal
Previous Article in Special Issue
Int. J. Mol. Sci. 2007, 8(9), 920-932; doi:10.3390/i8090920
Article

A Possible Industrial Solution to Ferment Lignocellulosic Hydrolyzate to Ethanol: Continuous Cultivation with Flocculating Yeast

1, 2 and 3,*
Received: 2 July 2007; in revised form: 9 August 2007 / Accepted: 28 August 2007 / Published: 3 September 2007
(This article belongs to the Special Issue Biofuels R&D: Securing the Planet's Future Energy Needs)
View Full-Text   |   Download PDF [803 KB, uploaded 19 June 2014]
Abstract: The cultivation of toxic lignocellulosic hydrolyzates has become a challengingresearch topic in recent decades. Although several cultivation methods have been proposed,numerous questions have arisen regarding their industrial applications. The current workdeals with a solution to this problem which has a good potential application on anindustrial scale. A toxic dilute-acid hydrolyzate was continuously cultivated using a high-cell-density flocculating yeast in a single and serial bioreactor which was equipped with asettler to recycle the cells back to the bioreactors. No prior detoxification was necessary tocultivate the hydrolyzates, as the flocks were able to detoxify it in situ. The experimentswere successfully carried out at dilution rates up to 0.52 h-1. The cell concentration insidethe bioreactors was between 23 and 35 g-DW/L, while the concentration in the effluent ofthe settlers was 0.32 ± 0.05 g-DW/L. An ethanol yield of 0.42-0.46 g/g-consumed sugarwas achieved, and the residual sugar concentration was less than 6% of the initialfermentable sugar (glucose, galactose and mannose) of 35.2 g/L.
Keywords: Dilute-acid lignocellulosic hydrolysate; Saccharomyces cerevisiae; flocculating yeast; ethanol; glycerol; HMF; furfural; continuous cultivation Dilute-acid lignocellulosic hydrolysate; Saccharomyces cerevisiae; flocculating yeast; ethanol; glycerol; HMF; furfural; continuous cultivation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Purwadi, R.; Brandberg, T.; Taherzadeh, M.J. A Possible Industrial Solution to Ferment Lignocellulosic Hydrolyzate to Ethanol: Continuous Cultivation with Flocculating Yeast. Int. J. Mol. Sci. 2007, 8, 920-932.

AMA Style

Purwadi R, Brandberg T, Taherzadeh MJ. A Possible Industrial Solution to Ferment Lignocellulosic Hydrolyzate to Ethanol: Continuous Cultivation with Flocculating Yeast. International Journal of Molecular Sciences. 2007; 8(9):920-932.

Chicago/Turabian Style

Purwadi, Ronny; Brandberg, Tomas; Taherzadeh, Mohammad J. 2007. "A Possible Industrial Solution to Ferment Lignocellulosic Hydrolyzate to Ethanol: Continuous Cultivation with Flocculating Yeast." Int. J. Mol. Sci. 8, no. 9: 920-932.



Int. J. Mol. Sci. EISSN 1422-0067 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert