A short review on SSF – an interesting process option for ethanol production from lignocellulosic feedstocksReportar como inadecuado




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Biotechnology for Biofuels

, 1:7

First Online: 01 May 2008Received: 18 March 2008Accepted: 01 May 2008

Abstract

Simultaneous saccharification and fermentation SSF is one process option for production of ethanol from lignocellulose. The principal benefits of performing the enzymatic hydrolysis together with the fermentation, instead of in a separate step after the hydrolysis, are the reduced end-product inhibition of the enzymatic hydrolysis, and the reduced investment costs. The principal drawbacks, on the other hand, are the need to find favorable conditions e.g. temperature and pH for both the enzymatic hydrolysis and the fermentation and the difficulty to recycle the fermenting organism and the enzymes. To satisfy the first requirement, the temperature is normally kept below 37°C, whereas the difficulty to recycle the yeast makes it beneficial to operate with a low yeast concentration and at a high solid loading. In this review, we make a brief overview of recent experimental work and development of SSF using lignocellulosic feedstocks. Significant progress has been made with respect to increasing the substrate loading, decreasing the yeast concentration and co-fermentation of both hexoses and pentoses during SSF. Presently, an SSF process for e.g. wheat straw hydrolyzate can be expected to give final ethanol concentrations close to 40 g L with a yield based on total hexoses and pentoses higher than 70%.

Electronic supplementary materialThe online version of this article doi:10.1186-1754-6834-1-7 contains supplementary material, which is available to authorized users.

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Autor: Kim Olofsson - Magnus Bertilsson - Gunnar Lidén

Fuente: https://link.springer.com/



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