BioChem - DOS

Techno-economic implications of improved high gravity corn mash fermentation

Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

Kollaras, A.; Kavanagh, J.M.; Bell, G.L.; Purkovic, D.; Mandarakas, S.; Arcenal, P.; Ng, W.S.; Routledge, K.S.; Selwood, D.H.; Koutouridis, P.; Paras, F.E.; Milic, P.; Tirado-Escobar, E.S.; Moore, M.J.B.; Bell, P.J.L.; Attfield, P.V.

The performance of Saccharomyces cerevisiae MBG3964, a strain able to tolerate >18% v/v ethanol, was compared to leading industrial ethanol strain, Fermentis Ethanol Red, under high gravity corn mash fermentation conditions. Compared to the industrial ethanol strain, MBG3964 gave increased alcohol yield (140gL<SUP>-1</SUP> vs. 126gL<SUP>-1</SUP>), lower residual sugar (4gL<SUP>-1</SUP> vs. 32gL<SUP>-1</SUP>), and lower glycerol (11gL<SUP>-1</SUP> vs. 12gL<SUP>-1</SUP>). After 72h fermentation, MBG3964 showed about 40% viability, whereas the control yeast was only about 3% viable. Based on modelling, the higher ethanol tolerant yeast could increase the profitability of a corn-ethanol plant and help it remain viable through higher production, lower unit heating requirements and extra throughput. A typical 50Mgaly<SUP>-1</SUP> dry mill ethanol plant that sells dried distiller's grain could potentially increase its profit by nearly $US3.4My<SUP>-1</SUP> due solely to the extra yield, and potentially another $US4.1My<SUP>-1</SUP> if extra throughput is possible.

2011

Elsevier Applied Science

0960-8524

102

16

pp.7521-7525

10.1016/j.biortech.2011.04.094

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART56967684

Saccharomyces cerevisiae; Corn; High gravity fermentation; Ethanol