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Received June 22, 2008
Accepted December 8, 2008
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Application of full permeate recycling to very high gravity ethanol fermentation from corn
1The Key Laboratory of Industrial Biotechnlogy, Ministry of Education, 1800 Lihu Road, Wuxi 214122, China 2Laboratory of Biomass Resources and biotransformation, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
biomass_jnu@126.com
Korean Journal of Chemical Engineering, May 2009, 26(3), 719-723(5), 10.1007/s11814-009-0120-z
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Abstract
A ceramic membrane with pore size of 0.2 μm was used to percolate grain stillage of very high gravity (VHG) ethanol fermentation from corn, and the micro-filtration permeate was completely recycled for the cooking step in the next fermentation process. The concentrations of solids, sugars, total nitrogen and Na+ in the grain stillage and permeate reached a relative steady state after two or three batches of filtration and recycling process. There are no negative effects of by-products on VHG ethanol fermentation, and the final ethanol yield was above 15% (v/v). The conditions of filtration were examined to determine the optimum conditions for the process and included an initial flux of clean water above 550 L·m^(-2)·h^(-1) (0.1 MPa), an operating differential pressure of 0.15 MPa, an operating temperature above 70 ℃, and a permeation flux greater than 136 L·m^(-2)·h^(-1). It could be concluded that full permeate recycling during ethanol production was an efficient process that resulted in less pollution and less energy consumption.
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