Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10395000 | Bioresource Technology | 2011 | 8 Pages |
Abstract
The feasibility of replacing yeast extract (YE) by corn steep liquor (CSL), a low cost nutrient source, for syngas fermentation to produce ethanol using Clostridium strain P11 was investigated. About 32% more ethanol (1.7 g Lâ1) was produced with 20 g Lâ1 CSL media in 250-mL bottle fermentations compared to media with 1 g Lâ1 YE after 360 h. Maximum ethanol concentrations after 360 h of fermentation in a 7.5-L fermentor with 10 and 20 g Lâ1 CSL media were 8.6 and 9.6 g Lâ1, respectively, which represent 57% and 60% of the theoretical ethanol yields from CO. Only about 6.1 g Lâ1 of ethanol was obtained in the medium with 1 g Lâ1 YE after 360 h, which represents 53% of the theoretical ethanol yield from CO. The use of CSL also enhanced butanol production by sevenfold compared to YE in bottle fermentations. These results demonstrate that CSL can replace YE as the primary medium component and significantly enhance ethanol production by Clostridium strain P11.
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Authors
Prasanth Maddipati, Hasan K. Atiyeh, Danielle D. Bellmer, Raymond L. Huhnke,