Enhanced ethanol production by Clostridium ragsdalei from syngas by incorporating biochar in the fermentation medium.

Authors :: Sun X
Atiyeh HK
Kumar A
Zhang H
Source :: Bioresource technology [Bioresour Technol] 2018 Jan; Vol. 247, pp. 291-301. Date of Electronic Publication: 2017 Sep 09.
Publication Year :: 2018
Abstract: Biochar contains minerals and metals that can serve as nutrients for acetogens to produce ethanol via syngas fermentation. In this study, four fermentation media containing biochar from switchgrass (SGBC), forage sorghum (FSBC), red cedar (RCBC) and poultry litter (PLBC) were compared with standard yeast extract (YE) medium for syngas fermentation using Clostridium ragsdalei. Fermentations were performed in 250mL bottle reactors at 150rpm and 37°C with syngas containing CO:H <subscript>2</subscript> :CO <subscript>2</subscript> (40:30:30) by volume. Results showed that media containing RCBC and PLBC improved ethanol production by 16.3% and 58.9%, respectively, compared to YE medium. C. ragsdalei consumed 69% more H <subscript>2</subscript> and 40% more CO in PLBC medium compared to YE medium. However, no enhancement of ethanol production was observed in SGBC and FSBC media. The highest release of Na, K, Ca, Mg, S and P was from PLBC, which was considered to contribute in enhancement of ethanol production.<br /> (Copyright © 2017 Elsevier Ltd. All rights reserved.)

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