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Comparison of simultaneous saccharification and fermentation and separate hydrolysis and fermentation processes for butanol production from rice straw

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Comparison of simultaneous saccharification and fermentation and separate hydrolysis and fermentation processes for butanol production from rice straw

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dc.contributor.author	Valles Sáez, Alejo
dc.contributor.author	Álvarez Hornos, Francisco Javier
dc.contributor.author	Martínez Soria, Vicente
dc.contributor.author	Marzal Doménech, Paula
dc.contributor.author	Gabaldón García, Carmen
dc.date.accessioned	2023-11-15T10:41:44Z
dc.date.available	2023-11-15T10:41:44Z
dc.date.issued	2020
dc.identifier.uri	https://hdl.handle.net/10550/91161
dc.description.abstract	Rice straw (RS) is one of the lignocellulosic wastes with the highest global production. The main objective of this study was to maximise the butanol production by Clostridium beijerinckii DSM 6422 from RS pretreated by microwave-assisted hydrothermolysis. Two different fermentation strategies were compared: separate hydrolysis and fermentation (SHF, two-step process) and simultaneous saccharification and fermentation (SSF, one-step process). In parallel, the variables that significantly affected the butanol production were screened by using fractional factorial designs. Butanol concentration and productivity at 48 h were, respectively, 8% and 173% higher in SSF than in SHF. A one-step process was more efficient than a two-step process, especially considering the time savings derived from much higher productivity. From these results, SSF was further optimised by response surface methodology with central composite design over the key factors on the butanol production at 48 h: initial pH, enzyme loading and yeast extract concentration. The optimum point yielded a butanol productivity of 0.114 g L-1h−1, with a butanol-biomass ratio of 51 g kg−1 of raw RS (ABE-biomass ratio of 77.0 g kg−1 of raw RS). The parameter with the greatest effect was enzyme loading, with an optimal value of 13.5 FPU g-dw-1. This study showed that microwave-processed RS has great potential as a substrate for the butanol production from ABE fermentation when combining process stages by SSF.
dc.language.iso	eng
dc.relation.ispartof	Fuel, 2020, vol. 282, p. 118831
dc.source	Valles Sáez, Alejo Álvarez Hornos, Francisco Javier Martínez Soria, Vicente Marzal Doménech, Paula Gabaldón García, Carmen (2020). Comparison of simultaneous saccharification and fermentation and separate hydrolysis and fermentation processes for butanol production from rice straw. Fuel 282 118831
dc.subject	Química
dc.title	Comparison of simultaneous saccharification and fermentation and separate hydrolysis and fermentation processes for butanol production from rice straw
dc.type	journal article
dc.date.updated	2023-11-15T10:41:45Z
dc.identifier.doi	10.1016/j.fuel.2020.118831
dc.identifier.idgrec	141335
dc.rights.accessRights	open access