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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Ethanol Production from High Solid Loading of Rice Straw by Simultaneous Saccharification and Fermentation in a Non-Conventional Reactor

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Roberto, Ines C. [1] ; Castro, Rafael C. A. [1] ; Silva, Joao Paulo A. [2] ; Mussatto, Solange I. [3]
Total Authors: 4
[1] Univ Sao Paulo, Dept Biotecnol, Escola Engn Lorena, BR-12602810 Lorena, SP - Brazil
[2] Univ Sao Paulo, Dept Engn Quim, Escola Engn Lorena, BR-12602810 Lorena, SP - Brazil
[3] Tech Univ Denmark, Novo Nordisk Fdn Ctr Biosustainabil, Bldg 220, DK-2800 Lyngby - Denmark
Total Affiliations: 3
Document type: Journal article
Source: ENERGIES; v. 13, n. 8 APR 2020.
Web of Science Citations: 0

Simultaneous saccharification and fermentation (SSF) at high solid loading is a potential approach to improve the economic feasibility of cellulosic ethanol. In this study, SSF using high loading of rice straw was assessed using a vertical ball mill reactor. First, the conditions of temperature and number of glass spheres were optimized at 8% (w/v) initial solids (41.5 degrees C, 18 spheres). Then, assays were carried out at higher solid loadings (16% and 24% w/v). At 8% or 16% solids, the fermentation efficiency was similar (eta(F)similar to 75%), but the ethanol volumetric productivity (Q(P)) reduced from 1.50 to 1.14 g/L.h. By increasing the solids to 24%, the process was strongly affected (eta(F) = 40% and Q(P) = 0.7 g/L.h). To overcome this drawback, three different feeding profiles of 24% pre-treated rice straw were investigated. Gradual feeding of the substrate (initial load of 16% with additions of 4% at 10 and 24 h) and an inoculum level of 3 g/L resulted in a high ethanol titer (52.3 g/L) with Q(P) of 1.1 g/L.h and eta(F) of 67%. These findings demonstrated that using a suitable fed-batch feeding strategy helps to overcome the limitations of SSF in batch mode caused by the use of high solid content. (AU)

FAPESP's process: 15/24813-6 - Assessment of a biochemical platform based on two streams model (C6 and C5) for conversion of rice straw into ethanol
Grantee:Ines Conceicao Roberto
Support type: Regular Research Grants
FAPESP's process: 13/13953-6 - Ethanol production from rice straw by simultaneous saccharification and fermentation employing a non-conventional stirred reactor
Grantee:Rafael Cunha de Assis Castro
Support type: Scholarships in Brazil - Doctorate