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de Araujo Guilherme A, Dantas PVF, Padilha CEDA, Dos Santos ES, de Macedo GR. Ethanol production from sugarcane bagasse: Use of different fermentation strategies to enhance an environmental-friendly process. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 234:44-51. [PMID: 30599329 DOI: 10.1016/j.jenvman.2018.12.102] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 12/06/2018] [Accepted: 12/26/2018] [Indexed: 06/09/2023]
Abstract
Ethanol production by simultaneous saccharification and fermentation (SSF) using sugarcane bagasse as substrate was developed using batch and fed-batch mode. Acid, alkali, hydrothermal and hydrogen peroxide pretreatments to the sugarcane bagasse were tested. Experiments were carried out to optimize the enzyme load of cellulases and β-glucosidase. Four strains, two of Saccharomyces cerevisiae and two of Kluyveromyces marxianus yeast species were evaluate using SSF to produce ethanol. A kinetic study in bioreactor was carried out to optimize the SSF. The batch process was optimized using 1.0 g/L of inoculum, 15.0 FPU/g cellulose of cellulases and 6.0% of initial cellulose reaching 92.0% of theoretical ethanol yield after 18 h using the bagasse pretreate by acid-alkali and S. cerevisiae PE-2. The fed-batch process with enzyme load three times lower than that was used in batch process, obtained 88% of theoretical ethanol yield in 40 h. Therefore, the use of the lignocellulosic biomass (sugarcane bagasse) for producing a biofuel (ethanol) reduces the need for oil and is an environmental-friendly process.
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Affiliation(s)
- Alexandre de Araujo Guilherme
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, UFRN, Av. Senador Salgado Filho, 3.000, Campus Universitário, Lagoa Nova, Bloco 16, Unidade II, Natal, Rio Grande do Norte, 59.078-970, Brazil
| | - Paulo Victor Fortunato Dantas
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, UFRN, Av. Senador Salgado Filho, 3.000, Campus Universitário, Lagoa Nova, Bloco 16, Unidade II, Natal, Rio Grande do Norte, 59.078-970, Brazil
| | - Carlos Eduardo de Araújo Padilha
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, UFRN, Av. Senador Salgado Filho, 3.000, Campus Universitário, Lagoa Nova, Bloco 16, Unidade II, Natal, Rio Grande do Norte, 59.078-970, Brazil
| | - Everaldo Silvino Dos Santos
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, UFRN, Av. Senador Salgado Filho, 3.000, Campus Universitário, Lagoa Nova, Bloco 16, Unidade II, Natal, Rio Grande do Norte, 59.078-970, Brazil.
| | - Gorete Ribeiro de Macedo
- Department of Chemical Engineering, Federal University of Rio Grande do Norte, UFRN, Av. Senador Salgado Filho, 3.000, Campus Universitário, Lagoa Nova, Bloco 16, Unidade II, Natal, Rio Grande do Norte, 59.078-970, Brazil
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Preliminary design for simultaneous saccharification and fermentation stages for ethanol production from sugar cane bagasse. Chem Eng Res Des 2017. [DOI: 10.1016/j.cherd.2017.08.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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You Y, Li P, Lei F, Xing Y, Jiang J. Enhancement of ethanol production from green liquor-ethanol-pretreated sugarcane bagasse by glucose-xylose cofermentation at high solid loadings with mixed Saccharomyces cerevisiae strains. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:92. [PMID: 28413447 PMCID: PMC5390481 DOI: 10.1186/s13068-017-0771-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Accepted: 03/22/2017] [Indexed: 05/28/2023]
Abstract
BACKGROUND Efficient cofermentation of glucose and xylose is necessary for economically feasible bioethanol production from lignocellulosic biomass. Here, we demonstrate pretreatment of sugarcane bagasse (SCB) with green liquor (GL) combined with ethanol (GL-Ethanol) by adding different GL amounts. The common Saccharomyces cerevisiae (CSC) and thermophilic S. cerevisiae (TSC) strains were used and different yeast cell mass ratios (CSC to TSC) were compared. The simultaneous saccharification and cofermentation (SSF/SSCF) process was performed by 5-20% (w/v) dry substrate (DS) solid loadings to determine optimal conditions for the co-consumption of glucose and xylose. RESULTS Compared to previous studies that tested fermentation of glucose using only the CSC, we obtained higher ethanol yield and concentration (92.80% and 23.22 g/L) with 1.5 mL GL/g-DS GL-Ethanol-pretreated SCB at 5% (w/v) solid loading and a CSC-to-TSC yeast cell mass ratio of 1:2 (w/w). Using 10% (w/v) solid loading under the same conditions, the ethanol concentration increased to 42.53 g/L but the ethanol yield decreased to 84.99%. In addition, an increase in the solid loading up to a certain point led to an increase in the ethanol concentration from 1.5 mL GL/g-DS-pretreated SCB. The highest ethanol concentration (68.24 g/L) was obtained with 15% (w/v) solid loading, using a CSC-to-TSC yeast cell mass ratio of 1:3 (w/w). CONCLUSIONS GL-Ethanol pretreatment is a promising pretreatment method for improving both glucan and xylan conversion efficiencies of SCB. There was a competitive relationship between the two yeast strains, and the glucose and xylose utilization ability of the TSC was better than that of the CSC. Ethanol concentration was obviously increased at high solid loading, but the yield decreased as a result of an increase in the viscosity and inhibitor levels in the fermentation system. Finally, the SSCF of GL-Ethanol-pretreated SCB with mixed S. cerevisiae strains increased ethanol concentration and was an effective conversion process for ethanol production at high solid loading.
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Affiliation(s)
- Yanzhi You
- Department of Chemistry and Chemical Engineering, MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing, 100083 China
| | - Pengfei Li
- GuangXi Key Laboratory of Chemistry and Engineering of Forest Products, College of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, 530006 China
| | - Fuhou Lei
- GuangXi Key Laboratory of Chemistry and Engineering of Forest Products, College of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, 530006 China
| | - Yang Xing
- Department of Chemistry and Chemical Engineering, MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing, 100083 China
| | - Jianxin Jiang
- Department of Chemistry and Chemical Engineering, MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing, 100083 China
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Lopes ML, Paulillo SCDL, Godoy A, Cherubin RA, Lorenzi MS, Giometti FHC, Bernardino CD, Amorim Neto HBD, Amorim HVD. Ethanol production in Brazil: a bridge between science and industry. Braz J Microbiol 2016; 47 Suppl 1:64-76. [PMID: 27818090 PMCID: PMC5156502 DOI: 10.1016/j.bjm.2016.10.003] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 10/05/2016] [Indexed: 12/13/2022] Open
Abstract
In the last 40 years, several scientific and technological advances in microbiology of the fermentation have greatly contributed to evolution of the ethanol industry in Brazil. These contributions have increased our view and comprehension about fermentations in the first and, more recently, second-generation ethanol. Nowadays, new technologies are available to produce ethanol from sugarcane, corn and other feedstocks, reducing the off-season period. Better control of fermentation conditions can reduce the stress conditions for yeast cells and contamination by bacteria and wild yeasts. There are great research opportunities in production processes of the first-generation ethanol regarding high-value added products, cost reduction and selection of new industrial yeast strains that are more robust and customized for each distillery. New technologies have also focused on the reduction of vinasse volumes by increasing the ethanol concentrations in wine during fermentation. Moreover, conversion of sugarcane biomass into fermentable sugars for second-generation ethanol production is a promising alternative to meet future demands of biofuel production in the country. However, building a bridge between science and industry requires investments in research, development and transfer of new technologies to the industry as well as specialized personnel to deal with new technological challenges.
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