Abstract
Pretreatment method for rapeseed straw by sodium hydroxide was investigated for production of bioethanol and biobutanol. Various pretreatment parameters, including temperature, time, and sodium hydroxide concentration were optimized using a statistical method which is a central composite design of response surface methodology. In the case of sodium hydroxide pretreatment, optimal pretreatment conditions were found to be 7.9% sodium hydroxide concentration, 5.5 h of reaction time, and 68.4 °C of reaction temperature. The maximum glucose yield which can be recovered by enzymatic hydrolysis at the optimum conditions was 95.7% and the experimental result was 94.0 ± 4.8%. This experimental result was in agreement with the model prediction. An increase of surface area and pore size in pretreated rapeseed straw by sodium hydroxide pretreatment was observed by scanning electron microscope.
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Alvira P, Tomas-Pejo E, Balesteros M, Negto MJ (2010) Pretreatment technologies for an efficient bioethanol production process based on enzymatic hydrolysis: a review. Bioresour Technol 101:4851–4861
Jeong TS, Um BH, Kim JS, Oh KK (2010) Optimizing dilute-acid pretreatment of rapeseed straw for extraction of hemicelluloses. Appl Biochem Biotechnol 161:22–33
Moiser N, Wyman C, Dale B, Elander R, Lee YY, Holtzapple M (2005) Features of promising technologies for pretreatment of lignocellulosic biomass. Bioresour Technol 96:673–686
Schell DJ, Farmer JJ, Newman M, Mcmillan JD (2003) Dilute-sulfuric acid pretreatment of corn stover in pilot-scale reactor: investigation of yields, kinetics, and enzymatic digestibilities of solids. Appl Biochem Biotechnol 105:69–85
Balat M (2011) Production of bioethanol from lignocellulosic materials via the biochemical pathway: a review. Energy Convers Manag 52:858–875
Silverstein RA, Chen Y, Sharma-Shivappa RR, Boyette MD, Osborne J (2007) A comparison of chemical pretreatment methods for improving saccharification of cotton stalks. Bioresour Technol 98:3000–3011
Tarkov H, Feist WC (1969) A mechanism for improving the digestibility of lignocellulosic materials with dilute alkali and liquid ammonia. Adv Chem 95(1):197–218
Fang LT, Gharpuray MM, Lee YH (1987) Cellulose hydrolysis biotechnology monographs. Springer, Berlin
Díaz MJ, Cara C, Ruiz E, Romero I, Moya M, Castro E (2010) Hydrothermal pre-treatment of rapeseed straw. Bioresour Technol 101(7):2428–2435
Lu X, Zhang Y, Angelidaki I (2009) Optimization of H2SO4-catalyzed hydrothermal pretreatment of rapeseed straw for bioconversion to ethanol: focusing on pretreatment at high solids content. Bioresour Technol 100(12):3048–3053
Castro E, Díaz MJ, Cara C, Ruiz E, Romero I, Moya M (2011) Dilute acid pretreatment of rapeseed straw for fermentable sugar generation. Bioresour Technol 102(2):1270–1276
Kang KE, Jeong GT, Sunwoo C, Park DH (2011) Pretreatment of rapeseed straw by soaking in aqueous ammonia. Bioprocess Biosyst Eng. doi:10.1007/s00449-011-0606-z
Jeong GT, Park DH (2010) Production of sugars and levulinic acid from marine biomass Gelidium amansii. Appl Biochem Biotechnol 161:41–52
Jeong GT, Park DH (2009) Optimization of biodiesel production from castor oil using response surface methodology. Appl Biochem Biotechnol 156:431–441
NREL (National Renewable Energy Laboratory) in Golden, CO (2008). ‘Enzymatic saccharification of lignocellulosic biomass’ in the LAP (Laboratory Analytical Procedure)
Gould JM (1985) Studies on the mechanism of alkaline peroxide delignification of agricultural residues. Biotechnol Bioeng 27:225–231
Sharama SK, Kalra KL, Grewal HS (2002) Enzymatic saccharification of pretreated sunflower stalks. Biomass Bioenergy 23:237–243
Draude KM, Kurniawan CB, Duff SJB (2001) Effect of oxygen delignification on the rate and extent of enzymatic hydrolysis of lignocellulosic material. Bioresour Technol 79:113–120
Mooney CA, Mansfield SD, Touhy MG, Saddler JN (1998) The effect of initial pore volume and lignin content on the enzymatic hydrolysis of softwoods. Bioresour Technol 64:113–119
Millet MA, Baker AJ, Scatter LD (1976) Physical and chemical pretreatment for enhancing cellulose. Appl Microbiol Biotechnol 29:462–468
Akhtar MS, Saleem M, Akhtar MW (2001) Saccharification of lignocellulosic materials by the cellulases of Bacillus subtilis. Int J Agr Biol 3:199–202
Li Y, Ruan R, Chen PL, Liu Z, Pan X, Lin X, Liu Y, Mok CK, Yang T (2004) Enzymatic hydrolysis of corn stover pretreated by combined dilute alkaline treatment and homogenization. Trans ASAE 47(3):821–825
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This work is the outcome of the fostering project of the Specialized Graduate School, which is financially supported by the Ministry of Knowledge Economy.
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K. E. Kang and G.-T. Jeong have contributed equally to this work.
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Kang, K.E., Jeong, GT. & Park, DH. Pretreatment of rapeseed straw by sodium hydroxide. Bioprocess Biosyst Eng 35, 705–713 (2012). https://doi.org/10.1007/s00449-011-0650-8
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DOI: https://doi.org/10.1007/s00449-011-0650-8