Cellulosic Butanol (ABE) Biofuel Production from Sweet Sorghum Bagasse (SSB): Impact of Hot Water Pretreatment and Solid
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Cellulosic Butanol (ABE) Biofuel Production from Sweet Sorghum Bagasse (SSB): Impact of Hot Water Pretreatment and Solid Loadings on Fermentation Employing Clostridium beijerinckii P260 N. Qureshi 1 & S. Liu 2 & S. Hughes 2 & D. Palmquist 3 & B. Dien 1 & B. Saha 1
# Springer Science+Business Media New York (outside the USA) 2016
Abstract A novel butanol fermentation process was developed in which sweet sorghum bagasse (SSB) was pretreated using liquid hot water (LHW) pretreatment technique followed by enzymatic hydrolysis and butanol (acetone butanol ethanol (ABE)) fermentation. A pretreatment temperature of 200 °C resulted in the generation of a hydrolyzate that inhibited butanol fermentation. When SSB pretreatment temperature was decreased to 190 °C (0-min holding time), the hydrolyzate was successfully fermented without inhibition and an ABE productivity of 0.51 g L−1 h−1 was achieved which is comparable to the 0.49 g L−1 h−1 observed in the control fermentation where glucose was used as a feedstock. These results are based on the use of 86 g L−1 SSB solid loadings in the pretreatment reactors. We were also able to increase SSB solid loadings from 120 to 200 g L−1 in the pretreatment step (190 °C) followed by hydrolysis and butanol fermentation. As pretreatment solid loadings increased, ABE yield remained in the range of 0.38–0.46. In these studies, a maximum ABE concentration of 16.88 g L−1 was achieved. Mention of trade names or commercial products in this article is solely for the purpose of providing scientific information and does not imply recommendation or endorsement by the United States Department of Agriculture. USDA is an equal opportunity provider and employer. * N. Qureshi [email protected]
1
United States Department of Agriculture (USDA), Agricultural Research Service (ARS), National Center for Agricultural Utilization Research (NCAUR), Bioenergy Research Unit, 1815 N. University Street, Peoria, IL 61604, USA
2
USDA, ARS, NCAUR, Renewable Product Technology Research Unit, 1815 N. University Street, Peoria, IL 61604, USA
3
USDA, ARS, Midwest Area, 1815 N. University Street, Peoria, IL 61604, USA
Using the LHW pretreatment technique, 88.40–96.00 % of polymeric sugars (cellulose + hemicellulose) were released in the SSB hydrolyzate. The LHW pretreatment technique does not require chemical additions and is environmentally friendly, and the hydrolyzate can be used successfully for butanol fermentation. Keywords Sweet sorghum bagasse (SSB) . Liquid hot water (LWH) pretreatment . Butanol fermentation . Inhibitors . ABE productivity . ABE yield
Introduction During recent years, oil prices have been volatile driven in part to political instabilities in major oil-producing regions. As a result of this, efforts have been focused on bioconversion of renewable biomass to biofuels such as ethanol, biodiesel, and butanol. Butanol is a biofuel that has superior fuel properties compared to ethanol [1, 2] including a higher energy content and miscibility with transportation oil in any proportion.
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