Production of butanol (a biofuel) from agricultural residues: Part I – Use of barley straw hydrolysate

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• 作者：Nasib Qureshi ; Badal C. Saha ; Bruce Dien ; Ronald E. Hector ; Michael A. Cotta
• 关键词：Butanol ; Clostridium beijerinckii P260 ; Agricultural residue hydrolysate ; Barley (Hordeum vulgare) straw ; Overliming ; Productivity ; Yield ; Fermentation
• 刊名：Biomass and Bioenergy
• 出版年：2010
• 出版时间：April 2010
• 年：2010
• 卷：34
• 期：4
• 页码：559-565
• 全文大小：344 K

文摘

Fermentation of dilute sulfuric acid barley straw hydrolysate (BSH; undiluted/untreated) by Clostridium beijerinckii P260 resulted in the production of 7.09 gL⁻¹ ABE (acetone butanol ethanol), an ABE yield of 0.33, and productivity of 0.10 gL⁻¹ h⁻¹. This level of ABE is much less than that observed in a control experiment (21.06 gL⁻¹) where glucose (initial concentration 60 gL⁻¹) was used as a substrate. In the control experiment, an ABE yield of 0.41 and productivity of 0.31 gL⁻¹ h⁻¹ were observed. This comparison suggested that BSH is toxic to the culture. To reduce this potential toxicity effect, BSH was treated with lime [Ca(OH)₂] followed by fermentation. The treated BSH resulted in a successful fermentation and ABE concentration of 26.64 gL⁻¹ was achieved. This was superior to both glucose and untreated BSH (initial sugar 60 gL⁻¹) fermentations. In this fermentation, an ABE yield of 0.43 and productivity of 0.39 gL⁻¹ h⁻¹ (390 % of untreated/undiluted BSH) was obtained. It should be noted that using lime treated BSH, a specific productivity of 0.55 h⁻¹ was obtained as compared to 0.12 h⁻¹ in the control fermentation suggesting that more carbon was directed to product formation.