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Bioconversion of barley straw and corn stover to butanol (a biofuel) in integrated fermentation and simultaneous product recovery bioreactors ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
19086 43044 2014 11 PDF Available
Title
Bioconversion of barley straw and corn stover to butanol (a biofuel) in integrated fermentation and simultaneous product recovery bioreactors ☆
Abstract

•Butanol was produced from barley straw and corn stover hydrolysates.•Butanol production by fermentation and recovery was integrated.•Concentrated sugar solutions of these hydrolysates were fermented successfully.•Productivities were increased by a factor of two.•Process integration would reduce the cost of production of this novel biofuel.

In these studies concentrated sugar solutions of barley straw and corn stover hydrolysates were fermented using Clostridium beijerinckii P260 with simultaneous product recovery and compared with the performance of a control glucose batch fermentation process. The control glucose batch fermentation resulted in the production of 23.25 g L−1 ABE from 55.7 g L−1 glucose solution resulting in an ABE productivity and yield of 0.33 g L−1 h−1 and 0.42, respectively. The control reactor (I) was started with 62.5 g L−1 initial glucose and the culture left 6.8 g L−1 unused sugar due to butanol toxicity resulting in incomplete sugar utilization. Barley straw (BS) hydrolysate sugars (90.3 g L−1) resulted in the production of 47.20 g L−1 ABE with a productivity of 0.60 g L−1 h−1 and a yield of 0.42. Fermentation of corn stover (CS) hydrolysate sugars (93.1 g L−1) produced 50.14 g L−1 ABE with a yield of 0.43 and a productivity of 0.70 g L−1 h−1. These productivities are 182–212% higher than the control run. The culture was able to use 99.4–100% sugars (CS & BS respectively) present in these hydrolysates and improve productivities which were possible due to simultaneous product removal. Use of >100 g L−1 hydrolysate sugars was not considered as it would have been toxic to the culture in the integrated (simultaneous fermentation and recovery) process.

Keywords
Barley straw hydrolysate; Corn stover hydrolysate; Butanol/ABE; Simultaneous product recovery; Productivity
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Bioconversion of barley straw and corn stover to butanol (a biofuel) in integrated fermentation and simultaneous product recovery bioreactors ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 92, Issue 3, July 2014, Pages 298–308
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us