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Bio-oil upgrading strategies to improve PHA production from selected aerobic mixed cultures

Paper ID Volume ID Publish Year Pages File Format Full-Text
33317 44969 2014 11 PDF Available
Title
Bio-oil upgrading strategies to improve PHA production from selected aerobic mixed cultures
Abstract

•Pyrolysis bio-oil can be directly used for enrichment of PHA accumulating organisms.•Bio-oil upgrading using distillation/fermentation improves PHA production capacity.•VFAs content of bio-oil can be increased through acidogenic fermentation.•PHA production yield of 0.63 Cmmol HA/Cmmol S was obtained with fermented bio-oil.

Recent research on polyhydroxyalkanoates (PHAs) has focused on developing cost-effective production processes using low-value or industrial waste/surplus as substrate. One of such substrates is the liquid fraction resulting from pyrolysis processes, bio-oil. In this study, valorisation of bio-oil through PHA production was investigated. The impact of the complex bio-oil matrix on PHA production by an enriched mixed culture was examined. The performance of the direct utilization of pure bio-oil was compared with the utilization of three defined substrates contained in this bio-oil: acetate, glucose and xylose. When compared with acetate, bio-oil revealed lower capacity for polymer production as a result of a lower polymer yield on substrate and a lower PHA cell content. Two strategies for bio-oil upgrade were performed, anaerobic fermentation and vacuum distillation, and the resulting liquid streams were tested for polymer production. The first one was enriched in volatile fatty acids and the second one mainly on phenolic and long-chain fatty acids. PHA accumulation assays using the upgraded bio-oils attained polymer yields on substrate similar or higher than the one achieved with acetate, although with a lower PHA content. The capacity to use the enriched fractions for polymer production has yet to be optimized. The anaerobic digestion of bio-oil could also open-up the possibility to use the fermented bio-oil directly in the enrichment process of the mixed culture. This would increase the selective pressure toward an optimized PHA accumulating culture selection.

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Bio-oil upgrading strategies to improve PHA production from selected aerobic mixed cultures
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Publisher
Database: Elsevier - ScienceDirect
Journal: New Biotechnology - Volume 31, Issue 4, 25 June 2014, Pages 297–307
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