Journal
GREEN CHEMISTRY
Volume 20, Issue 16, Pages 3790-3803Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8gc01759j
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Funding
- National Centre for Research and Development (Poland) under the LIDER V programme [LIDER/013/261/L-5/13/NCBR/2014]
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In light of an increasing demand for energy and sustainable development, bioenergy production is a must. A carboxylate platform-based bioprocess now enables the conversion of organic waste into a valuable bioproduct via open culture fermentation due to a complex microbial activity. Caproic acid is one of the promising products that can be further processed into liquid biofuels. In this study we have shown stable, long-term production of n-caproate from acid whey by shaping the reactor microbiome in a UASB bioreactor. The reactor was operated at pH 5.5 with gradually decreasing hydraulic retention time. The results showed acceleration of n-caproate formation and the highest average n-caproate production rate that lasted for 37 days was 134.3 +/- 30.9 mmolC L-1 d(-1) (0.11 g L-1 h(-1)) (with a median of 146.1 mmolC L-1 d(-1)) and specificity between 58 and 83% (with a median of 79%). Microbiological studies showed the prevalence of fermentative microorganisms from the families Coriobacteriaceae, Ruminococcaceae and Prevotellaceae that are the likely agents for lactose and lactate to n-caproate conversion. A flow cytometry based evaluation of the reactor microbiome demonstrated the inherent heterogeneity of microbial subpopulations in terms of microbial activity at different points of fermentation.
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