| Autor: |
Duber, Anna, Jaroszynski, Lukasz, Zagrodnik, Roman, Chwialkowska, Joanna, Juzwa, Wojciech, Ciesielski, Slawomir, Oleskowicz-Popiel, Piotr |
| Předmět: |
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| Zdroj: |
Green Chemistry; 8/21/2018, Vol. 20 Issue 16, p3790-3803, 14p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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