Volatile fatty acids production via mixed culture fermentation: Revealing the link between pH, inoculum type and bacterial composition

Bioresource Technology
Merve AtasoyZeynep Cetecioglu

Abstract

The aim of the study was to investigate the effects of operational parameters, inoculum type and bacterial community on mixed culture fermentation to produce one dominant acid type in the mixture of volatile fatty acids (VFA). The study was performed using three different inocula (large&small granular and slurry) with glucose under various initial pH. The VFA production efficiency reached to 0,97 (gCOD/gSCOD) by granular sludge. VFA composition was changed by initial pH: in neutral conditions, acetic acid; in acidic conditions, acetic and butyric acids, in alkali conditions butyric acid were dominated, respectively. The VFA production was positively affected by the high relative abundance of Firmicutes. On the contrary, a negative correlation was seen between VFA production and the relative abundance of Chloroflexi. The results revealed the physical sludge structure of inoculum was the key factor for production efficiency, whereas, pH was the most important parameter to affect VFA composition.

Citations

Dec 18, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jose Antonio MagdalenaCristina González-Fernández
Dec 2, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Unnikrishnan JayakrishnanGopal Das
May 22, 2020·The Science of the Total Environment·Andrea Fra-VázquezAnuska Mosquera-Corral
Jan 14, 2021·Biotechnology and Bioengineering·Robert D HoelzleDamien Batstone
Jan 11, 2021·Bioresource Technology·Jorge L RicoSusan K De Long
Aug 18, 2020·Journal of Environmental Management·Jose Antonio MagdalenaCristina González-Fernández
May 4, 2021·Applied Biochemistry and Biotechnology·Alaa SalmaHayet Djelal
Jun 25, 2021·Journal of Environmental Management·Merve Atasoy, Zeynep Cetecioglu
Jul 2, 2021·Journal of Environmental Management·A F R SilvaM C S Amaral

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