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Volatile fatty acids production via mixed culture fermentation: Revealing the link between pH, inoculum type and bacterial composition
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Resource recovery.ORCID iD: 0000-0003-4046-1592
Queen Mary Univ London, Sch Biol & Chem Sci, London E1 4NS, England..
Swedish Univ Agr Sci, Dept Mol Sci, Bioctr, SE-75007 Uppsala, Sweden..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Resource recovery.ORCID iD: 0000-0002-8170-379x
2019 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 292, article id 121889Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2019. Vol. 292, article id 121889
Keywords [en]
Volatile fatty acids, pH, Sludge structure, Bacterial community, Mixed culture fermentation
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-260984DOI: 10.1016/j.biortech.2019.121889ISI: 000485045400092PubMedID: 31394468Scopus ID: 2-s2.0-85071995984OAI: oai:DiVA.org:kth-260984DiVA, id: diva2:1357879
Note

QC 20191004

Available from: 2019-10-04 Created: 2019-10-04 Last updated: 2019-10-16Bibliographically approved

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Atasoy, MerveCetecioglu, Zeynep

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