Removal and recovery of inhibitory volatile fatty acids from mixed acid fermentations by conventional electrodialysis

Hydrogen production during dark fermentation is inhibited by the co-production of volatile fatty acids (VFAs) such as acetic and n-butyric acid. In this study, the effectiveness of conventional electrodialysis (CED) in reducing VFA concentrations in model solutions and hydrogen fermentation broths i...

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Bibliographic Details
Published in:Bioresource technology 2015-08, Vol.189, p.279-284
Main Authors: Jones, Rhys Jon, Massanet-Nicolau, Jaime, Guwy, Alan, Premier, Giuliano C, Dinsdale, Richard M, Reilly, Matthew
Format: Article
Language:English
Subjects:
Acetic Acid - metabolism
Batch Cell Culture Techniques
Bioreactors
Butyric Acid - metabolism
Carboxylic Acids - metabolism
Dialysis - methods
Electricity
Fatty Acids, Volatile - isolation & purification
Fermentation - drug effects
Hydrogen - metabolism
Hydrogen-Ion Concentration
Poaceae - chemistry
Solutions
Sucrose - pharmacology
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Summary:Hydrogen production during dark fermentation is inhibited by the co-production of volatile fatty acids (VFAs) such as acetic and n-butyric acid. In this study, the effectiveness of conventional electrodialysis (CED) in reducing VFA concentrations in model solutions and hydrogen fermentation broths is evaluated. This is the first time CED has been reported to remove VFAs from hydrogen fermentation broths. During 60 min of operation CED removed up to 99% of VFAs from model solutions, sucrose-fed and grass-fed hydrogen fermentation broths, containing up to 1200 mg l(-1) each of acetic acid, propionic acid, i-butyric acid, n-butyric acid, i-valeric acid, and n-valeric acid. CED's ability to remove VFAs from hydrogen fermentation broths suggests that this technology is capable of improving hydrogen yields from dark fermentation.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2015.04.001