11th Acidic Friday

11th Acidic Friday
Date: 21.01.2022 CET 16:00
Venue: Zoom
Location: Online, Zoom

Open discussion platform of the COST action EuroMicropH. This discussion series is intended to stimulate an exchange on the different aspects of how microorganisms react to low pH conditions and why people are interested to investigate this subject. 

Please register here for the upcoming meeting. To access the session, please follow the zoom link below.

21.01.2022 16:00 CET

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Meeting-ID: 957 1485 8274



Matthias Steiger , TU Wien, Austria, Vienna


16:00 Welcome

16:05 Merve ATASOY, M-UNLOCK, The Netherlands

Lighting the effect of pH on volatile fatty acid production

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Lighting the effect of pH on volatile fatty acid production


Volatile fatty acids, intermediate products of anaerobic digestion, are one of the most promising biobased products. In this study, the effects of acidic (pH 5), neutral (without pH adjustment) and alkali (pH 10) pH on production efficiency and composition of volatile fatty acids (VFAs) and bacterial community profile were analyzed. The anaerobic sequencing batch reactors were fed by cheese production wastewater as substrate and inoculated by anaerobic granular seed sludge. The results showed that acidic pH improved VFA production yield (0.92 at pH 5; 0.42 at pH 10 and 0.21 gCOD/gVS at neutral pH). Furthermore, propionic acid was dominant under both pH 10 (average 64±20%) and neutral pH (average 72±8%), whereas, acetic acid (average 23±20%4), propionic acid (average 22±3%), butyric acid (average 21±4%) and valeric acid (average 15±8%) were almost equally distributed under pH 5. Adaptation of bacterial community to different pH conditions might steer the acid profile: Bacteroidetes (50.07±2%) under pH 10, Proteobacteria (40.74±7%) under neutral pH and Firmicutes (47.64±9%) under pH 5 were the most dominant phylum, respectively.

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