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Abstract
Hydrolysis at changing hydraulic retention time, recirculation, bedding straw content in the feed, bioaugmentation and the impact of those changes on gradient formation in the liquid phase in plug-flow reactors (PFRs) was examined. The pH-value, conductivity and oxidation–reduction potential (ORP) were monitored at three spots along the PFRs to study potential correlations to process performance during a total process time of 123 weeks. The on-line monitoring showed good correlations to acidogenesis: namely, the pH and ORP to the acidification, to butyric (and lactic) acid concentration and to the acid yield. The ORP (measured at the inlet) showed the most stable correlation to acidogenesis under dynamic operation, while the conductivity (at the outlet) correlated to the acid concentration in dependence on the feedstock. Multiple measurement spots as used in this study allow to gain more information about acidogenic fermentation than a single spot, simplifying process control and automation attempts with recalcitrant feedstock. Graphical Abstract: (Figure presented.)
Original language | English |
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Article number | 23 |
Journal | Bioresources and Bioprocessing |
Volume | 11 |
Issue number | 1 |
ISSN | 2197-4365 |
DOIs | |
Publication status | Published - 14 Feb 2024 |
Bibliographical note
© 2024. The Author(s).Keywords
- Anaerobic Digestion
- Process analytical technologies
- Straw
- recalcitrant feedstock
- Multiposition monitoring
- Bedding straw
- Hydraulic retention time
- Anaerobic digestion
- Thin-sludge recirculation
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Dive into the research topics of 'Spatial monitoring of hydrolysis in a plug-flow bioreactor: a support for flexible operation?'. Together they form a unique fingerprint.Projects
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Plug-flow based dark fermentation for short-chain carboxylic acid accumulation from biogenic residues
16/10/2022 → …
Project: Research