open access publication

Article, 2024

Spatial monitoring of hydrolysis in a plug-flow bioreactor: a support for flexible operation?

Bioresources and Bioprocessing, ISSN 2197-4365, Volume 11, 1, Page 23, 10.1186/s40643-024-00740-0

Contributors

Menzel, Theresa 0000-0003-3044-9784 [1] Neubauer, Peter 0000-0002-1214-9713 [1] Junne, Stefan G 0000-0001-6185-2627 (Corresponding author) [1] [2]

Affiliations

  1. [1] Technical University of Berlin
    2. [NORA names: Germany; Europe, EU; OECD];
  2. [2] Aalborg University
    3. [NORA names: AAU Aalborg University; University; Denmark; Europe, EU; Nordic; OECD]

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

Keywords

acid, acid concentration, acid yield, acidification, acidogenesis, acidogenic fermentation, automation, bioaugmentation, bioreactor, changes, concentration, conductivity, content, control, correlation, dynamic operation, feeding, feedstock, fermentation, flexible operation, formation, gradient, gradient formation, hydraulic retention time, hydrolysis, impact, information, liquid phase, measurement spot, monitoring, operation, oxidation-reduction potential, pH, pH values, performance, phase, plug flow reactor, plug-flow bioreactor, potential, potential correlation, process performance, reactor, recalcitrant feedstocks, recirculation, retention time, spatial monitoring, spots, straw content, study, study potential correlations, time, weeks, yield

Data Provider: Digital Science

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