Probing the robustness of Geobacter sulfurreducens against fermentation hydrolysate for uses in bioelectrochemical systems

Publikationstyp
Journal Article
Date Issued
2023-02
Sprache
English
Author(s)
Härrer, Daniel  
Elreedy, Ahmed  
Ali, Rowayda  
Hille-Reichel, Andrea  
Gescher, Johannes 
Institut
Technische Mikrobiologie V-7  
TORE-URI
http://hdl.handle.net/11420/14495
Journal
Bioresource technology  
Volume
369
Article Number
128363
Citation
Bioresource Technology 369: 128363 (2023-02)
Publisher DOI
10.1016/j.biortech.2022.128363
Scopus ID
2-s2.0-85142700949
PubMed ID
36423764
In this study, impacts of toxic ions/acids found in real fermentation-hydrolysate on the model exoelectrogenic G. sulfurreducens were investigated. Initially, different concentrations of acetate, butyrate, propionate, Na+, and K+ were tested, individually and in combination, for effects on the planktonic growth, followed by validation with diluted-hydrolysate. Meanwhile, it could be shown that (1) excess Na+ (≥100 mM) causes inhibition that can be reduced by K+ replacement, (2) butyrate (≥10 mM) induces higher toxicity than propionate, and (3) hydrolysate induces synergistic inhibition to G. sulfurreducens where organic constituents contributed more than Na+. Afterwards, compared with impacts on planktonic cells, the pre-enriched anodic biofilm of G. sulfurreducens in BESs showed higher robustness against diluted-hydrolysate, achieving current densities of 1.4–1.7 A/m2 (at up to ∼30 mM butyrate and propionate as well as ∼240 mM Na+). As a conclusion, using G. sulfurreducens in BESs dealing with fermentation-hydrolysate can be regulated for efficacious energy recovery.
Subjects
Anodic biofilm
Current density
Cylindrical and flat-plate reactors
Ions/acids toxicity
Planktonic growth