Fachgebiet 14: Umweltverfahrenstechnik
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Item type:Publication, Effect of cathode properties on the thermophilic electrosynthesis of PolyHydroxyAlkanoates by Kyrpidia spormannii(Elsevier Science, 2022-06); ; ; ; The recent discovery of the Knallgas bacterium Kyrpidia spormannii EA-1, able to produce PolyHydroxyAlkanoates (PHAs) on a cathode, is of great interest to produce bioplastics from electricity and CO2 waste streams. However, little is known on how to improve its electroautotrophic growth and performance in PHA production. We investigated the effect of cathode properties on biofilm formation and PHA synthesis, focusing on the choice of cathode material, the surface modification of a graphite cathode with different treatments or by electrodeposition of metal catalysts, and the distance between anode and cathode. The results show higher performance of iron-based electrodes, isopropanol and sonication treatment, and close distance between electrodes, with up to a 3-fold increase of PHA production, reaching a production of 117 mg·day−1·m−2, and a 10-fold increase in cell density of the biofilm (10.7 Log10 cells·cm−2).journal articleBand:1886 127 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Optimization of growth and electrosynthesis of PolyHydroxyAlkanoates by the thermophilic bacterium Kyrpidia spormanniiThe recent discovery of the Knallgas bacterium Kyrpidia spormannii EA-1, able to produce PolyHydroxyAlkanoates (PHA) on a cathode, is of great interest to sustainably produce bioplastics from electricity and CO2. In this study, we investigated the effect of cathode properties on PHA synthesis, focusing on the choice of cathode material, the surface modification of a graphite cathode with different treatments or by electrodeposition of metal catalysts, and the distance between anode and cathode. The results show a particular high performance of iron-based electrodes with increased biofilm density and PHA production. Also, a simple treatment of the graphite cathode with isopropanol and sonication showed the best performance compared to more elaborate surface modifications treatments. Finally, the shorter the distance between anode and cathode was, the better the PHA production was obtained. These optimizations allow to increase by 5-fold the PHA production compared to initial conditions, reaching a production of 117 mg·day−1·m−2.journal articleBand:1793 133