Direct and Indirect Effects of Increased CO₂ Partial Pressure on the Bioenergetics of Syntrophic Propionate and Butyrate Conversion.

ABSTRACT: Simultaneous digestion and in situ biogas upgrading in high-pressure bioreactors will result in elevated CO₂ partial pressure (pCO₂). With the concomitant increase in dissolved CO₂, microbial conversion processes may be affected beyond the impact of increased acidity. Elevated pCO₂ was reported to affect the kinetics and thermodynamics of biochemical conversions because CO₂ is an intermediate and end-product of the digestion process and modifies the carbonate equilibrium. Our results showed that increasing pCO₂ from 0.3 to 8 bar in lab-scale batch reactors decreased the maximum substrate utilization rate (r_smax) for both syntrophic propionate and butyrate oxidation. These kinetic limitations are linked to a

SUBMITTER: Ceron-Chafla P 

PROVIDER: S-EPMC7547868 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature