Enhancing system stability in power-to-gas applications: integrating biological hydrogen methanation and microbial electrolysis cells under hydrogen overloading in various injection modes.

ABSTRACT: Volatile fatty acid (VFA) accumulation is a common issue that compromises the performance of biological hydrogen methanation systems (BHMs). This accumulation is often triggered by fluctuations in hydrogen supply, which can disrupt microbial activity and lead to system instability. To address this challenge, this study investigated the impact of employing a microbial electrolysis cell (MEC) in BHMs to mitigate system instability and acid build-up. As such, a conventional anaerobic digester (AD) and a microbial electrolysis cell, both supplemented with exogenous hydrogen, were evaluated for their performance in hydrogen methanation. The effect of exogenous hydrogen at high addition rates (> 4:1 CO₂:H₂ molar ratio) under instantaneous and gradual injection modes was inv

SUBMITTER: Bayat A 

PROVIDER: S-EPMC12615864 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature