Enrichment of Mesophilic and Thermophilic Mixed Microbial Consortia for Syngas Biomethanation: The Role of Kinetic and Thermodynamic Competition

Abstract

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Potential Utilisation of Dark-Fermented Palm Oil Mill Effluent in Continuous Production of Biomethane by Self-Granulated Mixed Culture

“…In fact, species belonging to Methanothermobacter sp. genus have been reported to be capable of autotrophic growth and were added to AD system to improve the syngas biomethanation process by enhancing the biomass conversion efficiency and the CH 4 content of the evolved gases 61 . Similarly, Methanbrevibacter sp.…”

Recent progress towards in-situ biogas upgrading technologies

“…3D). Some researchers reported that thermophilic conditions presented a higher CH 4 production rate and H 2 bioconversion rate in H 2 addition reactors (Figeac et al, 2020;Grimalt-Alemany et al, 2020;Yun et al, 2017;Zhu et al, 2019b). In BES, Methanobacterium and Methanobrevibacter prevailed (Geppert et al, 2016).…”

Modeling of syngas biomethanation and catabolic route control in mesophilic and thermophilic mixed microbial consortia

“…The enrichment cultures used as inocula in experiments carried out under mesophilic and thermophilic conditions corresponded to two different MMC previously enriched under mesophilic and thermophilic conditions, respectively. Both enriched cultures originated from the same initial mixture of anaerobic sludges and were enriched using a synthetic syngas mixture as the only carbon and electron source as described in Grimalt-Alemany et al [24].…”

“…The calibration (parameter estimation) and validation of the models were performed largely based on a dataset from previous work [24] consisting of one experiment with syngas and 4 specific activity tests with either only CO, H2/CO2 or acetate as the only substrates combined with the methanogenic inhibitor sodium 2bromoethanesulfonate (BES). This dataset was extended with 4 additional experiments, where the initial PH2 was fixed to 1 atm and the initial PCO varied from 0.2 atm to 0.8 atm.…”