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Biomethane Enhancement Through Electromethanogenesis: A Study of Alternating Potentials Strategy
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Thesis/Dissertation
Date
2025-05
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Environmental Engineering
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DOI
https://doi.org/10.34944/k6xm-nr28
Abstract
The rising demand of renewable biofuel has been reported with an increase of 5,700million liters from 2022 to 2024. The high demand is mainly due to multiple factors such as unstable manufacturing of fossil fuel refinery and renewable act on global warming. Converting waste streams into biofuel could be a key to unlock energy transition from fossil fuel to renewable energy. Conventional production of biomethane in renewable biofuel rely on anaerobic digestion process which has an average conversion rate of 60%. Some anaerobic digestion processes might have a lower production rate of biomethane due to temperature changes, operation malfunction, high acidity, and unhealthy microbial community. Recent discovery of electromethanogenesis during biomethane production process using electrode-assisted strategy to upgrade methane production attracts many attentions. However, the main issue with this strategy led to a single-sided development of microbial community under electrode simulation and selection. Withdrawing the electrode after the selection pressure might release the driving force and lead to a degradation of electrotrophic methanogens population. Alternating potentials, as an alternative strategy implement both positive and negative potentials in a certain period of application can avoid the issue and deliver a more reliable microbial community in a long-term. Therefore, this research is intended to study the behavior of electrotrophic methanogens and co-selected microbial community under the selection strategy of alternating potentials. The study includes experiments of the application of alternating potentials, the application of
removing alternating potentials, and the re-application of alternating potentials afterwards. This research will increase the knowledge of the effects of electrode application in electromethanogenesis and biomethane production.
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