Journal article
Novel microbial-electrochemical filter with a computer-feedback pH control strategy for upgrading biogas into biomethane
Bioresource Technology, Vol.332, Art. 125137
2021
Abstract
A novel microbial-electrochemical filter was designed and operated based on a combined microbial electrolysis cell and bio-trickling filter principles with the aim to maximize gas–liquid mass-transfer efficiency and minimize costs associated with bubbling biogas through liquid-filled reactor. CO2/biogas feed to the MEF was done via a computer-feedback pH control strategy, linking CO2 feed directly to the OH− production. As a result current efficiency was constant at around 100% throughout the period of experiments.
CO2 from biogas was almost completely removed at cathodic pH setpoint of 8.5. Maximum CO2 removal rate was 14.6 L/L/day (equivalent to 29.2 L biogas/L/day). Net energy consumption was around 1.28 kWh/Nm3CO2 or 0.64 kWh/m3 biogas (maximum 49% energy efficiency). An ability to maintain a constant pH means elevated pH from increasing applied potential (current) is no longer an issue. The process can potentially be up-scaled and operated at a much higher current and therefore CO2 removal rate.
Details
- Title
- Novel microbial-electrochemical filter with a computer-feedback pH control strategy for upgrading biogas into biomethane
- Authors/Creators
- W. Charles (Author/Creator) - Murdoch UniversityR. Cord-Ruwisch (Author/Creator) - Murdoch UniversityG. Ho (Author/Creator) - Murdoch University
- Publication Details
- Bioresource Technology, Vol.332, Art. 125137
- Publisher
- Elsevier BV
- Identifiers
- 991005544102107891
- Copyright
- © 2021 Elsevier Ltd.
- Murdoch Affiliation
- School of Engineering and Energy
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.83 Bioengineering
- 3.83.1487 Microbial Fuel Cell
- Web Of Science research areas
- Agricultural Engineering
- Biotechnology & Applied Microbiology
- Energy & Fuels
- ESI research areas
- Biology & Biochemistry