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Novel microbial-electrochemical filter with a computer-feedback pH control strategy for upgrading biogas into biomethane

Charles, W., Cord-Ruwisch, R. and Ho, G.ORCID: 0000-0001-9190-8812 (2021) Novel microbial-electrochemical filter with a computer-feedback pH control strategy for upgrading biogas into biomethane. Bioresource Technology, 332 . Art. 125137.

Link to Published Version: https://doi.org/10.1016/j.biortech.2021.125137
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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.

Item Type: Journal Article
Murdoch Affiliation(s): Engineering and Energy
Publisher: Elsevier BV
Copyright: © 2021 Elsevier Ltd.
URI: http://researchrepository.murdoch.edu.au/id/eprint/60428
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