Davide Poggio
Experimental Evaluation of Continuous In-Situ Biomethanation of CO2 in Anaerobic Digesters Fed on Sewage Sludge and Food Waste and the Influence of Hydrogen Gas–Liquid Mass Transfer
Poggio, Davide; Sastraatmaja, Arman; Walker, Mark; Michailos, Stavros; Nimmo, William; Pourkashanian, Mohamed
Authors
Arman Sastraatmaja
Dr Mark Walker Mark.Walker@hull.ac.uk
Lecturer in Sustainable Engineering Systems
Dr Stavros Michailos S.Michailos@hull.ac.uk
Lecturer in Chemical Engineering
William Nimmo
Mohamed Pourkashanian
Abstract
In-situ biomethanation combines conventional biogas production from the anaerobic digestion (AD) of organic matter with the addition of hydrogen to produce a higher quality biomethane gas. However, challenges surrounding its performance and control could hinder its uptake. To investigate this, an automated rig was designed and operated to study in-situ biomethanation with sewage sludge (SS) and food waste (FW) feedstocks. The effects that were experimentally investigated included the biogas recirculation rate, stirring intensity, and organic loading rate (OLR). All the results highlighted the rate-limiting effect of H2 gas–liquid mass transfer (measured kLa in the range of 43–82 day−1), which was implied by a lack of evidence of hydrogen-induced biological inhibition and a high average equilibrium hydrogen content in the biogas (a volume of 7–37%). At an OLR of 2 g VS L−1day−1, increasing biogas recirculation and mechanical stirring rates improved the methane evolution rate up to 0.17 and 0.23 L L−1day−1 and the H2 conversion up to 80 and 66% for sewage sludge and food waste, respectively. A lower OLR of 1 g VS L−1day−1 allowed for increased hydrogen conversion but at a lower level of methane productivity. A process model, validated on experimental data, predicted that improving the kLa to at least 240 day−1 would be required for in-situ biomethanation at OLRs common in AD systems in order to achieve a drop-in quality in terms of the biogas, with further downstream treatment required for certain applications.
Citation
Poggio, D., Sastraatmaja, A., Walker, M., Michailos, S., Nimmo, W., & Pourkashanian, M. (2023). Experimental Evaluation of Continuous In-Situ Biomethanation of CO2 in Anaerobic Digesters Fed on Sewage Sludge and Food Waste and the Influence of Hydrogen Gas–Liquid Mass Transfer. Processes, 11(2), Article 604. https://doi.org/10.3390/pr11020604
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 13, 2023 |
Online Publication Date | Feb 16, 2023 |
Publication Date | 2023-02 |
Deposit Date | Apr 4, 2023 |
Publicly Available Date | Apr 6, 2023 |
Journal | Processes |
Electronic ISSN | 2227-9717 |
Publisher | MDPI |
Peer Reviewed | Peer Reviewed |
Volume | 11 |
Issue | 2 |
Article Number | 604 |
DOI | https://doi.org/10.3390/pr11020604 |
Keywords | Biomethanation; In-situ; Biogas upgrading; Hydrogen; Gas–liquid mass transfer |
Public URL | https://hull-repository.worktribe.com/output/4255413 |
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Copyright Statement
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
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