Skip to main content

Research Repository

Advanced Search

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

Davide Poggio

Arman Sastraatmaja

Profile image of Mark Walker

Dr Mark Walker Mark.Walker@hull.ac.uk
Lecturer in Sustainable Engineering Systems

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

Files

Published article (6.2 Mb)
PDF

Publisher Licence URL
http://creativecommons.org/licenses/by/4.0

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/).




You might also like



Downloadable Citations