Enrichment of the hydrogenotrophic methanogens for, in-situ biogas up-gradation by recirculation of gases and supply of hydrogen in methanogenic reactor

Khan, A., Akbar, S., Okonkwo, V., Smith, C. , Khan, S., Shah, A. A., Adnan, F., Ijaz, U. Z. , Ahmed, S. and Badshah, M. (2022) Enrichment of the hydrogenotrophic methanogens for, in-situ biogas up-gradation by recirculation of gases and supply of hydrogen in methanogenic reactor. Bioresource Technology, 345, 126219. (doi: 10.1016/j.biortech.2021.126219) (PMID:34813923)

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Abstract

During in situ biogas up-gradation by supplying hydrogen from an external source and enrichment of hydrogenotrophic methanogens, high pressure of H negatively affects hydrolytic and fermentative activities. To overcome this problem, the present study aimed to enrich the hydrogenotrophic methanogens by optimization of various parameters associated with gas recirculation along-with hydrogen supply from the external source. Due to recirculation of gases and supplied hydrogen, methane generation was two-fold higher in the optimal condition than in conventional anaerobic digestion, with the highest methane content of 99%. Additionally, the hydrogenotrophic methanogens were enriched, with a decrease in acetoclastic methanogens and an increase in Bathyarchaeia population, which utilizes H and CO to produce acetate and lactate as end products. The study concludes that recirculation increases methane production by converting H and CO into methane and enhances the degradation of organic matter left over undigested in the hydrolytic reactor.

Item Type:Articles
Additional Information:This study is part of NRPU project (6194/Federal/NRPU/R&D/HEC/2016). The financial support to accomplish this research by the Higher Education Commission of Pakistan and Quaid-i-Azam University, Islamabad, is greatly acknowledged. UZI was supported by the NERC Independent Research Fellowship (NE/L011956/1).
Keywords:Biogas up-gradation, in situupgrading, anaerobic digestion, methane content, hydrogenotrophic methanogens.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Okonkwo, Valentine and Smith, Professor Cindy and Ijaz, Dr Umer
Authors: Khan, A., Akbar, S., Okonkwo, V., Smith, C., Khan, S., Shah, A. A., Adnan, F., Ijaz, U. Z., Ahmed, S., and Badshah, M.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Bioresource Technology
Publisher:Elsevier
ISSN:0960-8524
ISSN (Online):1873-2976
Published Online:20 November 2021
Copyright Holders:Copyright © 2021 Elsevier Ltd.
First Published:First published in Bioresource Technology 345: 126219
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
170256Understanding microbial community through in situ environmental 'omic data synthesisUmer Zeeshan IjazNatural Environment Research Council (NERC)NE/L011956/1ENG - Infrastructure & Environment