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: | Smith, Professor Cindy and Ijaz, Dr Umer and Okonkwo, Valentine |
| 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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