Access to this article is restricted until 24 months after publication at the request of the publisher. Restriction lift date: 2019-05-05
Boosting biomethane yield and production rate with graphene: the potential of direct interspecies electron transfer in anaerobic digestion
Loading...
Files
Accepted version
Date
2017-05-05
Authors
Lin, Richen
Cheng, Jun
Zhang, Jiabei
Zhou, Junhu
Cen, Kefa
Murphy, Jerry D.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Published Version
Abstract
Interspecies electron transfer between bacteria and archaea plays a vital role in enhancing energy efficiency of anaerobic digestion (AD). Conductive carbon materials (i.e. graphene nanomaterial and activated charcoal) were assessed to enhance AD of ethanol (a key intermediate product after acidogenesis of algae). The addition of graphene (1.0 g/L) resulted in the highest biomethane yield (695.0 ± 9.1 mL/g) and production rate (95.7 ± 7.6 mL/g/d), corresponding to an enhancement of 25.0% in biomethane yield and 19.5% in production rate. The ethanol degradation constant was accordingly improved by 29.1% in the presence of graphene. Microbial analyses revealed that electrogenic bacteria of Geobacter and Pseudomonas along with archaea Methanobacterium and Methanospirillum might participate in direct interspecies electron transfer (DIET). Theoretical calculations provided evidence that graphene-based DIET can sustained a much higher electron transfer flux than conventional hydrogen transfer.
Description
Keywords
Graphene , Activated charcoal , Ethanol , Direct interspecies electron transfer , Anaerobic digestion
Citation
Lin, R., Cheng, J., Zhang, J., Zhou, J., Cen, K. and Murphy, J. D. (2017) 'Boosting biomethane yield and production rate with graphene: The potential of direct interspecies electron transfer in anaerobic digestion', Bioresource Technology, 239, pp. 345-352. doi:10.1016/j.biortech.2017.05.017