Journal
BIORESOURCE TECHNOLOGY
Volume 239, Issue -, Pages 345-352Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.05.017
Keywords
Graphene; Activated charcoal; Ethanol; Direct interspecies electron transfer; Anaerobic digestion
Funding
- National key research and development program-China [2016YFE0117900]
- National Natural Science Foundation-China [51676171]
- Zhejiang Provincial Key Research and Development Program-China [2017C04001]
- Science Foundation Ireland (SFI) through the Centre for Marine and Renewable Energy (MaREI) [12/RC/2302]
- Gas Networks Ireland (GNI) through the Gas Innovation Group
- ERVIA
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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. (C) 2017 Elsevier Ltd. All rights reserved.
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