期刊
BIORESOURCE TECHNOLOGY
卷 307, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123204
关键词
Anaerobic digestion; Composite accelerants; Biogas yield; Fertilizer utilization; First-principle calculations
资金
- NSFC [51672208]
- National Key RAMP
- D Program of China [2018YFB1502902]
- Key Program for International S AMP
- T Cooperation Projects of Shaanxi Province [2019KWZ-03]
- SciTech RAMP
- D Program of Shaanxi Province [2010K01-120, 2011JM6010, 2015JM5183]
- SRF [(2012)940]
The performance of anaerobic digestion (AD) can be improved by the addition of accelerants. Three types of biomass-derived carbon-based composites (Co/C, CoO/C, and Co3O4/C) were used as accelerants to investigate the effect on AD systems in this work. These accelerants significantly improved the cumulative biogas yield (576585 mL/g VS), and the total chemical oxygen demand degradation rate (68.48-71.11%) compared to the reference group (435.8 mL/g VS, 50.74%). The digestates with accelerants exhibited exceptional stability (59.24-63.67%) and superior fertilizer utilization (3.50-4.55%). In addition, first-principle density functional theory (DFT) calculations were conducted to provide the theoretical basis for the direct interspecies electron transfer (DIET), and a general strategy was proposed to help understand the enhanced methanogenesis pathway induced by the biomass-derived carbon-based composites. These important findings provide a novel avenue for the development of composite accelerants for AD systems.
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