期刊
RENEWABLE ENERGY
卷 138, 期 -, 页码 980-986出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2019.02.051
关键词
Trace elements; Anaerobic digestion; Grass silage; Biogas; 16S
资金
- Science Foundation Ireland (SFI) [11/RFP.1/ENM/3213, 12/RC/2302]
- Teagasc through a Walsh Fellowship
- Beaufort Marine Research Award, part of the Sea Change Strategy
- Strategy for Science Technology and Innovation (2006-2012)
- Marine Institute under the Marine Research Sub Programme of the National Development Plan 2007-2013
- Science Foundation Ireland (SFI) [11/RFP.1/ENM/3213] Funding Source: Science Foundation Ireland (SFI)
Trace elements (TE) are known to play a crucial role in microbial metabolism, and to improve biogas output in anaerobic digestion (AD), although the mechanisms are not well characterised. We have characterised the microbial communities associated with anaerobic mono-digestion of grass silage through initiation, stable operation, inhibition at high organic loading rates, and rescue through addition of trace elements (iron, nickel and cobalt). Comparison of these communities with communities from unsupplemented anaerobic co-digestion of a grass silage:slurry mix shows TE supplementation to be significantly associated with increases in genera known to be involved in the metabolism of volatile fatty acids (Gelria, Anaerovorax, Dethiobacter), hydrolysis (Clostridia), and in particular the uncharac-terised clostridial order MBA03. However, a decrease was seen in the abundance of methanogenic Archaea, indicating TE supplementation improves mono-digestion of grass silage through augmented fermentation rather than improved methanogenesis. (C) 2019 Elsevier Ltd. All rights reserved.
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