期刊
BIORESOURCE TECHNOLOGY
卷 336, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125332
关键词
Anaerobic digestion; Bioelectrochemical system; Microbial community; Metabolic functions; Ammonia inhibition
资金
- National Key Research and Development Program of China [2017YFE9133400]
- National Natural Science Foundation of China [51908245]
- Natural Science Foundation of Jiangsu Province [BK20180634]
- Fundamental Research Funds for the Central Universities [JUSRP11941]
- Pre-research Fund of Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment [XTCXSZ2020-3]
The electric field intensity plays a significant role in the effectiveness of bioelectrochemical systems (BES) in alleviating ammonia inhibition, with low voltages improving ammonia removal and methane production, while high voltages leading to a significant decrease in methane production. Hydrogenotrophic methanogens show more resistance to high voltages compared to aceticlastic methanogens, and certain bacteria are vulnerable to external electric field intensity. Abundance changes in metabolic pathways demonstrate that the degradation of carbohydrates, lipids, and proteins in all steps of the anaerobic digestion process can be affected by different applied voltages.
Bioelectrochemical system (BES) is a promising solution for mitigation of ammonia inhibition in anaerobic digestion (AD) process. However, the effect of electric field intensity on microbial community changes and metabolic function prediction during the alleviation of ammonia inhibition are still missing. The results of the current study represented that the improvement of ammonia removal (20.6%) and methane production (14.6%) could both be achieved at 0.2 V while higher voltages led to reductions of methane production (more than 48.9%) compared with the control. Moreover, hydrogenotrophic methanogens (Methanobacterium) seemed to be more robust to high voltages compared with aceticlastic methanogens (Methanosaeta). Additionally, bacteria for hydrolysis and acidogenesis (Rikenellaceae and Soehngenia) were found vulnerable to external electric field intensity. Furthermore, abundances changes of metabolic pathways demonstrated that the degradation of carbohydrates, lipids and proteins during all steps (hydrolysis, acidogenesis, acetogenesis and methanogenesis) of AD process could be affected by different applied voltages.
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