期刊
BIORESOURCE TECHNOLOGY
卷 297, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.122443
关键词
Anaerobic digestion; Direct interspecies electron transfer; Electromethanogenesis; External voltage; Magnetite; Microbial community structure
资金
- National Research Foundation of Korea (NRF) - Ministry of Education, Republic of Korea [2017R1D1A1B03035489]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) through Human Resources Program in Energy Technology - Ministry of Trade, Industry and Energy, Republic of Korea [20164030201010, 20184030202250]
- National Research Foundation of Korea [2017R1D1A1B03035489] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Direct interspecies electron transfer (DIET) between exoelectrogenic fatty acid oxidizers and electrotrophic methanogens plays an important role in keeping the overall anaerobic digestion (AD) process well-balanced. This study examined the individual and combined effects of two different DIET-promoting strategies, i.e., magnetite addition (20 mM Fe) and external voltage application (0.6 V), in continuous digesters treating dairy wastewater. Although the strategies were both effective in enhancing the process performance and stability, adding magnetite had a much greater stimulatory effect. External voltage contributed little to the methane yield, and the digester with magnetite addition alone achieved stable performance, comparable to that of the digester where both strategies were combined, at short hydraulic retention times (down to 7.5 days). Diverse (putative) electroactive microorganisms were significantly enriched under DIET-promoting conditions, particularly with magnetite addition. The overall results suggest that magnetite addition could effectively enhance AD performance and stability by promoting DIET-based electro-syntrophic microbial interactions.
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