期刊
BIORESOURCE TECHNOLOGY
卷 345, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126492
关键词
Anaerobic digestion; Conductive granular sludge; Direct interspecies electron transfer; Magnetite; Microbial community structure; Upflow anaerobic sludge blanket reactor
资金
- National Research Foundation of Korea [2020R1A2C2004368]
- Korea Institute of Energy Technology Evaluation and Planning through Human Resources Program in Energy Technology [20184030202250]
- National Research Foundation of Korea [2020R1A2C2004368] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study demonstrates the formation of conductive magnetite-embedded granular sludge and its positive impact on the performance of anaerobic sludge blanket reactors treating dairy wastewater. The magnetite-supplemented reactor showed better performance, with improved sludge settling and electron transport activity, as well as higher abundance of electroactive microbes. This study offers a new approach to enhance anaerobic granular sludge systems.
Promoting direct interspecies electron transfer (DIET) with conductive additives has proved effective in improving anaerobic digestion performance and stability. However, its application is limited by the need to replenish the washout loss of conductive materials. This study reports the formation of conductive magnetite-embedded granular sludge and its long-term influence on the performance of upflow anaerobic sludge blanket reactors treating dairy wastewater. The magnetite-supplemented reactor maintained better performance than the no-magnetite control, with greater sludge settling and electron transport activity, throughout the 192-d experiment at increasing organic loading rates (1.2-8.5 g chemical oxygen demand/L.d). The abundance of electroactive microbes also remained higher in the magnetite-supplemented reactor. The results suggest that DIETbased electric syntrophy was promoted in the magnetite-embedded granules. This study is the first to demonstrate the self-embedment of submicron conductive material into granular sludge and its benefits. These findings offer a new approach to enhancing anaerobic granular sludge systems.
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