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Kim, Jaai
School of Urban and Environmental Engineering
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A long-term study on the effect of magnetite supplementation in continuous anaerobic digestion of dairy effluent - magnetic separation and recycling of magnetite

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Title
A long-term study on the effect of magnetite supplementation in continuous anaerobic digestion of dairy effluent - magnetic separation and recycling of magnetite
Author
Baek GahyunJung, HeehungKim, JaaiLee, Changsoo
Keywords
Anaerobic digestion; Direct interspecies electron transfer; Magnetite recycling; Methanogenesis; Microbial community structure
Issue Date
201710
Publisher
ELSEVIER SCI LTD
Citation
BIORESOURCE TECHNOLOGY, v.241, no., pp.830 - 840
Abstract
Promotion of direct interspecies electron transfer (DIET) between exoelectrogenic bacteria and electron-utilizing methanogens has recently been discussed as a new method for enhanced biomethanation. This study evaluated the effect of magnetite-promoted DIET in continuous anaerobic digestion of dairy effluent and tested the magnetic separation and recycling of magnetite to avoid continuous magnetite addition. The applied magnetite recycling method effectively supported enhanced DIET activity and biomethanation performance over a long period (>250 days) without adding extra magnetite. DIET via magnetite particles as electrical conduits was likely the main mechanism for the enhanced biomethanation. Magnetite formed complex aggregate structures with microbes, and magnetite recycling also helped retain more biomass in the process. Methanosaeta was likely the major methanogen group responsible for DIET-based methanogenesis, in association with Proteobacteria and Chloroflexi populations as syntrophic partners. The recycling approach proved robust and effective, highlighting the potential of magnetite recycling for high-rate biomethanation.
URI
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DOI
http://dx.doi.org/10.1016/j.biortech.2017.06.018
ISSN
0960-8524
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