A long-term study on the effect of magnetite supplementation in continuous anaerobic digestion of dairy effluent - Magnetic separation and recycling of magnetite.

Citation data:

Bioresource technology, ISSN: 1873-2976, Vol: 241, Page: 830-840

Publication Year:
2017
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/22210
PMID:
28628987
DOI:
10.1016/j.biortech.2017.06.018
Author(s):
Baek, Gahyun, Jung, Heejung, Kim, Jaai, Lee, Changsoo
Publisher(s):
ELSEVIER SCI LTD
Tags:
Anaerobic digestion, Direct interspecies electron transfer, Magnetite recycling, Methanogenesis, Microbial community structure
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article description
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 (>250days) 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.