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Conductive iron oxides accelerate thermophilic methanogenesis from acetate and propionate

Paper ID Volume ID Publish Year Pages File Format Full-Text
20331 43169 2015 5 PDF Available
Title
Conductive iron oxides accelerate thermophilic methanogenesis from acetate and propionate
Abstract

•The effects of iron oxides on thermophilic methanogenesis were examined.•Conductive iron oxides facilitated methanogenic degradation of acetate and propionate.•The bacterial population was greatly affected by conductive iron oxides.•Promotion of interspecies electron transfer is the plausible mechanism.

Anaerobic digester is one of the attractive technologies for treatment of organic wastes and wastewater, while continuous development and improvements on their stable operation with efficient organic removal are required. Particles of conductive iron oxides (e.g., magnetite) are known to facilitate microbial interspecies electron transfer (termed as electric syntrophy). Electric syntrophy has been reported to enhance methanogenic degradation of organic acids by mesophilic communities in soil and anaerobic digester. Here we investigated the effects of supplementation of conductive iron oxides (magnetite) on thermophilic methanogenic microbial communities derived from a thermophilic anaerobic digester. Supplementation of magnetite accelerated methanogenesis from acetate and propionate under thermophilic conditions, while supplementation of ferrihydrite also accelerated methanogenesis from propionate. Microbial community analysis revealed that supplementation of magnetite drastically changed bacterial populations in the methanogenic acetate-degrading cultures, in which Tepidoanaerobacter sp. and Coprothermobacter sp. dominated. These results suggest that supplementation of magnetite induce electric syntrophy between organic acid-oxidizing bacteria and methanogenic archaea and accelerate methanogenesis even under thermophilic conditions. Findings from this study would provide a possibility for the achievement of stably operating thermophilic anaerobic digestion systems with high efficiency for removal of organics and generation of CH4.

Keywords
Thermophilic methane fermentation; Thermophilic anaerobic digestion; Methanogenic degradation; Methane production; Degradation of organic acid; Magnetite; Conductive iron oxides; Syntrophic relationship; CH4
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Conductive iron oxides accelerate thermophilic methanogenesis from acetate and propionate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 119, Issue 6, June 2015, Pages 678–682
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us