Enhancement of anaerobic methanogenesis at a short hydraulic retention time via bioelectrochemical enrichment of hydrogenotrophic methanogens

[Display omitted] •Electric-biological reactor achieved high-efficiency organic removal at a short HRT.•CH4 production in this electric-biological reactor was significantly improved.•Hydrogenotrophic methanogens was largely enriched in electric-biological reactor.•Additional electric input was only...

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Bibliographic Details
Published in:Bioresource technology 2016-10, Vol.218, p.505-511
Main Authors: Li, Yang, Zhang, Yaobin, Liu, Yiwen, Zhao, Zhiqiang, Zhao, Zisheng, Liu, Sitong, Zhao, Huimin, Quan, Xie
Format: Article
Language:English
Subjects:
Anaerobic digestion
Anaerobiosis
Bioelectrochemical system
Biofilms
Biological Oxygen Demand Analysis
Bioreactors
Cluster Analysis
DNA, Ribosomal - analysis
Electrochemistry - methods
Electrodes
Euryarchaeota - metabolism
Hydrogen - chemistry
Hydrogen-Ion Concentration
Hydrogenotrophic methanogens
Methane - chemistry
Sequence Analysis, DNA
Sewage - chemistry
Short HRT
Waste Water
Water Purification - methods
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Summary:[Display omitted] •Electric-biological reactor achieved high-efficiency organic removal at a short HRT.•CH4 production in this electric-biological reactor was significantly improved.•Hydrogenotrophic methanogens was largely enriched in electric-biological reactor.•Additional electric input was only 25.6% of energy income from increased CH4. Anaerobic digestion (AD) is an important energy strategy for converting organic waste to CH4. A major factor limiting the practical applicability of AD is the relatively long hydraulic retention time (HRT) which declines the treatment efficiency of digesters. A coupling process of anaerobic digestion and ‘electromethanogenesis’ was proposed to enhance anaerobic digestion at a short HRT in this study. Microorganisms analysis indicated that the electric-biological reactor enriched hydrogenotrophic methanogens in both cathodic biofilm and suspended sludge, helping achieve the high organic removal (71.0% vs 42.3% [control reactor]) and CH4 production (248.5mL/h vs 51.3mL/h), while the additional electric input was only accounted for 25.6% of the energy income from the increased CH4 production. This study demonstrated that a bioelectrochemical enhanced anaerobic reactor could improve the CH4 production and organic removal at a short HRT, providing an economically feasible scheme to treat wastewater.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.06.112