Enrichment of specific electro-active microorganisms and enhancement of methane production by adding granular activated carbon in anaerobic reactors

Bioresource Technology
Jung-Yeol LeeHee-Deung Park

Abstract

Direct interspecies electron transfer (DIET) via conductive materials can provide significant benefits to anaerobic methane formation in terms of production amount and rate. Although granular activated carbon (GAC) demonstrated its applicability in facilitating DIET in methanogenesis, DIET in continuous flow anaerobic reactors has not been verified. Here, evidences of DIET via GAC were explored. The reactor supplemented with GAC showed 1.8-fold higher methane production rate than that without GAC (35.7 versus 20.1±7.1mL-CH4/d). Around 34% of methane formation was attributed to the biomass attached to GAC. Pyrosequencing of 16S rRNA gene demonstrated the enrichment of exoelectrogens (e.g. Geobacter) and hydrogenotrophic methanogens (e.g. Methanospirillum and Methanolinea) from the biomass attached to GAC. Furthermore, anodic and cathodic currents generation was observed in an electrochemical cell containing GAC biomass. Taken together, GAC supplementation created an environment for enriching the microorganisms involved in DIET, which increased the methane production rate.

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Citations

Apr 21, 2017·International Journal of Molecular Sciences·Ramiro Blasco-GómezSebastià Puig
Jul 12, 2017·Microbial Biotechnology·Roman MoscovizNicolas Bernet
Apr 28, 2017·Environmental Microbiology·Andreia F SalvadorM Madalena Alves
Aug 23, 2019·Microbial Ecology·Yihua SunMeng Li
Feb 6, 2020·Frontiers in Microbiology·Kensuke IgarashiSouichiro Kato
May 10, 2017·The Journal of General and Applied Microbiology·Yuko Goto, Naoko Yoshida
Jul 13, 2017·Annual Review of Microbiology·Derek R Lovley
Dec 10, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Josue KassongoAndrew S Ball
Nov 17, 2019·Bioresource Technology·Wangwang YanYan Zhou
Mar 21, 2021·Bioresource Technology·Wei Wang, Duu-Jong Lee
Mar 29, 2021·The Science of the Total Environment·Najiaowa YuYang Liu

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