TY - JOUR
T1 - Biogas upgrading with hydrogenotrophic methanogenic biofilms
AU - Maegaard, Karen
AU - Garcia-Robledo, Emilio
AU - Kofoed, Michael V.W.
AU - Agneessens, Laura M.
AU - de Jonge, Nadieh
AU - Nielsen, Jeppe L.
AU - Ottosen, Lars D.M.
AU - Nielsen, Lars Peter
AU - Revsbech, Niels Peter
PY - 2019/9/1
Y1 - 2019/9/1
N2 -
Hydrogen produced from periodic excess of electrical energy may be added to biogas reactors where it is converted to CH
4
that can be utilized in the existing energy grid. The major challenge with this technology is gas-to-liquid mass transfer limitation. The microbial conversions in reactors designed for hydrogenotrophic methanogenesis were studied with microsensors for H
2
, pH, and CO
2
. The H
2
consumption potential was dependent on the CO
2
concentration, but could partially recover after CO
2
depletion. Reactors with 3-dimensional biofilm carrier material and a large gas headspace allowed for a methanogenic biofilm in direct contact with the gas phase. A high density of Methanoculleus sp. in the biofilm mediated a high rate of CH
4
production, and it was calculated that a reactor filled with 75% carrier material could mediate a biogas upgrading from 50 to 95% CH
4
within 24 h when an equivalent amount of H
2
was added.
AB -
Hydrogen produced from periodic excess of electrical energy may be added to biogas reactors where it is converted to CH
4
that can be utilized in the existing energy grid. The major challenge with this technology is gas-to-liquid mass transfer limitation. The microbial conversions in reactors designed for hydrogenotrophic methanogenesis were studied with microsensors for H
2
, pH, and CO
2
. The H
2
consumption potential was dependent on the CO
2
concentration, but could partially recover after CO
2
depletion. Reactors with 3-dimensional biofilm carrier material and a large gas headspace allowed for a methanogenic biofilm in direct contact with the gas phase. A high density of Methanoculleus sp. in the biofilm mediated a high rate of CH
4
production, and it was calculated that a reactor filled with 75% carrier material could mediate a biogas upgrading from 50 to 95% CH
4
within 24 h when an equivalent amount of H
2
was added.
KW - Biofilm
KW - CO limitation
KW - Mass transfer
KW - Methane
KW - Methanogenesis
KW - Microsensor
UR - http://www.scopus.com/inward/record.url?scp=85065447645&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2019.121422
DO - 10.1016/j.biortech.2019.121422
M3 - Journal article
AN - SCOPUS:85065447645
SN - 0960-8524
VL - 287
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 121422
ER -