TY - JOUR
T1 - Ex-situ biogas upgrading in thermophilic up-flow reactors
T2 - The effect of different gas diffusers and gas retention times
AU - Ghofrani-Isfahani, Parisa
AU - Tsapekos, Panagiotis
AU - Peprah, Maria
AU - Kougias, Panagiotis
AU - Zhu, Xinyu
AU - Kovalovszki, Adam
AU - Zervas, Athanasios
AU - Zha, Xiao
AU - Jacobsen, Carsten S.
AU - Angelidaki, Irini
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021
Y1 - 2021
N2 - Four different types of ceramic gas distributors (Al2O3 of 1.2 μm and SiC of 0.5, 7 and 14 μm) were evaluated to increase biomethane formation during ex-situ biogas upgrading process. Each type of gas diffuser was tested independently at three different gas retention times of 10, 5 and 2.5 h, at thermophilic conditions. CH4 production rate increased by increasing input gas flow rate for all type of distributors, whereas CH4 concentration declined. Reactors equipped with SiC gas distributors effectively improved biomethane content fulfilling natural gas standards. Microbial analysis showed high abundance of hydrogenotrophic methanogens and proliferated syntrophic bacteria, i.e. syntrophic acetate oxidizers and homoacetogens, confirming the effect of H2 to alternate anaerobic digestion microbiome and enhance hydrogenotrophic methanogenesis. A detailed anaerobic bioconversion model was adapted to simulate the operation of the R1-R4 reactors. The model was shown to be effective for the simulation of biogas upgrading process in up-flow reactors.
AB - Four different types of ceramic gas distributors (Al2O3 of 1.2 μm and SiC of 0.5, 7 and 14 μm) were evaluated to increase biomethane formation during ex-situ biogas upgrading process. Each type of gas diffuser was tested independently at three different gas retention times of 10, 5 and 2.5 h, at thermophilic conditions. CH4 production rate increased by increasing input gas flow rate for all type of distributors, whereas CH4 concentration declined. Reactors equipped with SiC gas distributors effectively improved biomethane content fulfilling natural gas standards. Microbial analysis showed high abundance of hydrogenotrophic methanogens and proliferated syntrophic bacteria, i.e. syntrophic acetate oxidizers and homoacetogens, confirming the effect of H2 to alternate anaerobic digestion microbiome and enhance hydrogenotrophic methanogenesis. A detailed anaerobic bioconversion model was adapted to simulate the operation of the R1-R4 reactors. The model was shown to be effective for the simulation of biogas upgrading process in up-flow reactors.
KW - 16S rRNA gene sequencing
KW - Biomethanation
KW - Ceramic membrane
KW - Ex-situ biogas upgrading
KW - Gas-liquid mass transfer rate
U2 - 10.1016/j.biortech.2021.125694
DO - 10.1016/j.biortech.2021.125694
M3 - Journal article
C2 - 34352646
AN - SCOPUS:85111584250
SN - 0960-8524
VL - 340
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 125694
ER -