TY - JOUR
T1 - Co-digestion of municipal waste biopulp with marine macroalgae focusing on sodium inhibition
AU - Tsapekos, Panagiotis
AU - Alvarado-Morales, Merlin
AU - Kougias, Panagiotis
AU - Konstantopoulos, Konstantinos
AU - Angelidaki, Irini
PY - 2019
Y1 - 2019
N2 - The anaerobic digestion (AD) of municipal biopulp with two macroalgal biomasses (i.e. Saccharina latissima and Fucus serratus) was investigated at batch and continuously fed digesters at thermophilic conditions (54 ± 1 °C). At batch mono-digestion tests, municipal biopulp was associated with significantly higher methane production (549 ± 9 mLCH4/gVS) compared to both S. latissima (210 ± 13 mLCH4/gVS) and F. serratus (206 ± 37 mLCH4/gVS). Regarding batch co-digestion tests, the highest methane yield was achieved when the feedstock consisted of 80% VS of biopulp and 20% VS of macroalgal biomass and it corresponded to the single methane contributions. The batch results were confirmed by continuous mode operation experiments, for the mono-digestion of biopulp and subsequently, the co-digestion with S. latissima. A specific challenge encountered with macroalgae biomethanation is the high sodium content. Therefore, mathematical modelling was followed to predict the performance of continuous mode experiments under increased salinity conditions by simulating the addition of more saline feedstock. The experimental results were used to calibrate and validate the model. Modelling simulations revealed that usage of saline feedstocks can drastically inhibit a well-performing AD reactor.
AB - The anaerobic digestion (AD) of municipal biopulp with two macroalgal biomasses (i.e. Saccharina latissima and Fucus serratus) was investigated at batch and continuously fed digesters at thermophilic conditions (54 ± 1 °C). At batch mono-digestion tests, municipal biopulp was associated with significantly higher methane production (549 ± 9 mLCH4/gVS) compared to both S. latissima (210 ± 13 mLCH4/gVS) and F. serratus (206 ± 37 mLCH4/gVS). Regarding batch co-digestion tests, the highest methane yield was achieved when the feedstock consisted of 80% VS of biopulp and 20% VS of macroalgal biomass and it corresponded to the single methane contributions. The batch results were confirmed by continuous mode operation experiments, for the mono-digestion of biopulp and subsequently, the co-digestion with S. latissima. A specific challenge encountered with macroalgae biomethanation is the high sodium content. Therefore, mathematical modelling was followed to predict the performance of continuous mode experiments under increased salinity conditions by simulating the addition of more saline feedstock. The experimental results were used to calibrate and validate the model. Modelling simulations revealed that usage of saline feedstocks can drastically inhibit a well-performing AD reactor.
KW - Biopulp
KW - Macroalgae
KW - Biogas production
KW - Modelling
KW - Sodium inhibition
U2 - 10.1016/j.enconman.2018.11.048
DO - 10.1016/j.enconman.2018.11.048
M3 - Journal article
SN - 0196-8904
VL - 180
SP - 931
EP - 937
JO - Energy Conversion and Management
JF - Energy Conversion and Management
ER -