Co-digestion of municipal waste biopulp with marine macroalgae focusing on sodium inhibition

[Display omitted] •Biogas production from municipal biopulp and macroalgae was examined.•High methane yield was achieved when the share of biopulp was 80% VS.•Co-digestion process was sufficiently succeeded in a continuously fed digester.•The experiments were validated using the BioModel with high p...

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Bibliographic Details
Published in:Energy conversion and management 2019-01, Vol.180, p.931-937
Main Authors: Tsapekos, Panagiotis, Alvarado-Morales, Merlin, Kougias, Panagiotis G., Konstantopoulos, Konstantinos, Angelidaki, Irini
Format: Article
Language:English
Subjects:
Algae
Anaerobic digestion
Biogas production
Biopulp
Computer simulation
Macroalgae
Mathematical models
Methane
Modelling
Municipal wastes
Raw materials
Sodium
Sodium inhibition
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Summary:[Display omitted] •Biogas production from municipal biopulp and macroalgae was examined.•High methane yield was achieved when the share of biopulp was 80% VS.•Co-digestion process was sufficiently succeeded in a continuously fed digester.•The experiments were validated using the BioModel with high prediction accuracy.•BioModel revealed that aceticlastic methanogens are strongly inhibited by sodium. 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.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2018.11.048