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

Panagiotis Tsapekos, Merlin Alvarado-Morales, Panagiotis Kougias, Konstantinos Konstantopoulos, Irini Angelidaki*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


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.
Original languageEnglish
JournalEnergy Conversion and Management
Pages (from-to)931-937
Publication statusPublished - 2019


  • Biopulp
  • Macroalgae
  • Biogas production
  • Modelling
  • Sodium inhibition


Dive into the research topics of 'Co-digestion of municipal waste biopulp with marine macroalgae focusing on sodium inhibition'. Together they form a unique fingerprint.

Cite this