Author ORCID Identifier

Document Type

Conference Paper


3.3 HEALTH SCIENCES, Public and environmental health

Publication Details

Dimotta, A., Freda, C. (2023). Thermodynamic Analysis of Digestate Pyrolysis Coupled with CO2 Sorption. In: Gervasi, O., et al. Computational Science and Its Applications – ICCSA 2023 Workshops. ICCSA 2023. Lecture Notes in Computer Science, vol 14111. Springer, Cham.


To date the management of digestate is a crucial task for anaerobic digestion process. In the present work a strategy for digestate management is thermodynamically analyzed by a commercial software for process simulation called CHEMCAD®. Pyrolysis of digestate is simulated by a minimization of the free Gibbs energy. The sequestration of the carbon dioxide (CO2) released by the pyrolysis is investigated by the addition of calcium oxide, in order to reduce CO2 emissions. The effect of the pyrolysis temperature between 400–900 °C and of the CaO/digestate mass ratio between 0–0.5 was discussed, as well. The CHEMCAD application allowed to investigate the chemisorption behaviour by focusing on the temperature-dependent CO2 sorption trends in relation to different values of the CaO mass ratio. Temperature below 650 °C should be considered for CO2 sorption by CaO. CO2 molar fraction below 10% was obtained for temperature below 450 °C and CaO/digestate mass ratio higher than 0.4.



This research received no external funding

Creative Commons License

Creative Commons Attribution-Share Alike 4.0 International License
This work is licensed under a Creative Commons Attribution-Share Alike 4.0 International License.