Lab-Scale Carbonation of Wood Ash for CO 2 -Sequestration

Robin Koch, Gregor Sailer, Sebastian Paczkowski, Stefan Pelz, Jens Poetsch and Joachim Müller
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Robin Koch: Department of Bioenergy, University of Applied Forest Sciences Rottenburg, Schadenweilerhof, 72108 Rottenburg, Germany
Gregor Sailer: Department of Bioenergy, University of Applied Forest Sciences Rottenburg, Schadenweilerhof, 72108 Rottenburg, Germany
Sebastian Paczkowski: Department of Forest Work Science and Engineering, Faculty of Forest Sciences and Forest Ecology, University of Göttingen, Büsgenweg 4, 37077 Göttingen, Germany
Stefan Pelz: Department of Bioenergy, University of Applied Forest Sciences Rottenburg, Schadenweilerhof, 72108 Rottenburg, Germany
Jens Poetsch: Department of Bioenergy, University of Applied Forest Sciences Rottenburg, Schadenweilerhof, 72108 Rottenburg, Germany
Joachim Müller: Tropics and Subtropics Group, Institute of Agricultural Engineering, University of Hohenheim, Garbenstrasse 9, 70599 Stuttgart, Germany

Energies, 2021, vol. 14, issue 21, 1-11

Abstract: This study evaluated the CO 2 sequestration potential with combustion ashes in the aqueous phase. The aim was to provide a cost-effective carbon sequestration method for combustion unit operators (flue gas cleaning) or biogas producers (biogas upgrading). Therefore, two separate test series were executed to identify the carbonation efficiency (CE) of bottom wood ash (1) at different mixing ratios with water in batch experiments and (2) under dynamic flow conditions. It was furthermore evaluated whether subsequent use of the carbonated wood ash for soil amendment could be possible and whether the process water could be passed into the sewage. The batch test series showed that different mixing ratios of wood ash and water had an influence on the CE. The flow series showed that the mean CE varied between approximately 14% and 17%. Thus, the ash proved to be suitable for carbonation processes. The process water was dischargeable, and the carbonated wood ash has potential for chalking, as no legal thresholds were exceeded. Therefore, wood ash carbonation could be used as a low-tech CO 2 sequestration technology. Compared to existing energy consuming and cost intensive carbon capture and storage technologies, sequestration with ash could be beneficial, as it represents a low-tech approach.

Keywords: carbon capture and storage (CCS); biogas upgrading; combustion; anaerobic digestion; calcium oxide; fertilizers; flue gas (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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