eesti teaduste
akadeemia kirjastus
SINCE 1984
Oil Shale cover
Oil Shale
ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)
Impact Factor (2020): 0.934

Carbon dioxide sequestration in power plant Ca-rich ash waste deposits; pp. 65–88

Full article in PDF format | 10.3176/oil.2021.1.04

Kristjan Leben, Riho Mõtlep, Alar Konist, Tõnu Pihu, Kalle Kirsimäe


In order to reach future goals of net carbon neutrality and climate change mitigation, various carbon capture and sequestration techniques must be implemented. Industrial waste rich in chemically active alkaline metal oxides is considered as a potential material for CO2 sequestration. The authors studied the long-term CO2 binding capacity of Ca-rich oil shale ash (OSA) deposits at oil shale(OS)-fired power plants of Estonia and estimated the remaining sequestration potential for in-situ carbonation. Providing energy security, the Estonian oil shale industry is the biggest national producer of solid waste and the leading greenhouse gas emitter, making the country one of the largest per capita producers of CO2 in Europe. The study shows that ash deposits are currently only partially carbonated, with an average CO2 binding rate of 51 kg per tonne of hydrated sediment, most of which being bound in such carbonate minerals as calcite and vaterite, as well as in Ca-silicate thaumasite. It is estimated that at full carbonation of reactive Ca and Mg phases in ash (portlandite, ettringite and semicrystalline C-S-H), the projected average total CO2 binding potential could rise to ca 200 kg per tonne of ash.


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