Abstract
Carbon dioxide sequestration in power plant Ca-rich ash waste deposits
Highlights
In the light of current European CO2-trade policies and more importantly the long-term planning to achieve future climate goals, it is unavoidable that the usage of such fossil fuels as oil, coal, lignite and oil shale (OS) will diminish in coming decades
The chemical composition of the studied Eesti Power Plant (EPP) oil shale ash waste sediments has been reported by Leben et al [29]
The semicrystalline phase composition is characterized by the C-(A)-S-H-type phase with a trend of increasing content towards the bottom of the deposit, with estimated values ranging from ca 20 wt% to more than 60 wt% in the EPP depository and ca 40 wt% in Balti Power Plant (BPP) ash waste deposit drill core 6
Summary
In the light of current European CO2-trade policies and more importantly the long-term planning to achieve future climate goals (e.g. as stated in the Paris Agreement [1]), it is unavoidable that the usage of such fossil fuels as oil, coal, lignite and oil shale (OS) will diminish in coming decades. A carbon neutral economy can be realized by 2050 [2] only if we consider and apply all means capable of effectively reducing CO2 budget, including the implementation and optimization of various CO2 sequestration techniques. Different options that could help mitigate climate change, including carbon capture and storage (CCS), are already being considered worldwide. Carbon dioxide can be deposited underground in suitable rock formations, dissolved in saline aquifers or adsorbed onto the organic matter in coal or shale formations. The process requires sufficient burial depth, usually exceeding 800 meters, which provides enough pressure and temperature for achieving the supercritical state and decreases the volume of deposited CO2. When the method is used in EOR, the additional oil obtained during the process is likely to nullify any mitigation of the effect of the deposited CO2
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