EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Climate-Benign Direct Air CO2 Capture, Utilization, and Storage (DACCUS) 

Martina Leveni1 and Jeffrey M. Bielicki1,2
Martina Leveni and Jeffrey M. Bielicki
  • 1Department of Civil, Environmental, and Geodetic Engineering, The Ohio State University, 2070 Neil Avenue, Columbus, OH 43210, USA
  • 2John Glenn College of Public Affairs, The Ohio State University, 1810 College Road, Columbus, OH 43210, USA

Transitioning towards a carbon managed energy infrastructure is essential to mitigate climate change. Negative emission technologies, such as direct air CO2 capture (DACC), together with renewable energies will likely to be necessary components in the effort to slow, stop, reverse the flow of carbon dioxide (CO2) to the atmosphere. The DACC process requires heat and electricity to capture CO2 from the ambient air, the sources of which may not be climate-benign. We present an approach that combines DACC, long-term CO2 storage, and geothermal energy production: a climate-benign direct air capture, carbon utilization, and storage (DACCUS). The CO2 captured from the ambient air, is geologically stored in sedimentary basins, and circulated to the surface in a closed system to extract the available geothermal heat.  The produced heat can be used directly or converted to electricity by a power plant and used in the DACC process.  We investigate the performance of DACCUS systems, including sensitivity analyses of key parameters, such as the sorbent regeneration temperature (80-120°C), the outlet temperature the CO2 stream from the DACC (70-22°C), and reservoir permeability (1x10-15-1x10-11 m2), among others.  The results indicate that DACCUS has a promising potential for using the CO2 from DACC to produce process energy requirements. For example, with a regeneration temperature of 100°C and a DACC outlet temperature of 70°C, reservoirs with depths equal or above 3.5 km, and geothermal temperature gradients equal or above 35°C/km, can provide sufficient wellhead temperatures. In addition, the maximum DACC capacity for those temperatures increases considerably for reservoir permeability up to 5x10-14 m2, and can provide the make-up CO2 for that which migrates outside of the region in the aquifer where CO2 is circulated between the subsurface and the surface. Costs estimates for DACC are $500–600/tCO2. While also the cost of the integrated system is important, the integration with CO2-geothermal production could yield substantial savings for DACC ($0.64M - $30.6M annually of avoided electricity costs). 


How to cite: Leveni, M. and Bielicki, J. M.: Climate-Benign Direct Air CO2 Capture, Utilization, and Storage (DACCUS) , EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-9795,, 2022.