Engineers say they have demonstrated a cost-effective way to remove carbon dioxide from the atmosphere. The extracted CO2 could be used to make new fuels or go to storage.
The process of direct air capture (DAC) involves giant fans drawing ambient air into contact with an aqueous solution that traps CO2 . Through heating and several chemical reactions, CO2 is re-extracted and ready for further use.
‘The carbon dioxide generated via DAC can be combined with sequestration for carbon removal, or it can enable the production of carbon-neutral hydrocarbons, which is a way to take low-cost carbon-free power sources like solar or wind and channel them into fuels to decarbonise the transportation sector,’ said David Keith, founder of Carbon Engineering, a Canadian clean fuels enterprise, and a Professor of Physics at Harvard University, US.
Fuel from the Air – Sossina Haile. Video: TEDx Talks
DAC is not new, but its feasibility has been disputed. Now, Carbon Engineering reports how its pilot plant in British Columbia has been using standard industrial equipment since 2015. Keith’s team claims that a 1 Mt- CO2 /year DAC plant will cost $94-$232/ton of CO2 captured. Previous theoretical estimates have ranged up to $1000/ton.