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Engineering | Center for Negative Carbon Emissions (CNCE)

U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy - Atmospheric Carbon Dioxide Enrichment and Delivery (ACED)

U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy
Atmospheric CO2 Enrichment and Delivery (ACED)
CO2 Capture Field Test by ASU

Under a funded DOE grant, we have engineered and built the first prototype to feed algae biomass in 1500-liter raceway ponds out at the Arizona Center for Algae Technology and Innovation (AzCATI) national testbed at ASU’s Polytechnic Campus.
Increasing the CO2 concentration in gas supplied to a microalgae growth system can improve its productivity many fold over using atmospheric air. While flue gas seems a good source of CO2 -enriched gas, its usefulness is compromised by transportation costs from the source to the site of microalgae production and its wide range of contaminants that can be toxic to the microalgae and can contaminate fuel or other high-value products.
Having a cost-effective strategy to capture and concentrate atmospheric CO2 for delivery to microalgae-growth systems will overcome both limitations of flue gas. This will enabled the high microalgae productivity needed to meet the significant global demand for high-density liquid transportation fuels. ASU integrated the novel CO2 -capture and delivery technologies, allowing a boost to microalgae productivity and cost-effectiveness.
The successful project captured and concentrated CO2 from the atmosphere using Moisture-Swing Sorption (MSS), which takes advantage of unique properties of passive collection to lower the cost of capturing CO2 from air. The material used operates on a humidity swing and captures CO2 when dry and releases it again when wetted. At release, the partial pressure of CO2 is increased roughly 100-fold over air, creating an output stream similar to flue gas, but located at the site of microalgae growth and without the contaminants. This dry-wet reaction cycle is repeatable and can be adapted for continuous operation.

This project is supported by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy Targeted Algal Biofuels and Bioproducts program under Award Number DE-EE0007093. To read more https://sites.google.com/a/asu.edu/aced/overview