March 2024 | Hannah E. Holmes, Matthew J. Realf, Ryan P. Lively
Direct air capture (DAC) technologies face significant challenges due to water's role in various processes, affecting materials, regeneration, and product streams. Water management is crucial for economic viability and environmental impact, but high energy demands necessitate heat integration. Strategies for water management include front-end approaches like partial and full dehydration, and back-end methods such as mechanical vapor compression. These strategies aim to reduce energy intensity and carbon footprint by integrating heat recovery. Water management in DAC systems is essential for productivity, energy requirements, and material longevity. Different DAC technologies, including temperature swing absorption, electrochemistry, and moisture swing adsorption, face unique water-related challenges. Effective water management requires careful consideration of humidity, temperature, and process integration. The study highlights the importance of water management in DAC systems, emphasizing the need for further research into variable climate conditions and water quality impacts. The integration of heat recovery with water management is vital for the success of DAC technologies, and future work should focus on quantifying these strategies and assessing their environmental and economic impacts.Direct air capture (DAC) technologies face significant challenges due to water's role in various processes, affecting materials, regeneration, and product streams. Water management is crucial for economic viability and environmental impact, but high energy demands necessitate heat integration. Strategies for water management include front-end approaches like partial and full dehydration, and back-end methods such as mechanical vapor compression. These strategies aim to reduce energy intensity and carbon footprint by integrating heat recovery. Water management in DAC systems is essential for productivity, energy requirements, and material longevity. Different DAC technologies, including temperature swing absorption, electrochemistry, and moisture swing adsorption, face unique water-related challenges. Effective water management requires careful consideration of humidity, temperature, and process integration. The study highlights the importance of water management in DAC systems, emphasizing the need for further research into variable climate conditions and water quality impacts. The integration of heat recovery with water management is vital for the success of DAC technologies, and future work should focus on quantifying these strategies and assessing their environmental and economic impacts.