Pizza at 11:30am
MIT 48-316 (15 Vassar St, Cambridge)
Meagan Mauter, Carnegie Mellon University
Transformational changes are needed to sustain energy and water systems in the 21st century. From decarbonizing the energy sector to building a circular water economy, these systemic transitions will require large scale infrastructure design and technology innovation. This presentation will outline these associated challenges for managing high salinity brines from geologic carbon storage and discuss a framework for evaluating potential technology and policy solutions. By combining systems analysis and technoeconomic analysis, we find that the majority of saline brines produced during the carbon sequestration process will exceed 100,000 ppm total dissolved solids. Treating this water using state-of-the-art thermal methods, including mechanical vapor recompression and crystallization, would impose significant energy penalties and negate some of the benefits of carbon storage. Identifying the need for energy efficient high salinity brine treatment, we developed a novel, membrane-based approach for concentrating high salinity brines entitled Osmotically Assisted Reverse Osmosis (OARO). Finally, we perform a cost optimization of OARO configurations, demonstrating that while the cost optimal and energy optimal configurations are not equivalent for this system, the cost-optimal configuration for OARO dominates MVC on both cost and energy consumption metrics.