Main content area

Synergies between Geological Sequestration and Microalgae Biofixation for Greenhouse Gas Abatement: Life Cycle Design of Carbon Capture, Utilization, and Storage Supply Chains

Yue, Dajun, Gong, Jian, You, Fengqi
ACS sustainable chemistry 2015 v.3 no.5 pp. 841-861
algorithms, biomass production, carbon, carbon dioxide, case studies, green chemistry, greenhouse gas emissions, greenhouse gases, infrastructure, life cycle design, microalgae, models, supply chain, transportation, Texas
We address the integration of two greenhouse gas (GHG) abatement options, namely, geological sequestration and microalgae biofixation, using a supply chain optimization approach. A multiscale, multiperiod, mixed-integer nonlinear programming (MINLP) model is proposed, which accounts for CO₂ transportation pipeline network design, algae processing route, and product selection, as well as the seasonality in CO₂ source availability and algal biomass productivity. The model allows for pipeline transportation of both supercritical CO₂ and feed gas. By using the Life Cycle Optimization framework, we simultaneously optimize the economic and environmental performances. We employ an improved branch-and-refine algorithm for efficient global optimization of the resulting nonconvex MINLP problems. We consider a case study on the optimal design of potential CO₂ capture, utilization, and storage infrastructures in the state of Texas. By taking advantage of the synergies between these two GHG abatement options, the CO₂ emissions can be sequestrated and utilized at an average cost of $45.52/tCO₂, and about 64% of the GHGs can be avoided from entering the atmosphere.