Tuesday, April 12, 2016: 11:30 AM
336A (Hilton Americas - Houston)
In this study, an integrated approach to establishing a waste-to-resource supply chain among different industries was developed for CO2 capture, wastewater neutralization and product utilization via a high-gravity carbonation (HiGCarb) process, i.e., rotating packed bed (RPB). According to our previous experience, a high CO2 capture efficiency (i.e., >98%) can be achieved by utilizing basic oxygen furnace slag (BOFS) and cold-rolling wastewater (CRW) via the HiGCarb process with a relatively short reaction time at ambient temperature and pressure. The objectives of this study were (1) to evaluate the resource potential of alkaline solid wastes in Taiwan for CO2 capture and utilization using the HiGCarb process in Taiwan, (2) to quantify the pollution emissions and environmental impacts of the HiGCarb process from the cradle-to-gate life-cycle, (3) to calculate the water, carbon, and land footprints of the HiGCarb process, and (4) to establish the techno-economic analysis (TEA) of the HiGCarb process at an industrial-plant scale. The alkaline wastes were found to be successfully carbonated with CO2 in the HiGCarb process, where calcite (CaCO3) was identified as the main product. Since the reacted product (e.g., carbonated solid wastes) can be used as supplementary cementitious materials, CO2 emissions from the cement industry can be also avoided if a green waste-to-resource supply chain between the steelmaking and cement industries is established. It was concluded that an integrated approach to the proper treatment of alkaline wastes that permanently fixes CO2 from the petrochemical industry while producing valuable supplementary cementitious materials for the cement industry can be achieved via the HiGCarb process.