Green Energy & Expo

Biography

Biography: Shu-Yuan Pan

Abstract

An integrated approach to establishing a waste-to-resource supply chain within an industrial park was developed for CO₂ fixation, wastewater neutralization and product utilization using high-gravity carbonation (HiGCarb) process. Several alkaline wastes, such as steel slag and byproduct lime, were gathered for performance evaluation operated under various levels of reaction temperature, rotation speed, and liquid-to-solid (L/S) ratio. A high CO₂ capture efficiency (i.e., >95%) can be achieved via the HiGCarb process with a relatively short reaction time at ambient temperature and pressure. These alkaline wastes were found to be successfully carbonated with CO₂ in the high-gravity carbonation process, where calcite (CaCO₃) was identified as the main product.  In addition, the results indicated that the rates of metal ion leaching from the alkaline solid wastes can be prohibited by the high-gravity carbonation process. Moreover, blended cements containing 5%, 10% and 20% replacements of ordinary Portland cement with carbonated solid wastes were tested for compressive strength development and autoclave soundness. The mortars were casted into 50 mm × 50 mm × 50 mm molds, and then tested at 3, 7 and 28 days. Since the carbonated product can be used as supplementary cementitious materials, CO₂ emissions from the cement industry can be avoided if a green waste-to-resource supply chain between the petrochemical and cement industries is established. It suggests that an integrated approach to the proper treatment of alkaline wastes that permanently fixes CO₂ from industries while producing valuable supplementary cementitious materials for the cement industry can be achieved via the HiGCarb process.