title: Kinetic modeling on CO₂ capture using basic oxygen furnace slag coupled with cold-rolling wastewater in a rotating packed bed.
abstract: In this study, direct and indirect carbonation of basic oxygen furnace slag (BOFS) coupled with cold-rolling wastewater (CRW) was carried out via a rotating packed bed (RPB). The solid products were qualitatively characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) and quantitatively analyzed with thermogravimetric analysis (TGA). The leachate was analyzed with inductively coupled plasma-optical emission spectroscopy (ICP-OES). The results indicate that the maximum achievable carbonation conversion (MACC) of BOFS was 90.7%, corresponding to a capture capacity of 0.277 g CO₂/g of BOFS, by direct carbonation with CRW under a rotation speed of 750 rpm at 30 °C for 20 min. In addition, CO₂ mass balance among the gas, liquid, and solid phases within an RPB was well-developed, with an error less than 10%, to confirm the actual CO₂ capture capacity of BOFS with precision and accuracy. Furthermore, a reaction kinetic model based on mass balance was established to determine the reaction rate constant for various liquid agents (CRW and pure water). It was concluded that co-utilization of alkaline wastes including BOFS and CRW via the RPB is a novel approach for both enhancing CO₂ capture capacity and reducing the environmental impacts of alkaline wastes.
authors.affiliation: Department of Biochemistry, Taipei Medical University, Taipei, Taiwan.
authors.forename: E-E
authors.initials: EE
authors.lastname: Chang
authors.forename: Tse-Lun
authors.initials: TL
authors.lastname: Chen
authors.forename: Shu-Yuan
authors.initials: SY
authors.lastname: Pan
authors.forename: Yi-Hung
authors.initials: YH
authors.lastname: Chen
authors.forename: Pen-Chi
authors.initials: PC
authors.lastname: Chiang
mesh_terms: D000393:Air Pollutants; D002119:Calcium Carbonate / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry*; D003252:Construction Materials; D004867:Equipment Design; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007477:Ions; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D010100:Oxygen / Q000737:chemistry*; D013232:Steel; D013696:Temperature; D013818:Thermogravimetry; D013997:Time Factors; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D000393:Air Pollutants; D002119:Calcium Carbonate; D002244:Carbon; D002245:Carbon Dioxide; D007220:Industrial Waste; D007477:Ions; D010100:Oxygen; D013232:Steel; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Accelerated carbonation; Mass balance; Mass transfer coefficient; Material balance; Reaction rate constant