Dong Kyoo Park  Hyun Jung Yu  Soo Nam Park  Changsik Choi

Vol. 30,  No. 4, pp. 330-336, Dec.  2024
10.7464/ksct.2024.30.4.330

CCUS Municipal solid waste fly ash Carbonation Reactive CaO Upcycling

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Recently, various efforts are being made to develop carbon dioxide capture, utilization and storage (CCUS) technology to reuse carbon dioxide as a useful resource. Carbonation is attracting attention as a technology that can fix and store CO2 in a thermodynamically stable state, and the product can be used as a high-value industrial material. In this study, the carbon dioxide capture characteristics of municipal solid waste incineration fly ash were investigated using a laboratory-scale carbon dioxide capture reactor. First, the change in pH of the reaction solution according to the dissolution of Ca in the fly ash sample was investigated. In addition, the main reaction mechanism was confirmed through thermogravimetric analysis of the fly ash sample before and after the reaction. The net carbon dioxide capture amount was determined using the reactive CaO content of the sample. The carbon dioxide capture capacity and efficiency were found to be 137 g/kg and 96.8%, respectively. In addition, the carbon dioxide capture products were able to meet environmental standards for recycling by mitigating heavy metal leaching. Through this study, the applicability of the municipal solid waste incineration fly ash to carbon dioxide capture process was confirmed. The results of this study can be used as basic data for upcycling processes such as making construction materials via carbon dioxide capture products.