Continuous CO2 capture and MSWI fly ash stabilization, utilizing novel dynamic equipment

Novel dynamic equipment with gas in and out continuously was developed to study the capture capacity of CO2. Municipal solid waste incineration (MSWI) fly ash has a high capture rate of CO2 in CO2-rich gas. Fly ash can sequester pure CO2 rapidly, and its capacity is 16.3 g CO2/100 g fly ash with no water added and 21.4 g CO2/100 g fly ash with 20% water added. For simulated incineration gas containing 12% CO2, the capture rate decreased and the capacity was 13.2 g CO2/100 g fly ash with no water added and 18.5 g CO2/100 g fly ash with 20% water added. After accelerated carbonation, the C and O contents increased, indicating CO2 capture in the fly ash; CO2 combines with Ca(OH)2 to form CaCO3, which increased the CaCO3 content from 12.5 to 54.3%. The leaching of Pb markedly decreased from 24.48 to 0.111 mg/L.