Abstract
The high alkalinity, chlorine, and potentially toxic elements (PTEs) content of municipal solid waste incineration fly ash (MSWI FA) hindered its potential application in construction materials. This study proposed the recovery of MSWI FA via wet carbonation and developed a novel sustainable carbonated-MSWI FA-based binder. Experimental results showed that MSWI FA achieved 12 wt% CO2 capture through wet carbonation. Besides, wet carbonation removed 82 % of chlorine from MSWI FA and reduced the leaching risk of PTEs in both pretreatment leachate and carbonated-MSWI FA. The designed sustainable paste exhibited an outstanding 28-day compressive strength of 45.6 MPa. The chloride and sulfate salts in the carbonated-MSWI FA played an important role in hydration kinetics of pastes. Sulfate in carbonated-MSWI FA reacted with aluminate to form ettringite, and the residual chloride was captured by CO3-Cl-AFm. The proposed wet carbonation route provided a promising and sustainable way for CO2 capture and facilitating the application of MSWI FA in construction materials.
Published Version
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