Co-disposal of construction and demolition waste (CDW) and municipal solid waste incineration fly ash (MSWI FA) through geopolymer technology. (15th August 2022)

• Record Type: Journal Article
• Authors: Tan, Jiawei; De Vlieger, Jentel; Desomer, Peter; Cai, Jingming; Li, Jiabin
• Is Part Of: Journal of cleaner production. Volume 362(2022)
• Publication Date: 2022-08-15
• Subjects: Municipal solid waste incineration fly ash (MSWI FA) -- Construction and demolition waste (CDW) -- Geopolymer -- Co-disposal -- Heavy metals; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.132502
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: To simultaneously address the environmental issues induced by construction and demolition waste (CDW) and municipal solid waste incineration fly ash (MSWI FA), this paper studied the feasibility of utilizing CDW-based geopolymer (CDWG) as the solidification/stabilization (S/S) solid for MSWI FA. The effects of MSWI FA addition on the performance and reaction of CDWG were investigated by compressive strength, reaction heat evaluation, FTIR, XRD, TGA, SEM, and EDXA tests. The S/S effect of CDWG was evaluated by the leaching tests. Results showed that the CDWG implemented the S/S of MSWI FA, with an immobilization efficiency of Pb > Ba > Zn > Cd > Ni > Cr > Cu. Heavy metals were partly immobilized in the geopolymeric gels. MSWI FA altered the reaction kinetics and promoted the reaction product formation in CDWG, without resulting in the generation of new crystalline phases. An MSWI FA dosage lower than 5 wt% can improve the compressive strength of geopolymer. CDWG shows significantly lower energy consumption (a reduction up to 75.7%) and carbon dioxide emissions (a decline up to 75.9%) than OPC when immobilizing the same amount of MSWI FA.