Electrodialytic remediation of municipal solid waste incineration fly ash as pre-treatment before geopolymerisation with coal fly ash

Municipal solid waste incineration (MSWI) fly ash is classified as hazardous and needs to be disposed of according strict regulations. By disposal, valuable resources in the MSWI lost, other solutions are sought for. The effect electrodialytic remediation (ED) a pre-treatment for removing heavy metals from before using treated geopolymerization with coal was explored. ED increased Si reactivity Si/Al ratio. mixture 80% 20% 8 M NaOH (L/S 0.37 mL/g) found optimal, resulting compressive strength 15.3 MPa, which higher than reference geopolymer. leaching concentrations Pb, Zn, Cr, Cu Ni were below 0.02 mg/L Mn Cd at 0.023 0.027 mg/L, respectively. enhanced mechanism geopolymer confirmed by FTIR analysis SEM images. resistance against extreme environments stronger raw geopolymer, physical encapsulation geopolymeric gels contributed metal immobilization. • electrolytic pretreatment applied. MSIW moral recycling reached 20%. Physical