title: Co-disposal of MSWI fly ash and Bayer red mud using an one-part geopolymeric system.
abstract: In this research, Bayer red mud (RM) was pretreated through alkali-thermal activation process, and prepared as an one-part geopolymer precursor, which could be used as geopolymeric solidification/stabilization (S/S) reagent for municipal solid waste incineration fly ash (MSWI FA). Compressive strength test, modified TCLP leaching test and sequential extraction test were conducted to evaluate the effectiveness of the RM-based geopolymeric S/S reagent. The results show that the S/S effects for heavy metals of RM-based geopolymer exhibit the following order: Pb>Cu>Zn>Cr. Most of the Zn, Pb and Cu in the MSWI FA transform from the leachable fractions into the inactive fractions difficult or unavailable to leach out. In the geopolymeric S/S solid, the active aluminosilicates in MSWI FA are dissolved in the alkaline environment formed by pretreated RM and then participate in the geopolymerization, which increases the SiO2/Al2O3 ratio and enhances the structural stability of geopolymeric S/S solid. MSWI FA offsets the strength deterioration of RM based one-part geopolymer and improves the immobilization efficiency for heavy metals in the geopolymer structure.
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Ye
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Chen
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China. Electronic address: jkyang@mail.hust.edu.cn.
authors.forename: Jiakuan
authors.initials: J
authors.lastname: Yang
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China.
authors.forename: Sha
authors.initials: S
authors.lastname: Liang
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Hu
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Xiao
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
authors.forename: Qifei
authors.initials: Q
authors.lastname: Huang
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China.
authors.forename: Yafei
authors.initials: Y
authors.lastname: Shi
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China.
authors.forename: Jingping
authors.initials: J
authors.lastname: Hu
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Wu
keywords: Geopolymer; Heavy metals; MSWI fly ash; Red mud; Solidification/stabilization