Assessment of heavy metals mobility and correlative recovery and decontamination from MSWI fly ash: Mechanism and hydrometallurgical process evaluation
Artikel i vetenskaplig tidskrift, 2021

Fly ash from municipal solid waste incineration (MSWI) enriches many leachable toxic metals which readily migrate into the environment, posing serious risks to the ecosystem and human. In this study, the elements mobility, leaching availability as well as the potential maximum amounts of heavy metals in fly ash were thoroughly evaluated. To decontaminate the toxic elements from resulting fly ash leachates, The aqueous zinc (Zn) was recovered using Cyanex 572, cadmium (Cd) and copper (Cu) were effectively removed through adsorption process by a self-assembled hierarchical hydroxyapatite (HAP) nanostructure. The removal mechanism of Cd, Cu and Zn by leaching, extraction and adsorption was revealed with the results from XRD, ICP-MS and SEM. The results showed that fly ash has a high mobility under maximum availability leaching test (95% of fly ash was dissolved), a recovery rate of 91% for Zn can be obtained using Cyanex 572, and a high adsorption rate (> 95% for both Cu and Cd) was reached using HAP for the pristine fly ash leachate. The outcomes from isothermal and kinetic study revealed that Langmuir isotherm and pseudo-second order model can well describe the Cd and Cu adsorption behavior. Economic assessment suggested that the application of HAP for the removal of Cd and Cu is a technically sound and economically feasible approach. The findings of this study demonstrated that this comprehensive process integrated leaching, solvent extraction and consequential decontamination can be a practical strategy for MSWI fly ash treatment.

MSWI fly ash



Metal recovery

Mobility assessment



Jinfeng Tang

Chalmers, Kemi och kemiteknik, Energi och material

Guangzhou University

Minhua Su

Guangzhou University

Hairong Peng

Guangzhou University

Qingpu Shi

Guangzhou University

Diyun Chen

Guangzhou University

Nana Wang

Guangzhou University

Enzong Xiao

Guangzhou University

Lei Huang

Guangzhou University

Hongguo Zhang

Guangzhou University

Tangfu Xiao

Guangzhou University

Science of the Total Environment

0048-9697 (ISSN)

Vol. 768 145050


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