Leaching of heavy metals from MSWI fly ash : experiments vs. simulation

• Autorzy: Qiu Q , Jiang X. , Chen Z. , Lu S. , Ni M.

Identyfikatory

DOI

10.24425/119691

• Języki publikacji: EN

Abstrakty

EN

In this work, pH-dependence experiments and leaching modeling using Visual MINTEQ were performed to evaluate the stability and simulate the leaching characteristics of heavy metals in municipal solid waste incineration (MSWI) fly ash. Modeling the equilibrium concentration of Cd, Cu, Cr, Ni, Pb and Zn in raw and treated fly ash was the main target and was conducted over a pH range of 0.5–14. In addition, simulation of the leaching behavior of MSWI fly ash with different additives was also conducted. The treated fly ash was solidified by a microwave-assisted hydrothermal process with added phosphate. The initial elemental concentrations of MSWI fly ash, including raw and treated fly ash, were detected by a microwave apparatus and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The ICP-AES analysis showed that most leaching concentrations of treated fly ash decreased considerably compared to the raw fly ash. The simulation results indicated that the dissolution/precipitation simulation models of Zn, Cu and Pb were broadly consistent with the experimental results, while the leaching behaviors of Ni, Cr and Cd were determined by both dissolution/precipitation and surface complexation mechanisms. In addition, the models of reagent solidification revealed that the stabilization effect of Na₂S was better than that of Na₂CO₃. This model will be useful in the evaluation of the leaching concentrations of heavy metals in fly ash.

Słowa kluczowe

EN

simulation; MSWI fly ash; microwave; hydrothermal treatment; Visual MINTEQ

• Wydawca: Institute of Environmental Engineering, Polish Academy of Sciences
• Czasopismo: Archives of Environmental Protection
• Rocznik: 2018
• Tom: Vol. 44, no. 2
• Strony: 55--61
• Opis fizyczny: Bibliogr. 22 poz., tab., wykr.

Twórcy

autor

Qiu Q

• Institute for Thermal Power Engineering, Zhejiang University, China

autor

Jiang X.

• Institute for Thermal Power Engineering, Zhejiang University, China

autor

Chen Z.

• Institute for Thermal Power Engineering, Zhejiang University, China

autor

Lu S.

• Institute for Thermal Power Engineering, Zhejiang University, China

autor

Ni M.

• Institute for Thermal Power Engineering, Zhejiang University, China

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).