Characteristics of the stabilized/solidified municipal solid wastes incineration fly ash and the leaching behavior of Cr and Pb

doi:10.1007/s11783-014-0719-0

Front. Environ. Sci. Eng.

2016, Vol. 10

Issue (1) : 192-200 https://doi.org/10.1007/s11783-014-0719-0

RESEARCH ARTICLE

Characteristics of the stabilized/solidified municipal solid wastes incineration fly ash and the leaching behavior of Cr and Pb

Yan SHAO¹,Haobo HOU¹,Guangxing WANG²,Sha WAN¹,Min ZHOU^1,^*(

)

1. School of Resource and Environment Science, Wuhan University, Wuhan 430072, China
2. GNSS Research Center, Wuhan University, Wuhan 430072, China

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Abstract

Fly ash is a hazardous byproduct of municipal solid wastes incineration (MSWI). An alkali activated blast furnace slag-based cementitious material was used to stabilize/solidify the fly ash at experimental level. The characteristics of the stabilized/solidified fly ash, including metal leachability, mineralogical characteristics and the distributions of metals in matrices, were tested by toxic characteristic leaching procedure (TCLP), X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectrometer (SEM-EDS) respectively. Continuous acid extraction was utilized to extract metal ions and characterize their leaching behavior. The stabilization/solidification procedure for MSWI fly ash demonstrates a strong fixing capacity for the metals by the formation of C-S-H phase, hydrated calcium aluminosilicate and ettringite. The stabilized/solidified fly ash shows a dense and homogeneous microstructure. Cr is mainly solidified in hydrated calcium aluminosilicate, C-S-H and ettringite phase through physical encapsulation, precipitation, adsorption or substitution mechanisms, and Pb is mainly solidified in C-S-H phase and absorbed in the Si-O structure.

Keywords municipal solid waste incineration (MSWI) fly ash blast furnace slag leaching behavior Cr Pb

Corresponding Author(s): Min ZHOU

Online First Date: 12 June 2014 Issue Date: 03 December 2015

Cite this article:

Yan SHAO,Haobo HOU,Guangxing WANG, et al. Characteristics of the stabilized/solidified municipal solid wastes incineration fly ash and the leaching behavior of Cr and Pb[J]. Front. Environ. Sci. Eng., 2016, 10(1): 192-200.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-014-0719-0
https://academic.hep.com.cn/fese/EN/Y2016/V10/I1/192

Tab.1 Mixture proportions of different solidification matrices.

Fig.1 TCLP results of Pb and Cr from solidified samples

Fig.2 X-ray diffraction patterns of samples H10, H20, H30, H40, H50, H60 and H70

Fig.3 X-ray diffraction patterns of samples H1, H2, H3, H4, H5, H6 and H7

Fig.4 EDS spectrum focusing on C-S-H microstructure (+) in sample H1

Fig.5 EDS spectrums focusing on C-S-H and ettringite microstructure (+) in sample H6

Fig.6 SEM images of samples H1, H2, H3 and H4

Fig.7 The pH curve of leachate (square) and fractions of Cr (dot) and Pb (triangle) dissolution in continuous acid extraction test

Fig.8 X-ray diffraction patterns of residues in each stage of continuous acid extraction test

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