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

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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 CS-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.

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Authors and Affiliations

  1. School of Resource and Environment Science, Wuhan University, Wuhan, 430072, China

    Yan Shao, Haobo Hou, Sha Wan & Min Zhou

  2. GNSS Research Center, Wuhan University, Wuhan, 430072, China

    Guangxing Wang

Authors
  1. Yan Shao
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  2. Haobo Hou
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  3. Guangxing Wang
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  4. Sha Wan
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  5. Min Zhou
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Correspondence to Min Zhou.

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Shao, Y., Hou, H., Wang, G. et al. Characteristics of the stabilized/solidified municipal solid wastes incineration fly ash and the leaching behavior of Cr and Pb. Front. Environ. Sci. Eng. 10, 192–200 (2016). https://doi.org/10.1007/s11783-014-0719-0

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  • DOI: https://doi.org/10.1007/s11783-014-0719-0

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