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Characteristics of the stabilized/solidified municipal solid wastes incineration fly ash and the leaching behavior of Cr and Pb.
- Source :
- Frontiers of Environmental Science & Engineering; Feb2016, Vol. 10 Issue 1, p192-200, 9p
- Publication Year :
- 2016
-
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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20952201
- Volume :
- 10
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Frontiers of Environmental Science & Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 111406465
- Full Text :
- https://doi.org/10.1007/s11783-014-0719-0