期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 118, 期 1-3, 页码 185-195出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2004.10.019
关键词
arsenic-iron hydroxide sludge; microstructure; SEM-EDS; immobilization mechanism; solidification/stabilization
Despite the fact that the solidification/stabilization of arsenic containing wastes with Portland cement and lime has an extensively documented history of use, the physical and chemical phenomena as a result of the interaction between arsenic and cement components have not been fully characterized. The study investigates the behavior of synthesized arsenic-iron hydroxide sludge, the by-product of arsenic removal by coagulation with ferric chloride, in solidified/stabilized matrices as well as its binding mechanisms by exploring the cementitious matrices in the micro-scale by scanning electron microscopy equipped with energy dispersive X-ray spectrometer (SEM-EDS). It was revealed that arsenic can be chemically fixed into cementitious environment of the solidified/stabilized matrices by three important immobilization mechanisms; sorption onto C-S-H surface, replacing SO42_ of ettringite, and reaction with cement components to form calcium-arsenic compounds, the solubility limiting phases. (C) 2004 Elsevier B.V. All rights reserved.
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