A SEM and X-ray study for investigation of solidified/stabilized arsenic-iron hydroxide sludge

Document Type

Article

Publication Date

2-14-2005

Abstract

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 CSH surface, replacing SO42- of ettringite, and reaction with cement components to form calcium-arsenic compounds, the solubility limiting phases. © 2004 Elsevier B.V. All rights reserved.

Identifier

13844307307 (Scopus)

Publication Title

Journal of Hazardous Materials

External Full Text Location

https://doi.org/10.1016/j.jhazmat.2004.10.019

ISSN

03043894

PubMed ID

15721543

First Page

185

Last Page

195

Issue

1-3

Volume

118

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