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

Tanapon Phenrat; Taha F. Marhaba; Manaskorn Rachakornkij

doi:10.1016/j.jhazmat.2004.10.019

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

Tanapon Phenrat
, Taha F. Marhaba
, Manaskorn Rachakornkij

Civil and Environmental Engineering

Research output: Contribution to journal › Article › peer-review

84 Scopus citations

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 SO₄^2- of ettringite, and reaction with cement components to form calcium-arsenic compounds, the solubility limiting phases.

Original language	English (US)
Pages (from-to)	185-195
Number of pages	11
Journal	Journal of Hazardous Materials
Volume	118
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jhazmat.2004.10.019
State	Published - Feb 14 2005

All Science Journal Classification (ASJC) codes

Environmental Engineering
Environmental Chemistry
Waste Management and Disposal
Pollution
Health, Toxicology and Mutagenesis

Keywords

Arsenic-iron hydroxide sludge
Immobilization mechanism
Microstructure
SEM-EDS
Solidification/stabilization

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10.1016/j.jhazmat.2004.10.019

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

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.",

keywords = "Arsenic-iron hydroxide sludge, Immobilization mechanism, Microstructure, SEM-EDS, Solidification/stabilization",

author = "Tanapon Phenrat and Marhaba, \{Taha F.\} and Manaskorn Rachakornkij",

note = "Funding Information: This research work was funded by the National Research Center for Environmental and Hazardous Waste Management, Chulalongkorn University, Bangkok, Thailand and the New Jersey Applied Water Research Center, New Jersey Institute of Technology, Newark, NJ, USA. The authors also would like to express gratitude to the Scientific and Technological Research Equipment Center of Chulalongkorn University, especially Mr. Boonlur who gave many helpful suggestions. The assistance of Dr. Khemarath Osathaphan is also gratefully acknowledged.",

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doi = "10.1016/j.jhazmat.2004.10.019",

language = "English (US)",

volume = "118",

pages = "185--195",

journal = "Journal of Hazardous Materials",

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AU - Marhaba, Taha F.

AU - Rachakornkij, Manaskorn

N1 - Funding Information: This research work was funded by the National Research Center for Environmental and Hazardous Waste Management, Chulalongkorn University, Bangkok, Thailand and the New Jersey Applied Water Research Center, New Jersey Institute of Technology, Newark, NJ, USA. The authors also would like to express gratitude to the Scientific and Technological Research Equipment Center of Chulalongkorn University, especially Mr. Boonlur who gave many helpful suggestions. The assistance of Dr. Khemarath Osathaphan is also gratefully acknowledged.

PY - 2005/2/14

Y1 - 2005/2/14

N2 - 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.

AB - 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.

KW - Arsenic-iron hydroxide sludge

KW - Immobilization mechanism

KW - Microstructure

KW - SEM-EDS

KW - Solidification/stabilization

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

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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