Mechanism for the stabilization/solidification of arsenic-contaminated soils with Portland cement and cement kiln dust

Journal of Environmental Management
In-Ho YoonMin Gyu Kim

Abstract

In this study, the mechanism for the stabilization/solidification (S/S) of arsenic (As)-contaminated soils with Portland cement (PC), and cement kiln dust (CKD) using 1 N HCl extraction fluid, X-ray powder diffraction (XRPD), X-ray absorption near edge structure (XANES) and Extended X-ray absorption fine structure (EXAFS) spectroscopy was investigated. The degree of As immobilization after stabilization was assessed using a 1 N HCl extraction on the basis of the Korean Standard Test (KST). After 1 day of curing with 30 wt% PC and 7 days of curing with 50 wt% CKD, the concentration of As leached from the amended soils was less than the Korean countermeasure standard (3 mg L(-1)). The As concentrations in the leachate treated with PC and CKD were significantly decreased at pH > 3, indicating that pH had a prevailing influence on As mobility. XRPD results indicated that calcium arsenite (Ca-As-O) and sodium calcium arsenate hydrate (NaCaAsO(4).7.5H(2)O) were present in the PC- and CKD-treated slurries as the key phases responsible for As(III) and As(V) immobilization, respectively. The XANES spectroscopy confirmed that the As(III) and As(V) oxidation states of the PC and CKD slurry samples were consistent with the speciated forms ...Continue Reading

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Citations

Aug 10, 2011·Environmental Geochemistry and Health·Myoung-Soo KoKyoung-Woong Kim
Aug 8, 2015·Journal of Hazardous Materials·Tara M ClancyKim F Hayes
May 28, 2015·Environmental Science and Pollution Research International·Deok Hyun MoonJeong-Hun Park
Dec 17, 2014·Environmental Monitoring and Assessment·Swarnalatha SomasundaramSun Kyoung Shin
Jan 18, 2017·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Jie LeiLiyuan Chai
Dec 21, 2016·Environmental Science and Pollution Research International·Shanke LiuJianming Liu
Aug 15, 2017·Environmental Monitoring and Assessment·Tahereh MansouriHossein Kouhestani
Nov 21, 2020·Journal of Nanoscience and Nanotechnology·Changsheng YueYanshan Cui

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