Sophia, Carmalin A and Sandhya, S and Swaminathan, K (2010) Solidification and stabilization of chromium laden wastes in cementitious binders. Current Science, 99 (3). pp. 365-369. ISSN 0011-3891

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Solidification/stabilization (S/S) technology was applied to a simulated sludge containing chromium. Leaching tests such as toxicity characteristic leaching procedure (TCLP), ANS 16.1 and multiple TCLP tests conducted on stabilized blocks showed that chromium was immobilized by the binder studied. A linear relationship was obtained between the cumulative fraction of chromium leached and time1/2 in the stabilized samples proving that chromium is leached by diffusion. The leachability indices obtained for the solidified materials satisfy the guidance value as per US Nuclear Regulatory Commission. Chromium concentrations in the TCLP leachates were well within the regulatory levels of the United States Environmental Protection Agency. Microchemistry and morphology of the stabilized samples were studied using Fourier transformation infrared (FTIR) technique and scanning electron microscopy (SEM). FTIR confirms the presence of ν2 CO3 band and O–H stretching of Ca(OH)2 and SEM shows uniform dense crystalline morphologies in all the samples. X-ray diffraction indicates the presence of bentorite, which proves that Cr replaces Al in the ettringite

Item Type: Article
Uncontrolled Keywords: Bentorite; Leachability Index; Sludge; Solidification; Stabilization; Toxicity Characteristic Leaching procedure.
Subjects: Industrial Wastewater Treatment & Disposal
Solid and Hazardous Wastes
Solid Waste Characterization
Solid Waste Treatment & Disposal
Environmental Pollution
Chemistry, Chemical Technology
Depositing User: Dr Carmalin Sophia
Date Deposited: 19 Mar 2014 12:03
Last Modified: 19 Mar 2014 12:03

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