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Solidification and stabilization of chromium laden wastes in cementitious binders

IR@CSIR-NEERI

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Title Solidification and stabilization of chromium laden wastes in
cementitious binders
 
Creator Sophia, Carmalin A
Sandhya, S
Swaminathan, K
 
Subject Industrial Wastewater Treatment & Disposal
Solid and Hazardous Wastes
Solid Waste Characterization
Solid Waste Treatment & Disposal
Environmental Pollution
Chemistry, Chemical Technology
 
Description 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
 
Publisher Indian Academy of Sciences
 
Date 2010-08-10
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/432/1/365.pdf
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
 
Relation http://www.currentscience.ac.in/Downloads/article_id_099_03_0370_0375_0.pdf
http://neeri.csircentral.net/432/