Solidification and stabilization of chromium laden wastes in cementitious binders
IR@NEERI: National Environment Engineering Research Institute
View Archive Info| Field | Value | |
| Title |
Solidification and stabilization of chromium laden wastes in
cementitious binders
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| Creator |
Sophia, Carmalin A
Sandhya, S Swaminathan, K |
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| Subject |
Industrial Wastewater Treatment & Disposal
Solid and Hazardous Wastes Solid Waste Characterization Solid Waste Treatment & Disposal Environmental Pollution Chemistry, Chemical Technology |
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| 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
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| Publisher |
Indian Academy of Sciences
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| Date |
2010-08-10
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| 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 |
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| Relation |
http://www.currentscience.ac.in/Downloads/article_id_099_03_0370_0375_0.pdf
http://neeri.csircentral.net/432/ |
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