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CHROMIUM LEACHABILITY FROM STABILIZED/SOLIDIFIED SOILS UNDER MODIFIED SEMI-DYNEMIC LEACHING CONDITIONS
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  • Journal title : Environmental Engineering Research
  • Volume 10, Issue 6,  2005, pp.294-305
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2005.10.6.294
 Title & Authors
CHROMIUM LEACHABILITY FROM STABILIZED/SOLIDIFIED SOILS UNDER MODIFIED SEMI-DYNEMIC LEACHING CONDITIONS
Moon, Deok-Hyun;
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 Abstract
The effectiveness of fly ash-, quicklime-, and quicklime-fly ash-based stabilization/solidification(S/S) in chromium(Cr) contaminated soils was investigated using modified semi-dynamic leaching tests. Artificial soil samples composed of kaolinite or montmorillonite contaminated with chromium nitrate(4000 mg of solid) were prepared and then subjected to S/S treatment using quicklime, fly ash, or quick lime-fly ash. The effectiveness of the treatment was evaluated by assessing the cumulative fraction of leached as well as, by computing the effective diffusivity () and the leachability index (LX) of the treated samples. The reduction in release for the untreated samples was more pronounced in the presence of montmorillonite, which was attributed to sorption. Treatment with quicklime, fly ash, or quick lime-fly ash was significantly effective in reducing release most probably due to the formation of pozzolanic reaction products and precipitation. The most effective treatment was observed in montmorillonite-sand soil samples treated with quicklime-fly ash (99.8% removal). The mean decreased significantly and the mean LX was greater than 9 for all treated samples, indicating that the treated soils were acceptable for "controlled utilization". The mechanism controlling leaching from all treated samples during the first 5 days appeared to be diffusion.
 Keywords
chromium (;);leachability index (LX);quicklime;semi-dynamic leaching test;stabilization/solidification (S/S);
 Language
English
 Cited by
1.
Diffusion and leachability index studies on stabilization of chromium contaminated soil using fly ash, Journal of Hazardous Materials, 2015, 297, 52  crossref(new windwow)
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