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A Study of Heavy Metal-Contaminated Soil Remediation with a EDTA and Boric acid Composite(II): Cd and Cr  

Lee Jong-Yeol (Beautiful Environmental Construction Co. Ltd.)
Kim Yong-Soo (ERM KOREA LIMITED)
Kwon Young-Ho (Halla Engineering & Construction Corp.)
Kong Sung-Ho (Department of Chemical Engineering, Hanyang University)
Park Shin-Young (Halla Engineering & Construction Corp.)
Lee Chang-Hwan (Halla Engineering & Construction Corp.)
Sung Hae-Ryun (Department of Chemical Engineering, Hanyang University)
Publication Information
Journal of Soil and Groundwater Environment / v.9, no.4, 2004 , pp. 8-14 More about this Journal
Abstract
To investigate the optimal operation factors in appling Soil Flushing Process, which use EDTA and boric acid composite as a flushing reagent, to the Cd(cadmium) and Cr(chromium) contaminated sites, Cd and Cr emediation rate was investigated at various experimental conditions; as EDTA concentration was increased from 0.001M to 0.1M, Cd remediation rate was increased from $73.2\%\;to\;98.5\%$; as boric acid concentration was increased from 0.001M to 0.1M, Cr remediation rate was increased from $59.2\%\;to\;99.0\%$. In the experiments using 0.005M of EDTA and 0.005M of boric acid composite as a flushing reagent at different pH regimes, Cd remediation rate was decreased from $92.4\%\;to;80.9\%$ as the pH was increased from 3 to 7. But Cr remediation rate was more effective ($70.4\%$) at pH 5 compared to the other pHs. Furthermore, at pH 5, Cd and Cr remediation rate was investigated at different molecular ratio of [EDTA]/[Boric aicd]; the optimized [EDTA]/[Boric acid] ratio was 0.01M/0.1M for Cd contaminated site and, as the concentration of boric acid was increased over 0.1M, Cr remediation rate was also increased. So the similar results were shown in the experiments using real contaminated soils which were sampled from a mining and a industrial area.
Keywords
Chromium; Cadmium; EDTA; Boric acid; Soil flushing;
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  • Reference
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