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KMID : 1024520010100040299
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Journal of the Environmental Sciences
2001 Volume.10 No. 4 p.299 ~ p.304
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Remediation of Contaminated Soil with Heavy Metal Using Low Molecular Weight Organic Acids
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Jeong Euh-Duck
Won Mi-Sook
Yoon Jang-Hee
Lee Byung-Ho
Paek U-Hyon
Gardella Joseph A. Jr
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Abstract
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For the remediation of the contaminated soil with heavy metals, Cd, Cr, Cu, and Pb, the reaction parameters were optimized. Tartaric acid (TA) and oxalic acid(OA) as a washing agent and recovery of metals, The optimum washing conditions of TA and OA were in the ratio of 1 : 20 between soil and acid solution during 2hr reaction under unbuffered pH solutions. At the optimized reaction conditions, the removal efficiencies were compared with that of 0.1 M HCl and ethylenediamine tetraacetic acid(EDTA). TA showed higher efficiency on the removal of Pb than that of EDTA, which established for the remediation of contaminated soil with Pb and Cd metals. The recovery of metal ions from washing solution was achieved by adding calcium hydroxide and sodium sulfide by forming the precipitation of metal hydroxide and metal slfied. Optimum amounts of sodium sulgide and calcium hydroxide were Cd = 25g/, Cu = 5~10g/ and Pb = 5~10g/ for the washing solution of OA and 2~5g/ for the washing solution of TA, respectively. The amounts of and for the tartaric acid was less than that of oxalic acid.
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KEYWORD
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Contaminated soil, remediation, washing solution, tartaric acid, oxalic acid
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