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http://dx.doi.org/10.9719/EEG.2012.45.3.255

Investigation of the Rice Plant Transfer and the Leaching Characteristics of Copper and Lead for the Stabilization Process with a Pilot Scale Test  

Lee, Ha-Jung (Department of Environmental Geosciences, Pukyong National University)
Lee, Min-Hee (Department of Environmental Geosciences, Pukyong National University)
Publication Information
Economic and Environmental Geology / v.45, no.3, 2012 , pp. 255-264 More about this Journal
Abstract
The stabilization using limestone ($CaCO_3$) and steel making slag as the immobilization amendments for Cu and Pb contaminated farmland soils was investigated by batch tests, continuous column experiments and the pilot scale feasibility study with 4 testing grounds at the contaminated site. From the results of batch experiment, the amendment with the mixture of 3% of limestone and 2% of steel making slag reduced more than 85% of Cu and Pb compared with the soil without amendment. The acryl column (1 m in length and 15 cm in diameter) equipped with valves, tubes and a sprinkler was used for the continuous column experiments. Without the amendment, the Pb concentration of the leachate from the column maintained higher than 0.1 mg/L (groundwater tolerance limit). However, the amendment with 3% limestone and 2% steel making slag reduced more than 60% of Pb leaching concentration within 1 year and the Pb concentration of leachate maintained below 0.04 mg/L. For the testing ground without the amendment, the Pb and Cu concentrations of soil water after 60 days incubation were 0.38 mg/L and 0.69 mg/l, respectively, suggesting that the continuous leaching of Cu and Pb may occur from the site. For the testing ground amended with mixture of 3% of limestone + 2% of steel making slag, no water soluble Pb and Cu were detected after 20 days incubation. For all testing grounds, the ratio of Pb and Cu transfer to plant showed as following: root > leaves(including stem) > rice grain. The amendment with limestone and steel making slag reduced more than 75% Pb and Cu transfer to plant comparing with no amendment. The results of this study showed that the amendment with mixture of limestone and steel making slag decreases not only the leaching of heavy metals but also the plant transfer from the soil.
Keywords
steel making slag; limestone; plant transfer; heavy metal stabilization; soil contamination;
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Times Cited By KSCI : 5  (Citation Analysis)
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