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Lime (CaO) and Limestone ($CaCO_3$) Treatment as the Stabilization Process for Contaminated Farmland Soil around Abandoned Mine, Korea  

Lee, Min-Hee (Department of Environmental Geosciences, Pukyong National University)
Lee, Ye-Sun (Department of Environmental Geosciences, Pukyong National University)
Yang, Min-Jun (Department of Environmental Geosciences, Pukyong National University)
Kim, Jong-Seung (Department of Environmental Geosciences, Pukyong National University)
Wang, Soo-Kyn (Department of Environmental Exploration Engineering, Pukyong National University)
Publication Information
Economic and Environmental Geology / v.41, no.2, 2008 , pp. 201-210 More about this Journal
Abstract
The mixing treatment process using lime (CaO) and limestone ($CaCO_3$) as the immobilization amendments was applied for heavy metal contaminated filmland soils around Goro abandoned Zn-mine, Korea in the batch and pilot scale continuous column experiments. For the batch experiments, with the addition of 0.5 wt.% commercialized lime or limestone, leaching concentrations of As, Cd, Pb, and Zn from the contaminated filmland soil decreased by 70, 77, 94, and 95 %, respectively, compared to those without amendments. For the continuous pilot scale column experiments, the acryl column (30 cm in length and 20 cm in diameter) was designed and granulated lime and limestone were used. From the results of column experiments, with only 2 wt.% of granulated lime, As, Cd, and Zn leaching concentrations decreased by 63%, 97%, and 98%, respectively. With 2 wt.% of granulated limestone, As leaching concentration reduced from 135.6 to 30.2 ${\mu}g/L$ within 5 months and maintained mostly below 10 ${\mu}g/L$, representing that more than 46% diminution of leaching concentration compared to that without the amendment mixing. For Cd and Zn, their leaching concentrations with only 2 wt.% of limestone mixing decreased by 97%, respectively compared to that without amendment mixing, suggesting that the capability of limestone to immobilize heavy metals in the filmland soil was outstanding and similar to that of lime. From the column experiments, it was investigated that if the efficiency of limestone to immobilize heavy metals from the soil was similar to that of lime, the limestone could be more available to immobilize heavy metals from the soil than lime because of low pH increase and thus less harmful side effect.
Keywords
stabilization; immobilization; lime; limestone; heavy metal contamination;
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Times Cited By KSCI : 2  (Citation Analysis)
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