Econ. Environ. Geol. 2008; 41(2): 201-210

Published online April 30, 2008

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Lime (CaO) and Limestone (CaCO3) Treatment as the Stabilization Process for Contaminated Farmland Soil around Abandoned Mine, Korea

Minhee Lee1*, Yesun Lee1, Minjune Yang1, Jongseung Kim1 and Sookyn Wang2

1Department of Environmental Geosciences, Pukyong National University, 599-1 Daeyondong, Namgu, Busan 608-737, Korea
2Department of Environmental Exploration Engineering, Pukyong National University, 599-1 Daeyondong, Namgu, Busan 608-737, Korea

Correspondence to :

Minhee Lee

heelee@pknu.ac.kr

Received: January 31, 2008; Accepted: April 17, 2008

Abstract

<p>The mixing treatment process using lime (CaO) and limestone (CaCO3) as the immobilization amendments was applied for heavy metal contaminated farmland 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 farmland 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 μg/L within 5 months and maintained mostly below 10 μg/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 farmland 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

Article

Econ. Environ. Geol. 2008; 41(2): 201-210

Published online April 30, 2008

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Lime (CaO) and Limestone (CaCO3) Treatment as the Stabilization Process for Contaminated Farmland Soil around Abandoned Mine, Korea

Minhee Lee1*, Yesun Lee1, Minjune Yang1, Jongseung Kim1 and Sookyn Wang2

1Department of Environmental Geosciences, Pukyong National University, 599-1 Daeyondong, Namgu, Busan 608-737, Korea
2Department of Environmental Exploration Engineering, Pukyong National University, 599-1 Daeyondong, Namgu, Busan 608-737, Korea

Correspondence to:

Minhee Lee

heelee@pknu.ac.kr

Received: January 31, 2008; Accepted: April 17, 2008

Abstract

The mixing treatment process using lime (CaO) and limestone (CaCO3) as the immobilization amendments was applied for heavy metal contaminated farmland 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 farmland 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 μg/L within 5 months and maintained mostly below 10 μg/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 farmland 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

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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