Assessment of waste oyster shells for stabilization of Pb

th
1o International Symposium on Environmental Geotechnology and Sustainable Development
Bochum 2009
Assessment of waste oyster shells for stabilization of Pb contaminated mine tailings in
Republic of Korea
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Deok Hyun Moon , Su Bin Choi , Sunbaek Bang , Jeehyeong Khim , Kyoung-Woong Kim , Dennis G. Grubb
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Abstract
In this study, Pb contaminated mine tailings in Republic of Korea were stabilized using 0 wt% to 30 wt% natural waste oyster shells
(NOS) and pretreated waste oyster shells (POS), the latter roasted at 900ºC to activate quicklime (CaO). Pb leaching from the NOS and
POS stabilized mine samples for curing times up to 28-days was evaluated using the modified Korean Standard Test (KST) method (1N
HCl extraction). The treatment with 25 wt% of POS passed the Korean warning standard of 20 mg/L (or 100 mg/kg) after 1 day of curing.
Less than 1 mg/L of Pb leached from the 30 wt% POS-stabilized mine tailings after 7 days of curing. No significant treatment results were
obtained up to 20 wt% of NOS. The best result was obtained from 30% NOS, which leached 23 mg Pb/L after 28 days of curing. The
POS treated mine tailings were also evaluated using X-ray powder diffraction (XRD) and scanning electron microscopy (SEM)-energy
dispersive X-ray (EDX) to gauge the minerals and morphology strongly associated with the Pb immobilization.
Key words: Pb; waste oyster shell; mine tailings; stabilization; modified Korean Standard Test (KST)
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Director, Institute of Environmental Technology, Keumjeong Calcore, Busan 607-838, Republic of Korea,
e-mail: [email protected]
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Lecturer, Department of Environmental Engineering, Chosun University, Gwangju 501-759, Republic of Korea
Research Associate, Keumjeong Calcore, Busan 607-838, Republic of Korea
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Research Assistant Professor, International Environmental Research Center (IERC), Gwangju Institute of
Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea
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Professor, Department of Civil, Environmental and Architectural Engineering, Korea University, 5-ga,
Anam-dong, Seongbuk-gu, Seoul 136-701, Republic of Korea
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Professor, Department of Environmental Science and Engineering, Gwangju Institute of Science and
Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea
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Senior Associate, Schnabel Engineering, LLC, 510 East Gay Street, West Chester, PA 19380, USA
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