Stabilization of arsenic-contaminated mine tailings using natural and calcined oyster shells |
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| Authors: | Deok Hyun Moon Kyoung-Woong Kim In-Ho Yoon Dennis G Grubb Dae-Yewn Shin Kyung Hoon Cheong Hyung-Il Choi Yong Sik Ok Jeong-Hun Park |
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| Institution: | (1) Department of Environmental Engineering, Chosun University, Gwangju, 501-759, Republic of Korea;(2) Haechun ETS Co., Ltd, Daejeon, Republic of Korea;(3) Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 500-712, Republic of Korea;(4) CETCO, 900 Northbrook Dr., Suite 320, Trevose, PA 19053, USA;(5) Department of Environmental Engineering and BK21 Team for Biohydrogen Production, Chosun University, Gwangju, 501-759, Republic of Korea;(6) Department of Biological Environment, Kangwon National University, Chuncheon, 200-701, Republic of Korea;(7) Department of Environmental Engineering, Chonnam National University, Gwangju , 500-757, Republic of Korea |
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| Abstract: | Natural oyster shells (NOS) and calcined oyster shells (COS) were used to immobilize arsenic (As) from contaminated mine tailings.
In addition, a blend of Portland cement (PC)/cement kiln dust (CKD) was used as a stabilizing agent. The Korean Standard Test
(KST) method (1 N HCl extraction) was used to evaluate the effectiveness of the treatment. The experimental results showed
that COS effectively immobilized As in treated mine tailings. Specifically, an As concentration less than 1 mg L−1 was obtained following COS treatment at 25 and 30 wt%. However, all the samples subjected to NOS treatments failed the Korean
warning standard of 1.2 mg L−1 after 28 days of curing. All of the COS-PC treatments were successful meeting the Korean warning standard after 7 days of
curing. However, the PC-only treatment failed to meet the Korean warning standard. Similarly, the CKD-only treatment was failed
to meet the Korean warning standard after 7 days of curing. However, the COS-CKD treatment showed that when the COS content
was greater than 20 wt%, less than 1 mg L−1 of As leachability was obtained. Scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDX) showed needle-like
and torpedo-like Ca–As phases in the COS-treated samples suggesting that As was strongly associated with Ca and O. X-ray absorption
near edge structure (XANES) analyses confirmed that As(V) was prevalent in the tailings and that there were no changes in
As speciation following NOS or COS treatment. |
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