Stabilization of arsenic-contaminated mine tailings using natural and calcined oyster shells

被引:32
|
作者
Moon, Deok Hyun [1 ,2 ]
Kim, Kyoung-Woong [3 ]
Yoon, In-Ho [3 ]
Grubb, Dennis G. [4 ]
Shin, Dae-Yewn [1 ]
Cheong, Kyung Hoon [5 ,6 ]
Choi, Hyung-Il [1 ]
Ok, Yong Sik [7 ]
Park, Jeong-Hun [8 ]
机构
[1] Chosun Univ, Dept Environm Engn, Kwangju 501759, South Korea
[2] Haechun ETS Co Ltd, Taejon, South Korea
[3] Gwangju Inst Sci & Technol GIST, Dept Environm Sci & Engn, Kwangju 500712, South Korea
[4] CETCO, Trevose, PA 19053 USA
[5] Chosun Univ, Dept Environm Engn, Kwangju 501759, South Korea
[6] Chosun Univ, Team Biohydrogen Prod BK21, Kwangju 501759, South Korea
[7] Kangwon Natl Univ, Dept Environm Biol, Chunchon 200701, South Korea
[8] Chonnam Natl Univ, Dept Environm Engn, Kwangju 500757, South Korea
关键词
Arsenic; Mine tailings; Oyster shells; Stabilization; IMMOBILIZATION MECHANISM; SOILS; SOLIDIFICATION/STABILISATION; CEMENT; WASTE;
D O I
10.1007/s12665-010-0890-y
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
收藏
页码:597 / 605
页数:9
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