Stabilization of lead and copper contaminated firing range soil using calcined oyster shells and fly ash

被引:0
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作者
Deok Hyun Moon
Jae-Woo Park
Kyung Hoon Cheong
Seunghun Hyun
Agamemnon Koutsospyros
Jeong-Hun Park
Yong Sik Ok
机构
[1] Chosun University,Department of Environmental Engineering
[2] Hanyang University,Department of Civil and Environmental Engineering
[3] Korea University,Division of Environmental Science and Ecological Engineering
[4] University of New Haven,Mechanical, Civil and Environmental Engineering
[5] Chonnam National University,Department of Environmental Engineering
[6] Kangwon National University,Department of Biological Environment
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关键词
Lead; Copper; Stabilization; Oyster shell; Fly ash;
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摘要
A stabilization/solidification treatment scheme was devised to stabilize Pb and Cu contaminated soil from a firing range using renewable waste resources as additives, namely waste oyster shells (WOS) and fly ash (FA). The WOS, serving as the primary stabilizing agent, was pre-treated at a high temperature to activate quicklime from calcite. Class C FA was used as a secondary additive along with the calcined oyster shells (COS). The effectiveness of the treatment was evaluated by means of the toxicity characteristic leaching procedure (TCLP) and the 0.1 M HCl extraction tests following a curing period of 28 days. The combined treatment with 10 wt% COS and 5 wt% FA cause a significant reduction in Pb (>98 %) and Cu (>96 %) leachability which was indicated by the results from both extraction tests (TCLP and 0.1 M HCl). Scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDX) analyses are used to investigate the mechanism responsible for Pb and Cu stabilization. SEM–EDX results indicate that effective Pb and Cu immobilization using the combined COS–FA treatment is most probably associated with ettringite and pozzolanic reaction products. The treatment results suggest that the combined COS–FA treatment is a cost effective method for the stabilization of firing range soil.
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页码:705 / 714
页数:9
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