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Stabilization of As in Soil Contaminated with Chromated Copper Arsenate (CCA) Using Calcinated Oyster Shells
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 Title & Authors
Stabilization of As in Soil Contaminated with Chromated Copper Arsenate (CCA) Using Calcinated Oyster Shells
Moon, Deok-Hyun; Cheong, Kyung-Hoon; Kim, Tae-Sung; Khim, Jee-Hyeong; Choi, Su-Bin; Moon, Ok-Ran; Ok, Yong-Sik;
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Arsenic (As) is known to be very toxic and carcinogenic to human beings. Arsenic contaminated soil was collected from a timber mill site at Busan Metropolitan City, Korea, where chromated copper arsenate (CCA) had been used to protect wood from rotting caused by insects and microbial agents. The soil was stabilized using both natural oyster shells (NOS) and calcinated oyster shells (POS). The calcination of natural oyster shells was accomplished at a high temperature in order to activate quicklime from calcite. Two different oyster shell particle sizes (-#10 mesh and -#20 mesh) and curing periods of up to 28 days were investigated. The stabilization effectiveness was evaluated based on the Korean Standard Test (KST) method (1N HCl extraction). The stabilization results showed that the POS treatment was more effective than the NOS treatment at immobilizing the As in the contaminated soils. A significant As reduction (96%) was attained upon a POS treatment at 20 wt% and passed the Korean warning standard of 20 mg/kg ('Na' area). However, an As reduction of only 47% (169 mg/kg) was achieved upon a NOS treatment at 20 wt%. The -#20 mesh oyster shells seem to perform better than the -#10 materials. The scanning electron microscopy (SEM)-energy dispersive X-ray spectroscopy (EDX) results showed that As immobilization was strongly associated with Ca and O in the presence of Al and Si.
Arsenic;Chromated copper arsenate;Oyster shells;Scanning electron microscopy;Stabilization;
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