Evaluation of the optimal washing conditions for dioxin-contaminated soils from the circumference of an incinerator |
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Authors: | K Nakamiya T Furuichi K Ishii |
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Institution: | (1) Project Group of Risk Assessment and Management for Endocrine Disruptor and Dioxin-Like Compounds, National Institute for Environmental Studies, Tsukuba 305-8506, Japan Tel. +81-298-50-2913; Fax +81-298-50-2570 e-mail: Nakamiya.kunichika@nies.go.jp, JP;(2) Division of Environmental Resource Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, Japan, JP |
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Abstract: | The optimal soil-washing conditions for dioxins were estimated on a soil sample from the circumference of an incinerator
in Nose City, Osaka, Japan. The solvents ethanol, methanol, and acetone, together with a surfactant (100% of each) could extract
40% of the dioxins from contaminated soil at room temperature. From among these solvents, ethanol was chosen for a study on
how to optimize the extraction conditions because of its low toxicity and its economic advantages. The time-course of the
agitation showed that the extraction rate increased for 1 min, and thereafter the rate decreased. Therefore, the agitation
time was fixed at 1 min. To estimate the effect of temperature on the extraction rate, the extraction temperature was changed.
The amount of dioxins extracted was largest at the boiling point of ethanol (78.3°C), giving about 76% extraction. Furthermore,
at this temperature, almost 100% of the dioxins in the contaminated soil were extracted when the ratio of water to ethanol
was 20%.
Received: March 6, 2002 / Accepted: September 9, 2002 |
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Keywords: | Dioxins Extraction Soil Remediation |
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