Remediational Effect of Contaminated Groundwater with Permeable Groundwater Treatment Wall
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概要
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In order to keep contaminated groundwater by chlorinated organic compounds from flowing out to outside of the facilities, permeable treatment wall using zero-valent iron had installed in the groundwater contaminated site. Monitoring of remediational effect and prediction of durability of the treatment wall were carried out. Reactivity of iron powder is measured by batch experiments. Durability of treatment wall was predicted by the reaction model proposed by Shimomura et al. (1998) using estimated parameters from the column experiment using groundwater sampled in the field.<BR>The permeable groundwater treatment wall consists of block-style reactive zones installed in a zigzag disposition. Each reactive zone is approximately 0.6m in thickness,3.0 to 6.0m in length, and 7.0m in depth, and focuses to clean up the contaminated groundwater that passed through the first aquifer which consists of boulder gravel layer.<BR>Effectivity of remediation has been confirmed through the monitoring. Concentration of the treatment water is verified under the Environmental Quality Standards of groundwater by the results of groundwater monitoring at monitoring wells installed to up- and downgradient sides of the treatment wall.<BR>It is predicted that the durability of the treatment wall is enough to prevent from flowing out of contaminated groundwater which concentration exceeds Environmental Quality Standards of groundwater approximately for 17000 days (about 47 years), even in case that the groundwater velocity is ten times of the measured average groundwater velocity on the site. As the results of this predictive calculation, if the remediation of contaminant source will be carried out in case of scraping, enlarging, or rebuilding of the facilities in 47 years, it is possible to remediate at a low cost without disturbing the site operations.
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