We have been conducting remediation of soil and groundwater contaminated by illegally dumped spent solvents in an area in northeast Japan from 2009. The site was contaminated by huge amounts of various industrial wastes and about ten organochlorine compounds, as well as benzene, were major pollutants. Dichloromethane and tri-/tetra-chloroethylene were found in high concentrations (from several to several tens of milligrams per liter) in water eluted from the soil. Because the soil was deeply contaminated and the ground had very low permeability, different remediation measures were applied to the unsaturated and saturated zones. Agitation mixing of quicklime was adopted for the unsaturated zone. For the saturated zone, pumping and aeration were adopted in addition to bioremediation for long-term purification. We succeeded in this pollution purification for the most part. However, we have been facing the contamination of 1,4-dioxane in these two years and measures have been got to the contaminant. In this study, the experience of on-site remediation that used several treatment measures and the current status in this remediation site are shown.

On-site soil remediation experience in a large contaminated site by various solvents caused by illegal dumping of wastes

253rd National Meeting (2017)

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