Study on recovery of transudated organic solvents to subsurface area and their spreading to lower layer by washing-reagent-injection

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The safety of washing-reagent-injection technique to remediate subsurface pollution was assessed from the migration and the chemical decomposition efficiencies. Several chlorinated organic solvents could not pass through the vacancy formed by less than 4mmΦ glass beads when the column was saturated with water, while the solvents could pass through even the vacancy formed by 0.1mmΦglass beads. Such effects by the addition of surfactants appear several ways by the different kinds and concentrations of surfactants. It is also observed that the addition of surfactants changes the decomposition reaction route for chloroethylenes; hydrogenolysis reaction which produces the toxic chloroethylenes, becomes dominant route in some case.