Cosolvent-enhanced remediation of residual dense nonaqueous phase liquids: experimental investigation

The effectiveness of cosolvents in removing dense nonaqueous phase liquids (DNAPLs) at residual saturation within porous media is evaluated. The results showed that methanol flushing caused the mobilization, non-equilibrium dissolution and flow bypassing of tetrachloroethylene. Small-scale heterogeneities can lead to high residual DNAPL saturations which lend themselves easily to mobilization.