Physicochemical transport processes affecting the removal of residual DNAPL by nonionic surfactant solutions
Article Abstract:
Dense nonaqueous phase liquids (DNAPLs) prevent remediation of contaminated aquifers by preventing the solubilization and mobilization of residual NAPL. A new method that increases the efficiency of NAPL removal and surfactant recovery involves the use of nonionic surfactants such as Triton X-100. The technology promotes the removal of residual NAPL by improving macroemulsion transport. Mathematic models describing the technology are included.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Evaluation of thermal effects on the dissolution of a nonaqueous phase liquid in porous media
Article Abstract:
Hot water flooding was not effective in remediating a porous medium containing the nonaqueous phase liquid (NAPL) tetrachlorethylene. The method, used at different temperatures, was found to have only a 7% effect on interfacial tension at the NAPL interface and thus a minor effect for mass transfer. However, hot water flooding could be useful if temperature increases have a significant effect on a contaminant's aqueous phase solubility.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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Cosolvent-enhanced remediation of residual dense nonaqueous phase liquids: experimental investigation
Article Abstract:
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.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1995
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