Simulated formation and flow of microemulsions during surfactant flushing of contaminated soil.

Abstract

Contamination of groundwater resources by non-aqueous phase liquids (NAPLs) has become an issue of increasing environmental concern. This study investigated the formation and flow of microemulsions during surfactant flushing of NAPL-contaminated soil using the finite difference model UTCHEM, which was verified with our laboratory experimental data. Simulation results showed that surfactant flushing of NAPLs (i.e., trichloroethylene and tetrachloroethylene) from the contaminated soils was an emulsion-driven process. Formation of NAPL-in-water microemulsions facilitated the removal of NAPLs from contaminated soils. Changes in soil saturation pressure were used to monitor the mobilization and entrapment of NAPLs during surface flushing process. In general, more NAPLs were clogged in soil pores when the soil saturation pressure increased. Effects of aquifer salinity on the formation and flow of NAPL-in-water microemulsions were significant. This study suggests that the formation and flow of NAPL-in-water microemulsions through aquifer systems are complex physical-chemical phenomena that are critical to effective surfactant flushing of contaminated soils.

• Authors: Ying Ouyan, Jong Soo Cho, Robert S Mansell
• Journal: Water research (Water Res) Vol. 36 Issue 1 Pg. 33-40 (Jan 2002) ISSN: 0043-1354 [Print] England
• PMID: 11766810 (Publication Type: Journal Article)

Chemical References

• Soil Pollutants
• Surface-Active Agents
• Water Pollutants, Chemical

Topics

• Models, Theoretical
• Pressure
• Soil Pollutants (analysis)
• Solubility
• Surface-Active Agents (chemistry)
• Water Movements
• Water Pollutants, Chemical (analysis)
• Water Supply