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.

Methods, Management, Usage, Bioremediation, Surface active agents

---

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.

Research and Development in the Physical, Engineering, and Life Sciences, Water Pollution Control R&D, Organic water pollutants, Organic water pollution, Water pollution research, Decontamination (from gases, chemicals, etc.), Decontamination

---

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.

Solvents

Similar abstracts:

• Abstracts: Mineralogic constraints on the bioavailability of arsenic in smelter-impacted soils. Lead bioavailability: dissolution kinetics under simulated gastric conditions
• Abstracts: Peroxyacyl nitrates at Southern California mountain forest locations. Atmospheric oxidation of selected terpenes and related carbonyls: gas-phase carbonyl products
• Abstracts: Interlaboratory evaluation of the breakup of asbestos-containing dust particles by ultrasonic agitation. Effect of indirect sample preparation procedures on the apparent concentration of asbestos in settled dusts
• Abstracts: The daunting challenge of keeping HIV suppressed. Exploiting the HIV-chemokine nexus. Researchers air alternative views on how HIV kills cells
• Abstracts: Heavy weather ahead for clinical research. Lobbyists seek to reslice NIH's pie. NIH launches the final push to sequence the genome

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.