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Solvent extraction for separating micellar-solubilized contaminants and anionic surfactants
H Cheng1, D A Sabatini, T C Kibbey
1School of Civil Engineering and Environmental Science, University of Oklahoma, Norman, Oklahoma 73019-0631, USA.
Environmental Science & Technology
|August 2, 2001
Summary
Solvent extraction effectively removes contaminants from surfactant solutions used in aquifer remediation. Optimizing solvent properties and extraction conditions is key for efficient contaminant removal.
Area of Science:
- Environmental Science
- Chemical Engineering
- Water Treatment
Background:
- Surfactant-enhanced aquifer remediation (SEAR) requires effective decontamination of surfactant solutions.
- Micellar-solubilized contaminants with low equivalent alkyl carbon numbers (EACNs) present unique removal challenges.
Purpose of the Study:
- To investigate solvent extraction for removing low-EACN contaminants from surfactant solutions.
- To develop a model quantifying factors affecting solvent extraction efficiency in SEAR.
Main Methods:
- Studied solvent extraction of micellar-solubilized contaminants.
- Investigated effects of surfactant concentration, salinity, solvent solubilization, and solvent/solution ratio.
- Developed and validated a predictive model for contaminant removal.
Main Results:
- Solvent EACN higher than contaminant EACN is crucial for efficient removal.
- High surfactant concentration or salinity increases contaminant solubilization but decreases extraction efficiency.
- Continuous, low-loading, multistage column extraction improves efficiency and minimizes solvent use.
Conclusions:
- Solvent selection requires balancing EACN with physical properties like molecular weight and viscosity.
- Extraction process parameters significantly influence contaminant removal efficiency in SEAR.
- Optimized solvent extraction is vital for the successful implementation of SEAR technologies.