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REMOVAL OF ISOPROPHYL ALCOHOL FROM A SURFACTANT-BASED SOIL REMEDIATION FLUID BY PERVAPORATION: PILOT SCALE FIELD DEMONSTRATION
Citation:
Alvarez*, F R., J. Springer Jr., L M. Vane*, R. Daniels, AND R Wang. REMOVAL OF ISOPROPHYL ALCOHOL FROM A SURFACTANT-BASED SOIL REMEDIATION FLUID BY PERVAPORATION: PILOT SCALE FIELD DEMONSTRATION. AIChE Spring National Meeting, Atlanta, GA, 3/5-9/2000.
Description:
The USEPA, NRMRL participated in a field demonstration of a surfactant enhanced aquifer remediation (SEAR) process. The main purpose of this field demonstration was to combine and optimize the subsurface extraction of a dense non-aqueous phase liquid with the above ground decontamination and recovery of surfactant solution components, thereby allowing for the reuse of the surfactant. The SEAR fluid contained surfactant, isopropyl alcohol (IPA), calcium chloride, and water. USEPA, NRMRL was responsible for the removal of the target DNAPL contaminant, tetrachloroethylene (PCE) from the extracted surfactant solutin using pervaporation. Peraporation is a process in which a liquid stream containing VOC's is placed in contact with one side of a non-porous polymeric membrane while vacuum or gas is applied to the other side. The components in the liquid stream sorb into the membrane, permeate through the membrane, and evaporate into the vapor phase. The vapor is then condensed. By using a membrane which is VOC selective the material on the vapor side of the membrane will contain VOCs with concentration significantly higher than those on the liquid side of the membrane.