Evaluation of an Ultrafiltration Method for Surfactant Recovery and Reuse During In Situ Washing of Contaminated Sites: Laboratory and Field Studies |
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| Authors: | Carolina C. Ang Abdul S. Abdul |
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| Affiliation: | Carolina C. Ang;received a B.S. in chemistry from the University of Santo Tomas, Manila, Philippines, in 1964. She has been a member of the Environmental Science Department in General Motors Research Laboratories (Warren, MI 48090–9005) since 1973. She has extensive experience in analytic and atmospheric chemistry. Her research interest is in the investigation and remediation of toxic contaminants in the environment with primary interest in surfactant washing of contaminated soils and biological processes. Abdul S. Abdul;received his Ph.D. in contaminant hydrogeology from the Institute of Ground Water Research, Department of Earth Sciences, University of Waterloo, Ontario, Canada, in 1985. He has been a member of the Environmental Science Department in General Motors Research Laboratories (Warren, MI 48090–9005) since 1985;he is research manager of the Groundwater Decontamination Section. His major interests include the movement of immiscible fluids and reactive solutes through hydrogeologic materials, and the development of technologies based on physical, chemical, and biological processes to clean up contaminated soil and ground water systems. |
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| Abstract: | Feasibility studies were conducted on the use of ultrafillration to recover surfactant from aqueous waste streams generated from the in situ surfactant washing of a site contaminated with poly-chlorinated biphenyls (PCBs) and oils. A Romicon Model HF-Lab-5 ultrafiltration unit and three types of ultrafillration membranes (PM500, XM50, and CM50) were evaluated for their permeability to a nonionic surfactant previously selected for the in situ washing. Results from laboratory studies using the XM50 membrane cartridge showed that 78 percent of the surfactant passed through the membrane surface (permeate) and was recovered.
Two field-pilot tests of the ultrafiltralion system were conducted using leachate containing a mixture of water, oils, PCBs, and surfactant that was collected from an in situ surfactant-washing demonstration test. Forty-six percent of the surfactant (mass) was recovered during the first field test using the XM50 membrane. The membrane retained 94 percent of the PCBs and 89 percent of the oils. The second field test showed that the PM500 membrane recovered 67 percent of the surfactant in the permeate and retained more than 90 percent and 83 percent of the PCBs and oils, respectively. This study indicates that a significant volume of a nonionic surfactant can be recovered from leachatc mixture containing PCBs and oils by ultrafillration. The recovered surfactant could be reused to improve the economic viability of in situ surfactant washing of contaminated sites. |
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