Geosciences Journal

, 8:85

Electroosmosis and pore pressure development characteristics in lead contaminated soil during electrokinetic remediation

Article

Abstract

Physical and chemical reactions occur during the electrokinetic treatment. When an electric current was applied to soil for some duration, fluid transport phenomena occurred in the soil-water system and the characteristics of soil-water interface varied according to the pH levels due to electrolysis. In addition, reactions occurring within the electrokinetic system are changed according to the inter-reactions of the clay property and electrohydraulic conductivity. In this study, the hydraulic phenomena and the variations of its properties were investigated during the electrokinetic remediation treatment of lead contaminated soil. To do this, laboratory testing on the lead-contaminated soil was performed and the pH distribution, electroosmotic flow, and pore pressure were measured. The zeta potential, with respect to contaminant concentration and pH level, was also investigated through the analysis of the physicochemical relationships. The flow velocity of the electroosmosis was found to be sensitive to the chemical characteristics of the clay and contaminant concentration. As the concentration of lead increased, the flow rate decreased and negative pore pressure occurrs near the cathode due to the differences in flow rates between the electrodes. This negative pore water pressure was proportionate to the flow rate, i.e., a larger flow rate developed a larger negative pore water pressure.

Key words

electrokinetic remediation zeta potential electroosmosis negative pore water pressure 

References

  1. Acar, Y.B. and Alshawabkeh, A.N., 1993, Principles of electrokinetic remediation. Environmental Science and Technology, 27, 2638–2647.CrossRefGoogle Scholar
  2. Acar, Y.B., Alshawabkeh, A.N. and Gale, R.J., 1992, A review of fundamentals of removing contaminants from soils by electrokinetic soil processing. Environmental Geotechnology, Proceedings of the Mediterranean Conference on Environmental Geotechnology, Cesme, Turkey, May 25–27, p. 321–330.Google Scholar
  3. Acar, Y.B., Rabbi, M.F. and Ozsu, E.E., 1997, Electrokinetic injection of ammonium and sulfate ions into sand and kaolinite beds. Journal of Geotechnical and Geoenvironmental Engineering, 123, 239–249.CrossRefGoogle Scholar
  4. Alshawabkeh, A.N. and Acar, Y.B., 1992, Removal of contaminants from soil by electrokinetics: A theoretical treatise. Journal of Environmental Science and Health, A27, 1835–1861.Google Scholar
  5. Alshawabkeh, A.N., Yeung, A.T. and Bricka, M.R., 1999, Practical aspects of in situ electrokinetic extraction. Journal of Environmental Engineering, 125, 27–35.CrossRefGoogle Scholar
  6. Bruell, C., Segal, B. and Walsh, H., 1992, Electro-osmotic removal of gasoline hydrocarbons and TCE from clay. Journal of Environmental Engineering, 118, 68–83.CrossRefGoogle Scholar
  7. Elektorowicz, M. and Boeva, V., 1996, Electrokinetic supply of nutrients in soil bioremediation. Environmental Technology, 17, 1333–1349.Google Scholar
  8. Eykholt, G.R. and Daniel, D.E., 1994, Impact of system chemistry on electroosmosis in contaminated soil. Journal of Geotechnical Engineering, 120, 797–815.CrossRefGoogle Scholar
  9. Fleureau, J.M. and Kheirbek-Saoud, S., 1996, Depollution of oil contaminated soil by electro injection. Environmental Geotechnics, Proceedings of The Second International Congress on Environmental Geotechnics, Osaka, Japan, February 5–8, p. 999–1004.Google Scholar
  10. Hamed, J., Acar, Y.B. and Gale, R.J., 1991, Pb(II) removal from kaolinite by electrokinetics. Journal of Geotechnical Engineering, 117, 240–271.CrossRefGoogle Scholar
  11. Hunter, R.J., 1981, Zeta potential in colloid science. Academic Press, New York, 386p.Google Scholar
  12. Hussain, S.A., 1996, Zeta potential measurements on three clays from Turkey and effects of clays on coal flotation. Journal of Colloid and Interface Science, 184, 535–541.CrossRefGoogle Scholar
  13. Lageman, R., Pool, W. and Seffinga, G.A., 1989, Electro-reclamation in theory and practice. Forum on Innovative Hazardous Waste Treatment Technologies, U.S. EPA, Report 540/2-89/056, p. 57–76.Google Scholar
  14. Mitchell, J.K., 1993, Fundamental of soil behavior. 2nd edition, John Wiley Sons, Inc., New York, p. 340–370.Google Scholar
  15. Penn, M., Savvidou, C. and Hellawell, E.E., 1996, Centrifuge modelling of the removal of heavy metal pollutants using electrokinetics. Environmental Geotechnics, Proceedings of The Second International Congress on Environmental Geotechnics, Osaka, Japan February 5–8, p. 1055–1060.Google Scholar
  16. Riddick, T.M., 1984, Control of colloid stability through zeta potential, Zeta-Meter Inc., New York, p. 21–24.Google Scholar
  17. Rødsand, T. and Acar, Y.B., 1995, Electrokinetic extraction of lead from spiked Norwegian marine clay. Geoenvironment 2000, Geotechnical Special Publications 46, Louisiana, February 24–26, p. 1518–1563.Google Scholar
  18. Shang, J.Q., Lo, K.Y. and Quigley, R.M., 1994, Quantitative determination of potential distribution in Stern-Gouy double-layer model. Canadian Geotechnical Journal, 31, 624–636.CrossRefGoogle Scholar
  19. Shapiro, A.P. and Probstein, R.F., 1993, Removal of contaminants from saturated clay by eletro-osmosis. Environmental Science and Technology, 27, 283–291.CrossRefGoogle Scholar
  20. Stewart, D.I. and West, L.J., 1996, Electrokinetic soil decontamination-effect of local resistivity variations. Environmental Geotechnics, Proceedings of The Second International Congress on Environmental Geotechnics, Osaka, Japan, February 5–8, p. 1101–1106.Google Scholar
  21. Thevanayagam, S. and Rishindran, T., 1998, Injection of nutrient and TEAs in clayey soils using electrokinetics. Journal of Geotechnical and Geoenvironmental Engineering, 124, 330–338.CrossRefGoogle Scholar
  22. U.S. EPA., 1995, In-situ remediation technology status report, Electrokinetics. U.S. EPA, Report 542/K-94/009, 20 p.Google Scholar
  23. Williams, D.J.P. and Williams, K.P., 1978, Electrophoresis and zeta potential of kaolinite. Journal of Colloid and Interface Science 65, 79–87.CrossRefGoogle Scholar
  24. Yeung, A.T. and Datla, S., 1995, Fundamental formulation of electrokinetic extraction of contaminants from soil. Canadian Geotechnical Journal, 32, 569–583.CrossRefGoogle Scholar
  25. Yeung, A.T., Hsu, C.H. and Menon, R.M., 1996, EDTA-enhanced electrokinetic extraction of lead. Journal of Geotechnical Engineering, 122, 666–673.CrossRefGoogle Scholar
  26. Yeung, A.T. and Mitchell, J.K., 1993, Coupled fluid, electrical and chemical flows in soil. Geotechnique, 43, 121–134.CrossRefGoogle Scholar

Copyright information

© Springer 2004

Authors and Affiliations

  1. 1.The Research Institute of Engineering & TechnologyHanyang UniversityAnsanKorea
  2. 2.Department of Civil & Environmental EngineeringHanyang UniversityAnsanKorea

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