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Clays and Clay Minerals

, Volume 58, Issue 3, pp 351–363 | Cite as

Diffusion of Calcium Chloride in a Modified Bentonite: Impact on Osmotic Efficiency and Hydraulic Conductivity

  • Francesco MazzieriEmail author
  • Gemmina Di Emidio
  • Peter O. Van Impe
Article

Abstract

Chemically modified bentonites are being developed with the aim of preserving low hydraulic conductivity in the presence of potentially aggressive permeants in pollutant-containment applications. ‘Multiswellable’ bentonite (MSB) has been obtained by treating standard sodium bentonite with propylene carbonate. Research on the engineering properties of MSB has focused mainly on permeability and chemical compatibility. Solute diffusion and membrane behavior in MSB have not yet been investigated. A combined chemico-osmotic/diffusion test was performed on a MSB specimen using a 5 mM CaCl2 solution. Permeability with distilled water and with the 5 mM CaCl2 solution was measured prior to and after the chemico-osmotic/diffusion tests. The material exhibited time-dependent membrane behavior with a peak osmotic efficiency value (ω) of 0.172 that gradually shifted to zero upon breakthrough of calcium ions. Effective diffusion coefficients of calcium and chloride ions were in the range commonly described for untreated bentonite at similar porosities. After the chemico-osmotic/diffusion stage and permeation with 5 mM CaCl2, the hydraulic conductivity of MSB increased from 1.1 × 10−11 m/s to 7.0 × 10−11 m/s. The MSB was apparently converted into a calcium-exchanged bentonite at the end of the test. Prehydration and subsequent permeation might have contributed to elution of the organic additive from the clay. Further investigation is recommended to clarify the effect of prehydration on the hydraulic performance of MSB in the presence of potentially aggressive permeants.

Key Words

Chemico-osmotic Efficiency Contaminant-resistant Diffusion Hydraulic Conductivity Membrane ‘Multiswellable’ Bentonite Propylene Carbonate Swelling 

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References

  1. Ashmawy, A.K., El-Hajji, D., Sotelo, N., and Naim, M. (2002) Hydraulic performance of polymer-treated bentonite in inorganic landfill leachates. Clays and Clay Minerals, 50, 546–553.CrossRefGoogle Scholar
  2. Aylmore, L.A.G. and Quirk, J.P. (1971) Domains and quasicrystalline regions in clay systems. Soil Science Society of America Journal, 35, 652–654.CrossRefGoogle Scholar
  3. Bolt, G.H. (1956) Physico-chemical analysis of the compressibility of pure clays. Geotechnique, 6, 86–93.CrossRefGoogle Scholar
  4. Bouazza, A. (2002) Geosynthetic Clay Liners. Geotextiles and Geomembranes, 20, 3–17.CrossRefGoogle Scholar
  5. Bresler, E. (1973) Anion exclusion and coupling effects in nonsteady transport through unsaturated soil: I. Theory. Soil Science Society of America Journal, 37, 663–669.CrossRefGoogle Scholar
  6. Crank, J. (1975) The Mathematics of Diffusion (2nd edition). Clarendon Press, Oxford, UK, 414 pp.Google Scholar
  7. Egloffstein, T.A. (2001) Natural bentonites: influence of the ion exchange and partial desiccation on permeability and self-healing capacity of bentonites used in GCLs. Geotextiles and Geomembranes, 19, 427–444.CrossRefGoogle Scholar
  8. Fritz, J. (1986) Ideality of clay membranes in osmotic processes: A review. Clays and Clay Minerals, 34, 214–223.CrossRefGoogle Scholar
  9. Guyonnet, D., Gaucher, E., Gaboriau, H., Pons, C.-H., Norotte, V., and Didier, G. (2005) Geosynthetic clay liner interaction with leachate: correlation between permeability, microstructure, and surface chemistry. Journal of Geotechnical and Geoenvironmental Engineering, 131, 740–749.CrossRefGoogle Scholar
  10. Jo, H.Y., Katsumi, T., Benson, C.H., and Edil, T.B. (2001) Hydraulic conductivity and swelling of non-prehydrated GCLs permeated with single species salt solutions. Journal of Geotechnical and Geoenvironmental Engineering, 127, 557–567.CrossRefGoogle Scholar
  11. Jo, H.Y., Katsumi, T., Benson, C.H., and Edil, T.B. (2004) Hydraulic conductivity and cation exchange in non-prehydrated and pre-hydrated bentonite permeated with weak inorganic solutions. Clays and Clay Minerals, 52, 661–679.CrossRefGoogle Scholar
  12. Jugnickel, C., Smith, D., and Fityus, S. (2004) Coupled multi-ion electrodiffusion analysis for clay soil. Canadian Geotechnical Journal, 41, 287–298.CrossRefGoogle Scholar
  13. Katchalsky A. and Curran, P.F. (1965) Nonequilibrium Thermodynamics in Biophysics. Harvard University Press, Cambridge, Massachusetts, USA, 248 pp..CrossRefGoogle Scholar
  14. Katsumi, T., Onikata, M., Hasegawa, S., Lin, L., Kondo, M., and Kamon, M. (2001) Chemical compatibility of modified bentonite permeated with inorganic solutions. Pp. 419–424 in: Geoenvironmental Engineering, Geoenvironmental Impact Management (R.N. Yong and H.R. Thomas, editors). Thomas Telford, London.Google Scholar
  15. Katsumi, T., Ishimori, H., Onikata, M., and Fukagawa, R. (2008) Long-term barrier performance of modified bentonite materials against sodium and calcium permeant solutions. Geotextiles and Geomembranes, 26, 14–30.CrossRefGoogle Scholar
  16. Kolstad, D.C., Benson, C.H., Edil, T.B., and Jo, H.Y. (2004) Hydraulic conductivity of a dense prehydrated GCL permeated with aggressive inorganic solutions, Geosynthetics International, 11, 233–241.CrossRefGoogle Scholar
  17. Laird, D.A. (2006) Influence of layer charge on swelling of smectites. Applied Clay Science, 34, 74–87.CrossRefGoogle Scholar
  18. Malusis M. and Shackelford, C.D. (2001) Chemico-osmotic efficiency of a geosynthetic clay liner. Journal of Geotechnical and Geoenvironmental Engineering, 128, 97–106.CrossRefGoogle Scholar
  19. Malusis, M. and Shackelford, C.D. (2002) Theory for reactive solute transport through clay membrane barriers. Journal of Contaminant Hydrology, 59, 291–316.CrossRefGoogle Scholar
  20. Malusis, M.A., Shackelford, C.D. and Olsen, H.W. (2001) A laboratory apparatus to measure the chemico-osmotic efficiency for clay soils. Geotechnical Testing Journal, 24, 229–242.CrossRefGoogle Scholar
  21. Manassero, M. and Dominijanni, A. (2003) Modelling the osmosis effect on solute migration through porous media. Géotechnique, 53, 481–492.CrossRefGoogle Scholar
  22. Mazzieri, F. and Pasqualini, E. (2006) Evaluating the permeability of an organically modified bentonite to natural seawater. Pp. 749–756 in: Proceedings of the IVth International Conference on Environmental Geotechnics, Cardiff (H.R. Thomas, editor). Thomas Telford, Surrey, UK.Google Scholar
  23. Mazzieri, F., Van Impe, P.O., Van Impe, W.F., and Constales, D. (2003) Measurement of chemico-osmotic parameters of clayey soils. Proceedings XIIIth European Conference ISSMGE, Prague (I. Vaniceck et al., editors). Czech Geotechnical Society CICE, pp. 433–438.Google Scholar
  24. Mesri, G. and Olson, R.E. (1971) Mechanisms controlling the permeability of clays. Clays and Clay Minerals, 19, 151–158.CrossRefGoogle Scholar
  25. Mitchell, J.K. (1993) Fundamentals of Soil Behavior (2nd edition). Wiley, New York, 437 pp.Google Scholar
  26. Mishra, A.K., Ohtsubo, M., Li, L., and Higashi, T. (2006) Effect of salt concentrations on the hydraulic conductivity of the mixtures of basalt soil and various bentonites. Journal of Agricultural Faculty, Kyushu University, Japan, 51, 37–43.Google Scholar
  27. Norrish, K. and Quirk, J.P. (1954) Crystalline swelling of montmorillonite. Use of electrolytes to control swelling. Nature, 173, 255–256.CrossRefGoogle Scholar
  28. Onikata M., Kondo M., and Kamon, M. (1996) Development and characterization of a multiswellable bentonite. Proceedings of the 2nd International Conference on Environmental Geotechnics (M. Kamon, editor). Balkema, Rotterdam, pp. 587–590.Google Scholar
  29. Onikata, M., Kondo, M., Hayashi, N., and Yamanaka, S. (1999) Complex formation of cation-exchanged montmorillonites with propylene carbonate: Osmotic swelling in aqueous electrolyte solutions. Clays and Clay Minerals, 47, 672–677.CrossRefGoogle Scholar
  30. Onikata M., Fujita K., Kondo M., and Yamanaka, S. (2000) Complex formation of homoionic montmorillonite with propylene carbonate and osmotic swelling in aqueous electrolyte solutions. Molecular Crystals and Liquid Crystals, 341, 345–350.CrossRefGoogle Scholar
  31. Pusch, R. and Weston, R. (2003) Microstructural stability controls the hydraulic conductivity of smectitic buffer clay. Applied Clay Science, 23, 35–41.CrossRefGoogle Scholar
  32. Quirk, J.P. and Marčelja, S. (1997) Application of doublelayers theories to extensive crystalline swelling of Limontmorillonite. Langmuir, 13, 6241–6248.CrossRefGoogle Scholar
  33. Rhoades, J.D. (1996) Salinity: electrical conductivity and total dissolved solids. Pp. 417–435 in: Method of Soil Analysis Part 3 (D.L. Sparks, editor). Soil Science Society of America, Madison, Wisconsin, USA.Google Scholar
  34. Shackelford, C.D. (2005) Environmental issues in geoenvironmental engineering. Proceedings XVIth International Conference ISSMGE, Osaka. Millpress, The Netherlands, pp. 95–122.Google Scholar
  35. Shackelford, C.D. and Daniel, D.E. (1991) Diffusion in saturated soils, I: Background. Journal of Geotechnical Engineering, 117, 467–484.CrossRefGoogle Scholar
  36. Shackelford, C.D. and Lee, J. (2003) The destructive role of diffusion on clay membrane behavior. Clays and Clay Minerals, 51, 186–196.CrossRefGoogle Scholar
  37. Shackelford, C.D. and Malusis, M.A. (2002) Clay membrane behavior and coupled solute diffusion. Pp. 289–297 in: Chemo-Mechanical Coupling in Clays; from a Nano-Scale to Engineering Applications (C. Di Maio et al., editors). Swets & Zeitliger Publishers, The Netherlands.Google Scholar
  38. Shackelford, C.D., Benson, C.H., Katsumi, T., Edil, T.B., and Lin, L. (2000) Evaluating the hydraulic conductivity of GCLs permeated with nonstandard liquids. Geotextiles and Geomembranes, 18, 133–161.CrossRefGoogle Scholar
  39. Sumner, M.E. and Miller, W.P. (1996) Cation exchange capacity and exchange coefficients. Pp. 1201–1229 in: Methods of Soil Analysis Part 3 (D.L. Sparks, editor). Soil Science Society of America, Madison, Wisconsin, USA.Google Scholar
  40. Van Impe, P.O., Van Impe, W.F., and Mazzieri, F. (2005) Impact of osmotic efficiency on contaminant transport parameters. Proceedings XVIth International Conference ISSMGE, Osaka. Millpress, The Netherlands, pp. 2343–2346.Google Scholar
  41. Viani, B.V., Low, P.F., and Roth, C.B. (1983) Direct measurement of the relation between interlayer force and interlayer distance in the swelling of montmorillonite. Journal of Colloid and Interface Science, 96, 229–244.CrossRefGoogle Scholar
  42. Whitworth, T.M. and Fritz, S.J. (1994) Electrolyte-induced solute permeability effects in compacted smectite membranes. Applied Geochemistry, 9, 533–546.CrossRefGoogle Scholar

Copyright information

© The Clay Minerals Society 2010

Authors and Affiliations

  • Francesco Mazzieri
    • 1
    Email author
  • Gemmina Di Emidio
    • 2
  • Peter O. Van Impe
    • 2
  1. 1.Department of FIMETUniversità Politecnica delle MarcheAnconaItaly
  2. 2.Laboratory of GeotechnicsGhent UniversityZwijnaardeBelgium

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