Experimental determination of hydrodynamic dispersion coefficients for heavy metals using compacted clay


Camur M., Yazicigil H.

International Symposium on Impact of Human Activity on Groundwater Dynamics, Maastricht, Netherlands, 18 - 27 July 2001, pp.283-286 identifier

  • Publication Type: Conference Paper / Full Text
  • City: Maastricht
  • Country: Netherlands
  • Page Numbers: pp.283-286

Abstract

Mass transport of ions through the Ankara clay liner, which was prepared under three different compaction conditions, was studied experimentally on the basis of sorption, advection and hydrodynamic dispersion processes. Under optimum compaction conditions, effective porosity and hydraulic conductivity of the material were 0.32 and 0. 13-0.26 x 10(-8) cm s(-1), respectively. Effective diffusion coefficients of Cd, Cl, Cr, Cu, Fe, K, Mg, Mn, Ni, Pb and Zn ions were, respectively, 2.54, 9.51, 2.22, 2.85, 2.22, 7.93. 2.54, 3.08, 1.59, 3.17 and 2.54 (x 10(-6)) cm(2) s(-1). Two materials, prepared using half of the optimum water content but optimum energy conditions (II), and optimum water content but half of the optimum energy conditions (HI), have effective porosities of 0.35 and 0.40, respectively. Hydraulic conductivities of these materials were 3.1-4.38 x 10(-8) cm s(-1) and 916-1057 x 10(-8) cm s(-1). Dispersivities were 0.96 cm and 2.0 cm in materials II and III, respectively.