Effects of compaction parameters on heavy metal mass transport in Ankara clay liner: Experimental approach

Mass transports of Cl, Cd, Cr, Cu, Fe, K, Mn, Ni, Pb and Zn ions through the Ankara clay liner prepared under two different compaction were studied experimentally on the bases of sorption and hydrodynamic dispersion processes. According to geotechnical tests, the Ankara clay material is highly plastic, inorganic clay having a liquid limit of 73, a plastic limit of 29 and a plasticity index of 44. Optimum compaction of the material requires 32% water content and 1.413 g/cm(3) dry density. Two materials, prepared using half of the optimum water content but optimum energy conditions (1) and optimum water content but half of the optimum energy conditions (11), have the effective porosities of 0.35 and 0.40, respectively. Hydraulic conductivities of these materials (I and 11) were 3.1-4.38x10(-8) cm/s and 916-1057x10(-8) cm/s, respectively. Dispersivities determined through column experiments were 0.88 cm and 1.78 cm in materials I and II, respectively. Mass transports of the ions were minimum in the material that were prepared using optimum conditions (diffusion dominant mass transfer) but maximum in the material that were prepared using optimum water content but half of the optimum energy conditions (advection dominant over diffusion type of mass transfer). The Ankara clay material is suitable for a liner design in waste disposal sites as long as it is compacted under optimum energy conditions.


Laboratory determination of multicomponent effective diffusion coefficients for heavy metals in a compacted clay
Çamur, Mehmet Zeki; Yazıcıgil, Hasan (2005-01-01)
Diffusion and sorption of heavy-metal ions (Cd, Cr, Cu, Fe, K, Mn, Ni, Plb, and Zn) through an Ankara clay liner were studied experimentally. The Ankara clay consists of calcite, quartz, smectite and illite, and is a highly plastic inorganic clay with optimum weight water content of 32% and corresponding dry density of 1.413 g/cm(3). U nder optimum compaction conditions, effective porosity (volumetric water content) and hydraulic conductivity in the material were determined as 0.45 and 1.3 to 2.6x10(-9) cm/...
Experimental determination of hydrodynamic dispersion coefficients for heavy metals using compacted clay
Camur, MZ; Yazıcıgil, Hasan (2001-07-27)
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,...
KOCAK, HI; ARAS, L (Elsevier BV, 1990-07-01)
The solution behaviour of Na, Ba, Zn and Al ionomers of methyl methacrylate-methacrylic acid copolymer (P(MMA-MAA)) with different ion contents has been studied by viscosity and dipole moment measurements. Two solvents with different character are chosen for viscosity measurements: dioxane (ε = 2.22) and acetone (ε = 20.7). The expected polyelectrolyte behaviour of the ionomers in acetone is reflected by the viscometric measurements. Mean squared dipole moment 〈μ2〉 values are calculated over a temperature r...
Effects of pressure and electric field on the charge transport mechanisms in the silver-modified-zeolite porous microstructure
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The electrical properties and charge transport mechanisms for nanoporous natural zeolite of clinoptilolite and its silver modified form were studied for the first time in a wide gas pressure range (4-760 Torr) and electric field strength (50-350 kV/cm) at room temperature using two different cell configurations. One of the used cells contained a gas discharge gap, which allowed investigating the electronic conduction route in zeolite cathodes (ZC) as well. The influence of pressure, electric field and cell ...
Effect of Nb addition on the critical parameters of BSCCO superconductor
Sozeri, H.; Ghazanfari, N.; Oezkan, H.; Kılıç, Adnan; Hasanlı, Nızamı (2007-04-12)
Pure and Nb2O5 added Bi1.6Pb0.4NbxSr2Ca2Cu3O delta superconductors (0 <= x <= 0.30) were synthesized by the ammonium nitrate melt route. Fraction of the high T-c 2223 phase increases with addition of small amounts of Nb. AC susceptibility and transport measurements showed the optimum Nb concentration as x = 0.10. Nb additions above x = 0.20 decrease significantly the fraction of the high-T-c phase and degrade the superconducting properties.
Citation Formats
M. Z. Çamur and H. Yazıcıgil, “Effects of compaction parameters on heavy metal mass transport in Ankara clay liner: Experimental approach,” TURKISH JOURNAL OF EARTH SCIENCES, pp. 97–107, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/53172.