Research Article
Adsorption of Heavy Metals on Bentonitic Soil for Use in Landfill Liners
| | Property | Result |
| | Soil fractions | Coarse sand | 1.0% | | Medium sand | 7.0% | | Fine sand | 34.0% | | Silt | 43.0% | | Clay | 15.0% | | Specific gravity of the solids, Gs | 2.69 | | Liquid limit, wL | 31% | | Plasticity limit, wP | 18% | | USCS classification | SC-CL | | Activity index (Skempton) | 0.87 | | Cation exchange capacity index [54] | 1.3 | | Optimum water content, wopt | 13.4% | | Maximum dry unit weight, dmax | 19.9 kN/m3 | | Hydraulic conductivity at wopt | 4.7×10-8 m/s | | Mineralogical composition | Quartz, smectite, and feldspar | | Chemical composition | SiO2: 54.34% | | Al2O3: 23.07% | | Fe2O3: 8.57% | | K2O: 4.46% | | MgO: 2.78% | | Cation exchange capacity | 20.0 cmolc.Kg-1 | | Organic content | 1.53% | | pH | Distilled water: 8.7 | | KCl: 7.6 |
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