Study on Permeability and Electrical Resistivity of Red Clay Contaminated by Cu2+

Abstract


 
 
 In order to study the permeability characteristics of heavy metal ions contaminated red clay and explore the rapid detection of permeability of heavy metal contaminated red clay. Through variable-head permeability test and electrical resistivity test (different voltages and methods), the effects of Cu2+ concentration and initial water content on hydraulic conductivity characteristic and resistivity of contaminated red clay was systematically investigated. The relationship between permeability characteristic and electrical resistivity was further explored by taking Cu2+ concentration and moisture content as the intermediate variable. The obtained results indicate that the different voltage has no obvious effect on the resistivity of the samples. The four-phase electrode method is more accurate than the two-phase electrode method. With increasing Cu2+ concentrations the hydraulic conductivity of specimens increases, however the permeability coefficient of contaminated soil decreases with increasing initial water content. In the resistivity test, with increasing of Cu2+ concentrations and water content, the resistivity of samples presented a downward trend, which is decreased sharply at first and then tended to be gentle. The relationship between hydraulic conductivity and resistivity of contaminated soil showed a good fitting curve no matter in different Cu2+ concentration or in different water content, but the fitting curves of them presented opposite trend.
 
 

Investigation of the Effect of Leachate on Permeability and Heavy Metal Removal in Soils Improved with Nano Additives

“…However, the properties of the clay change as a result of interactions such as cation exchange, dissolution/precipitation, and redox reactions between the clay and leachate [5]. It has been reported by many researchers that pH [6], salt solutions [7,8], organic matter [9,10], and heavy metals [9,11,12] increase the permeability of clayey liners used in landfills. The resulting increase in permeability raises great concern about the environmental fate of leachate pollutants such as heavy metals.…”