Abstract
Electrokinetic treatment is a remediation technique for fine-grained soils. The feasibility and efficiency of transporting cadmium with this treatment are investigated at pilot scale in a 3.25 t clayey medium specimen spiked with cadmium nitrate solution and at an electrode spacing of 100 cm. Sulfuric acid is added to catholyte to neutralize the hydroxides generated at the cathode. A constant current density of 0.3 mA-cm −2 is applied. The test is conducted with cadmium at a concentration of 882 mg·kg −1 of dried matter. Cadmium was transported toward the catholyte and plated on the cathode. After 3 259 h of processing and an energy expenditure of 159 kWh·m −3, 98.5 % of the cadmium was removed.
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