Abstract
The performance of a series-electrokinetic (EK) process in treating a clay soil artificially contaminated with 300 mg/kg trichloroethylene (TCE) was investigated. Constant voltage gradients of 1 or 2 V/cm to induce the movement of electrolyte solution in the soil were applied to the EK system for 3–5 days using synthetic groundwater as processing fluid. Results show that the values of electroosmotic permeability ranged from 3.7×10-6 to 9.1×10-6 cm2/V-s. Increasing applied voltage and prolonging processing time resulted in a better removal efficiency. With voltage gradient of 1 V/cm, TCE removal efficiency of 75.8 and 86.4% were achieved, respectively, for 3 and 5 days EK operation. It was found that nearly 100% TCE was removed in the vicinity of anode sides. When the applied voltage gradient was raised to 2 V/cm, the remaining TCE concentration in both cathode sides was effectively removed and a total removal efficiency of 91.3% was achieved. Energy requirements per unit ton of soil treated were around 12...
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