Influence Factors of Electrokinetic Remediation for Nitrate-polluted Kaolin

The experimental study was conducted on electrokinetic remediation for nitrate- polluted kaolin. The effects of pH, operating time and applied voltage on removal efficiency were mainly studied. The initial concentration of nitrate nitrogen in kaolin was 1 000 mg/kg. The results show that the removal efficiency can be improved with the increase of operating time and applied current. The electric energy consumption will increase as the operating time and applied current increase. Comprehensively considering the removal efficiencies and electric energy consumptions, the optimal operating time and applied voltage for the studied soils are 4 days and 0.7-1.0 V/cm respectively. When the operating time and applied voltage are 4 days and 1.0 V/cm respectively, the soil nitrate nitrogen removal rate is 87.67% and the power consumption is 335.2 kW·h/g.