Experimental study on electrokinetic remediation of in-situ Cd contaminated soil by applied voltage

Remediation of cadmium contaminated soil using modified activated carbon fiber combined with electrodynamic remediation technologyZHOU Dao-lin，CHENG Yue, WAN Yu-shan*

“…In heavy-metal contaminated soil remediation technology, electrokinetic remediation (EKR), by way of an in situ remediation measure, is to install electrodes on both sides of the soil, followed by the application of low intensity direct current to excite the desorption of heavy metals and other pollutants in the soil matrix, and move towards the electrode for removal [16][17][18][19] . Numerous efforts have been made to boost and mend the effectiveness of EKR [20] by many researchers to date, including controlling changes in soil pH [21][22][23][24] , increasing the solubility of heavy metals [25][26][27][28] , and bonding EKR with other techniques [29][30][31] .Different kinds of studies have a rmed that the removal rate of Cd during EKR rises with the increase of the impressed voltage gradient, and Cd assembles near the cathode on account of the increase of pH [32][33][34] .Diverse discusses have indicated that the existence of citric acid can boost the distillation productivity of metals such as Cd and Cr [35,36] Electrokinetic remediation technology utilizes electrodynamic remediation devices to make pollutants migrate to the soil in a directional manner, and places adsorbents in the negative, anode chamber and even the soil to adsorb metal ions desorbed from the soil surface, so as to improve the remediation e ciency [37] . V Baskaran et al [38] further improved the removal e ciency of copper by introducing adsorbent zones into the soil unit in the electrokinetic remediation process.…”