Soil Cd pollution is a threat to the global ecological environment. Electrokinetic remediation (EKR) generally uses strong electric fields to obtain high removal efficiency, which leads to a series of side reactions and high energy consumption. EKR using low-voltage gradients showed weak migration of Cd and low remediation efficiency. Herein, to develop an effective enhanced EKR technology using low voltage gradient (0.2 V·cm⁻¹), array adsorption zone and polarity exchange were applied simultaneously. Five experiments were conducted to determine the effect of polarity exchange, array adsorption zone and their combination on Cd removal when EKR was carried out at 0.2 V·cm⁻¹. Results showed that the combined use of the array adsorption zone and polarity exchange achieved optimal remediation and average Cd removal efficiency was 83%. Moreover, the reciprocating motion of Cd caused by polarity exchange is no longer a side effect. In the wheat cultivation experiment, the Cd concentration of wheat root, stem and leaf decreased by 86%, 93% and 95% after Cd was removed by EKR coupled with array adsorption zone and polarity exchange. The 30-day energy consumption is 7.72 kWh·m⁻³, which is far lower than that of other enhancement methods. The present work proposes an effective EKR technology working at low voltage for Cd-contaminated soil.

土壤镉污染是对全球生态环境的威胁。电动修复（EKR）一般利用强电场来获得高去除效率，这会导致一系列副反应和高能耗。使用低电压梯度的 EKR 表现出 Cd 的弱迁移和低修复效率。在此，为了开发使用低电压梯度（0.2 V·cm ^-1）的有效增强型 EKR 技术，同时应用阵列吸附区和极性交换。进行了五个实验来确定当 EKR 在 0.2 V·cm ^-1下进行时极性交换、阵列吸附区及其组合对 Cd 去除的影响. 结果表明，阵列吸附区和极性交换的结合使用实现了最佳修复，平均Cd去除效率为83%。此外，由极性交换引起的 Cd 的往复运动不再是副作用。在小麦栽培试验中，采用阵列吸附区和极性交换的EKR去除Cd后，小麦根、茎和叶的Cd浓度分别下降了86%、93%和95%。30天能耗为7.72 kWh·m ^-3，远低于其他增强方法。目前的工作提出了一种在低电压下对 Cd 污染土壤有效的 EKR 技术。