Electrokinetic remediation technique is widely applied for the removal of heavy metal from contaminated soil, but the soil buffering capacity and fractionation of heavy metals mainly affect the cost and duration of the treatment. This study aims to treat heavy metal-contaminated sediments by electrokinetic remediation (EKR) technique by using various enhancing agents such as EDTA, \({HNO_3}\), HCI, \({H_2SO_4}\), acetic acid and citric acid for optimizing the cost and treatment duration. The optimum molar concentration of enhancing agent for treatment was estimated by batch experiments to maximize the dissolution of target heavy metals and reduce the dissolution of earth metals (Fe, Al and Ca) to maintain soil health. The EKR experiments were performed up to 15 days with the above enhancing agents to reduce the risk associated with heavy metals and the selection of enhancing agents based on removal efficiency was found to be in an order of EDTA > citric acid > acetic acid > \({HNO_3}\) > HCl \(\ge\) \({H_2SO_4}\). Also, a numerical model has been developed by incorporating main electrokinetic transport phenomena (electromigration and electroosmosis) and geochemical processes for the prediction of treatment duration and to scale up the EKR process. The model predicts well with experimental heavy metal removal with a MAPD of \(\approx\) 2-18 %. The parametric study on electrode distance for full-scale EKR treatment was found in this study as \(\approx\) 0.5 m.

电动修复技术已广泛用于去除污染土壤中的重金属，但土壤的缓冲能力和重金属的分馏主要影响处理的成本和持续时间。本研究旨在通过电动修复（EKR）技术，使用各种增强剂，例如EDTA，\（{HNO_3} \），HCl，\（{H_2SO_4} \）处理重金属污染的沉积物。，乙酸和柠檬酸，以优化成本和治疗时间。通过分批实验估算了用于处理的增强剂的最佳摩尔浓度，以最大程度地溶解目标重金属，并减少土壤金属（Fe，Al和Ca）的溶解，以保持土壤健康。用上述增强剂进行了长达15天的EKR实验，以降低与重金属有关的风险，并且根据去除效率选择增强剂的顺序为EDTA>柠檬酸>乙酸> \（ {HNO_3} \） > HCl \（\ ge \） \（{H_2SO_4} \）。此外，已经通过结合主要的电动迁移现象（电迁移和电渗）和地球化学过程开发了一个数值模型，以预测治疗时间并扩大EKR过程。该模型与实验重金属去除用的MAPD预测井\（\约\） 2-18％。在这项研究中发现了用于全尺寸EKR处理的电极距离的参数研究为\（\ approx \） 0.5 m。