Experimental Study on Enhanced Electrokinetic Remediation of Heavy Metal-contaminated Soil

• 作者: Wanmeng WANG
• 来源期刊: 农业生物技术:英文版
• 学科: 教育
• 关键词: Cadmium Soil pollution ELECTRODYNAMICS APPROACHING ANODE METHOD INTERMITTENT current METHOD
• 年，卷（期）: 2019,（6）
• 页码范围: 86-89
• 页数: 4页
• 分类号: G63

摘要

In order to improve the efficiency of traditional electrokinetic remediation method of heavy metal-contaminated soil, cadmium-contaminated soil was remediated by two enhanced electrokinetic techniques, namely, the approaching anode method and intermittent current method. The remediation effect was verified under the conditions that the electric field strength was 2 V/cm, 0.1 mol/L citric acid was used as the electrolyte, and the remediation reaction time was 96 h. The results showed that for the approaching anode method, when the average electromigration distance was 5.48, the removal rate was 88.12%, which was 10.47% higher than the unenhanced technique, and the energy consumption per unit volume was 7.36 kWh/m~3;and as to the intermittent current method, the removal rate was 80.81%, and the energy consumption per unit volume was 8.12 kWh/m~3, which was relatively reduced by 33.07%. After the remediation, the proportions of the weak acid extractive form and reducible form of calcium decreased, and the proportions of the oxidizable form and residual form of cadmium did not change significantly.