长江科学院院报 ›› 2023, Vol. 40 ›› Issue (2): 60-66.DOI: 10.11988/ckyyb.20210960

• 水环境与水生态 • 上一篇    下一篇

电场对高含水率淤泥中Cd2+迁移及去除的影响

刘叶1,2, 汪存石1,2, 吴绍凯3, 沈文韬4, 徐剑波5, 白王军6, 祝建中1,2   

  1. 1.河海大学 环境学院,南京 210089;
    2.河海大学 浅水湖泊综合治理与资源开发教育部重点实验室,南京 210089;
    3.中交四航局第二工程有限公司,广州 510230;
    4.国网江苏省电力工程咨询有限公司,南京 210036;
    5.中国一冶集团有限公司,武汉 430081;
    6.河海大学 设计研究院有限公司,南京 210098
  • 收稿日期:2021-09-08 修回日期:2021-11-23 出版日期:2023-02-01 发布日期:2023-03-07
  • 通讯作者: 祝建中(1970-),男,江西上饶人,教授,博士,研究方向为环境材料应用理论与技术。E-mail:zhuhhai2010@hhu.edu.cn
  • 作者简介:刘 叶(1998-),女,江苏溧阳人,硕士研究生,研究方向为淤泥污染控制技术。E-mail:1119255448@qq.com
  • 基金资助:
    国家自然科学基金项目(51979077);江苏省科技计划项目(BE2019121);中国一冶集团有限公司科研基金项目;国网江苏省电力工程咨询有限公司科研项目(821105016)

Effects of Electric Field on Migration and Removal of Cd2+ in Sediment of High Moisture Content

LIU Ye1,2, WANG Cun-shi1,2, WU Shao-kai3, SHEN Wen-tao4, XU Jian-bo5, BAI Wang-jun6, ZHU Jian-zhong1,2   

  1. 1. College of Environment, Hohai University, Nanjing 210089, China;
    2. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210089, China;
    3. The Second Engineering Company of CCCC Fourth Harbor Engineering Co., Ltd., Guangzhou 510230, China;
    4. State Grid Jiangsu Electric Power Engineering Consulting Co., Ltd., Nanjing 210036, China;
    5. China First Metallurgical Group Co., Ltd., Wuhan 430081, China;
    6. Hohai University Design Institute Co., Ltd., Nanjing 210098, China
  • Received:2021-09-08 Revised:2021-11-23 Published:2023-02-01 Online:2023-03-07

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摘要： 为验证淤泥电动修复技术去除重金属污染的有效性,以淤泥典型重金属污染物Cd2+为对象,结合低压直流淤泥扰动模拟装置,研究了电场作用下淤泥土的吸附特性及重金属离子扩散迁移规律。结果表明电场作用下淤泥土对Cd2+的饱和吸附量从0.438 mg/g提升至0.498 mg/g。淤泥土的XRD表征证实了矿物晶体的变化导致Zeta电位下降使得吸附能力提升。30 V电压下液相中的Cd2+向固相及电极网的迁移量增加,其中阴极电极网中Cd原子含量由0.05%提升至0.19%,主要原因是液相中Cd2+发生了电絮凝。此外,扰动条件下可以加速Cd2+吸附及电化学反应过程。

关键词: 淤泥吸附, 电场作用, 重金属污染, 迁移, 电化学反应

Abstract: The aim of this research is to verify the effectiveness of electrokinetic remediation technology in removing heavy metal pollution. The adsorption characteristics and the diffusion and migration of Cd2+ in sediments under electric field were studied by using the low-pressure DC sediment disturbance simulation device. Results manifested that the saturated adsorption of Cd2+ by silt under electric field increased from 0.438 mg/g to 0.498 mg/g. XRD analysis of sediment confirmed that the change of mineral crystal led to the decrease of Zeta potential and the enhancement of adsorption capacity. The migration of Cd2+ to solid phase and electrode network increased at 30 V voltage, and the Cd2+ atom content in cathode electrode network increased from 0.05% to 0.19% mainly due to the electrocoagulation of Cd2+ in liquid phase. In addition, the adsorption and electrochemical reaction of Cd2+ can be accelerated under the condition of disturbance.

Key words: sediment adsorption, electric field, heavy metal pollution, migration, electrochemical reaction

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