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Cd^(2+)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Cd^(2+)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Cd^(2+)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Cd^(2+)发生了电絮凝。此外,扰动条件下可以加速Cd^(2+)吸附及电化学反应过程。
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 Cd^(2+)in sediments under electric field were studied by using the low-pressure DC sediment disturbance simulation device. Results manifested that the saturated adsorption of Cd^(2+)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 Cd^(2+)to solid phase and electrode network increased at 30 V voltage, and the Cd^(2+)atom content in cathode electrode network increased from 0.05% to 0.19% mainly due to the electrocoagulation of Cd^(2+)in liquid phase. In addition, the adsorption and electrochemical reaction of Cd^(2+)can be accelerated under the condition of disturbance.
作者
刘叶
汪存石
吴绍凯
沈文韬
徐剑波
白王军
祝建中
LIU Ye;WANG Cun-shi;WU Shao-kai;SHEN Wen-tao;XU Jian-bo;BAI Wang-jun;ZHU Jian-zhong(College of Environment,Hohai University,Nanjing 210089,China;Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education,Hohai University,Nanjing 210089,China;The Second Engineering Company of CCCC Fourth Harbor Engineering Co.,Ltd.,Guangzhou 510230,China;State Grid Jiangsu Electric Power Engineering Consulting Co.,Ltd.,Nanjing 210036,China;China First Metallurgical Group Co.,Ltd.,Wuhan 430081,China;Hohai University Design Institute Co.,Ltd.,Nanjing 210098,China)
出处
《长江科学院院报》
CSCD
北大核心
2023年第2期60-66,共7页
Journal of Changjiang River Scientific Research Institute
基金
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)。
关键词
淤泥吸附
电场作用
重金属污染
迁移
电化学反应
sediment adsorption
electric field
heavy metal pollution
migration
electrochemical reaction
