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。
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.
关键词
淤泥吸附 /
电场作用 /
重金属污染 /
迁移 /
电化学反应
Key words
sediment adsorption /
electric field /
heavy metal pollution /
migration /
electrochemical reaction
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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)
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