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。
刘叶
,
汪存石
,
吴绍凯
,
沈文韬
,
徐剑波
,
白王军
,
祝建中
. 电场对高含水率淤泥中Cd2+迁移及去除的影响[J]. 长江科学院院报, 2023
, 40(2)
: 60
-66
.
DOI: 10.11988/ckyyb.20210960
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.
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