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

LIU Ye; WANG Cun-shi; WU Shao-kai; SHEN Wen-tao; XU Jian-bo; BAI Wang-jun; ZHU Jian-zhong

doi:10.11988/ckyyb.20210960

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Journal of Changjiang River Scientific Research Institute ›› 2023, Vol. 40 ›› Issue (2) : 60-66. DOI: 10.11988/ckyyb.20210960

WATER ENVIRONMENT AND WATER ECOLOGY

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

LIU Ye^1,2, WANG Cun-shi^1,2, WU Shao-kai³, SHEN Wen-tao⁴, XU Jian-bo⁵, BAI Wang-jun⁶, ZHU Jian-zhong^1,2

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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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LIU Ye, WANG Cun-shi, WU Shao-kai, SHEN Wen-tao, XU Jian-bo, BAI Wang-jun, ZHU Jian-zhong. Effects of Electric Field on Migration and Removal of Cd²⁺ in Sediment of High Moisture Content[J]. Journal of Changjiang River Scientific Research Institute. 2023, 40(2): 60-66 https://doi.org/10.11988/ckyyb.20210960

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