电动修复过程中电解质浓度对U(Ⅵ)迁移和能耗的影响

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Abstract

A composite electrolyte with citric acid and ferric chloride was used to study the effects of different electrolyte concentrations on U(VI) migration behavior and energy efficiency. The results revealed the optimal concentration combination was 0.1mol/L for citric acid, and 0.03mol/L for FeCl_3. The corresponding removal efficiency of uranium was about (61.55±0.41)%, the cumulative energy consumption was 0.2559kW·h, and the energy utilization ratio β was (0.24±0.02)×10³. Visual MNIETQ software was further used to simulate theaqueous U speciation in citric acid and ferric chloride solutions at pH 3.0. The results showed that a large amount of uranium-citrate complex (UO₂-Citrate^-) and a small amount of uranyl ion (UO₂²⁺) existed in the process, and uranium mainly migrated from cathode to anode. When the concentration of ferric chloride increased to 0.05mol/L, the removal rate of uranium decreased correspondingly. This phenomenon was related to the strength and direction of electroosmotic flow and the adsorption of colloidal hydroxide. Compared with single citric acid and hydrochloric acidelectrolyte, the electrolyte combined with citric acid and ferric chloride has the advantages of higher removal efficiency, lower leaching toxicity and little harm after electrokinetic (EK) remediation.

Key words： uranium contaminated soil citric acid ferric chloride electrokinetic remediation migration behavior

Received: 24 June 2019

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X25

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	Articles by authors
	ZHOU Shu-kui
	XIAO Jiang
	LIU Ying-jiu
	CHU Lu-ping
	ZHANG Jian
	TIAN Lin-yu
	LI Jia-li

Cite this article:

ZHOU Shu-kui,XIAO Jiang,LIU Ying-jiu等. Effect of electrolyte concentration on U(VI) migration behavior and energy utilization in electrokinetic remediation process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(12): 5228-5239.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I12/5228

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