<bold></bold>Application of electrochemical depassivation in PRB systems to recovery Fe<sup><bold></bold>0</sup><bold></bold> reactivity

doi:10.1007/s11783-016-0843-0

Front. Environ. Sci. Eng.

2016, Vol. 10

Issue (4) : 4 https://doi.org/10.1007/s11783-016-0843-0

RESEARCH ARTICLE

Application of electrochemical depassivation in PRB systems to recovery Fe⁰ reactivity

Xin LU^1,^2,³,Miao LI¹,Hao DENG^2,³,Pengfei LIN⁴,Mark R. MATSUMOTO⁵,Xiang LIU^1,^*(

)

1. School of Environment, Tsinghua University, Beijing 100084, China
2. CNPC Research Institute of Safety & Environmental Technology, Beijing 102206, China
3. State Key Laboratory of Petroleum and Petrochemical Pollution Control and Treatment, Beijing 102206, China
4. College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China
5. Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA

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Abstract

Utilizing electrochemical depassivation to recovery Fe⁰ activity was effective, and minerals were cleaned layer by layer, with no ions secondary contamination, and no transformation from Cr(III) to Cr(VI).

Electrochemical depassivation process under various electrolysis conditions was revealed.

Electro-PRB configuration for caisson excavation construction technique was designed.

Permeable reactive barriers (PRBs) show remarkable Cr(VI) removal performance. However, the diminished removal rate because of mineral fouling over time is the bottleneck for application of PRBs. The present study demonstrated that electrochemical depassivation was effective for recovering the Fe⁰ reactivity, and minerals can be cleaned layer by layer with no secondary ion contamination and no transformation from Cr(III) to Cr(VI). The removal recovery rate increased with increasing electrolysis voltage before reaching the optimal electrolysis voltage, and then decreased as the electrolysis voltage further increased. The recovery effect at electrolysis voltages of 5, 10, and 15 V show the same trend as a function of electrolysis time, where recovery rate first increased and then decreased after reaching the optimal electrolysis time. The Cr(VI) removal rate significantly decreased with increasing electrolysis distance. Furthermore, Fe⁰ brush meshes electrode, Fe⁰ fillings, and polyvinyl chloride (PVC) meshes separators were combined to create an Electro-PRB configuration for the caisson excavation construction technique, which lays the foundation for establishment of promising Electro-PRB systems to treat Cr(VI)-contaminated groundwater.

Keywords PRB Cr(VI) Fe Passivation Electrochemical depassivation

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Corresponding Author(s): Xiang LIU

Issue Date: 09 May 2016

Cite this article:

Xin LU,Miao LI,Hao DENG, et al. Application of electrochemical depassivation in PRB systems to recovery Fe⁰ reactivity[J]. Front. Environ. Sci. Eng., 2016, 10(4): 4.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-016-0843-0
https://academic.hep.com.cn/fese/EN/Y2016/V10/I4/4

Fig.1 Cr(VI) removal process by Fe⁰ with and without electrochemical depassivation

Fig.2 SEM analysis of studied samples (a) acid-washed Fe⁰ (b1) passivated Fe⁰, (b2) (b3) passivated Fe⁰ with four different forms of minerals on the surface of passivated Fe⁰ (c1) 3 min Electro-Fe⁰ (c2) breaking down portion of 3 min-Electro-Fe⁰ (d1) 10 min-Electro-Fe⁰ (d2) breaking down portion of 10 min-electro-Fe⁰ (e) 40 min-Electro-Fe⁰

Fig.3 Raman spectra of studied samples

Fig.4 Cr K-edge XANES spectra of model compounds and the samples

Fig.5 Electrochemical depassivation under different electrolysis voltages. (a) Cr(VI) concentration as a function of elapsed time (b) concentration of Cr(VI) in the used electrolytes for different voltages

Fig.6 Cr(VI) concentration as a function of elapsed time for different electrolysis times: (a) electrolysis voltage 5 V (b) electrolysis voltage 10 V (c) electrolysis voltage 15 V

Fig.7 Cr(VI) concentration as a function of elapsed time for different electrolysis distances

Fig.8 Schematic of (a) Electro-PRB configuration for caisson excavation construction technology (b) brush electrode

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