Effect of placement angles on wireless electrocoagulation for bipolar aluminum electrodes

doi:10.1007/s11783-018-1034-y

Front. Environ. Sci. Eng.

2018, Vol. 12

Issue (3) : 9 https://doi.org/10.1007/s11783-018-1034-y

RESEARCH ARTICLE

Effect of placement angles on wireless electrocoagulation for bipolar aluminum electrodes

Zhenlian Qi, Jinna Zhang, Shijie You(

)

State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China

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Abstract

A new electrocoagulation process based on bipolar aluminum electrode is proposed.

The placement angles of bipolar electrode are key parameter.

The numerical simulations support the experimental results.

We in our previous study reported the wireless electrocoagulation (WEC) based on bipolar electrochemistry for water purification. One of the most important advantages of WEC is the omission of ohmic connection between bipolar electrode (BPE) and power supply, and thus the electrochemical reactions on BPE are driven by electric field in solution induced by driving electrodes. In this study, the impact of placement angle of bipolar aluminum electrode on WEC was investigated to provide a detailed analysis on the correlations between the bipolar electrode placement angle and bipolar electrocoagulation reactions. The results showed that the WEC cell with a horizontal BPE placed at 0° produced the maximum dissolved aluminum coagulant, accounting for 71.6 % higher than that with a vertical one placed at 90°. Moreover, the finite element simulations of current and potential distribution were carried out along the surface of BPE at different placement angles, revealing the mechanism of different BPE placement angles on aluminum dissolution rates in WEC system.

Keywords Bipolar electrochemistry Wireless electrocoagulation Placement angle

Corresponding Author(s): Shijie You

Issue Date: 29 March 2018

Cite this article:

Zhenlian Qi,Jinna Zhang,Shijie You. Effect of placement angles on wireless electrocoagulation for bipolar aluminum electrodes[J]. Front. Environ. Sci. Eng., 2018, 12(3): 9.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-018-1034-y
https://academic.hep.com.cn/fese/EN/Y2018/V12/I3/9

Fig.1 Total aluminum concentration as a function of (a) driving voltage at different electrolyte conductivities and (b) electrolyte conductivity at the driving voltage of 15 V in the reaction time of 20 min

Fig.2 Total aluminum concentration as a function of BPE placement angle at 0° (horizontal), 45° (sloping) and 90° (vertical) relative to the horizontal electric field line formed in the solution

Fig.3 Potential distribution along the surface of BPE at different placement angles (0°, 45°, and 90°) relative to the direction of electric field

Fig.4 Numerical simulation of potential (colored scale) and current (white line) in the (a) absence and presence of BPE for different placing angles of (b) 90°, (c) 45°, (d) 0° relative to the horizontal direction

Fig.5 SEM observation of corrosion morphology along the length of horizontal BPE at location of (a) 0 mm, (b) 20 mm, (c) 30 mm and (d) 50 mm distanced from the anodic end.

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