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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Is it worth the use of bipolar electrodes in electrolytic wastewater treatment processes?

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Souza, F. L. [1] ; Saez, C. [2] ; Lanza, M. R. V. [1] ; Canizares, P. [2] ; Rodrigo, M. A. [2]
Total Authors: 5
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Castilla La Mancha, Dept Chem Engn, Fac Chem Sci & Technol, E-13071 Ciudad Real - Spain
Total Affiliations: 2
Document type: Journal article
Source: CHEMICAL ENGINEERING JOURNAL; v. 264, p. 310-315, MAR 15 2015.
Web of Science Citations: 10

In this work, it is studied the advisability of the application of bipolar electrodes (consisting of boron doped diamond coatings) for the electrolytic treatment of wastewater. Results are discussed in terms of the success in two different reactions: the depletion of an organic pesticide (2,4-dichlorophenoxyacetic acid) and the oxidation of chlorides to perchlorates. This later reaction should be prevented in an actual environmental remediation process because of the hazardousness of perchlorate, but it has been investigated in this work because it gives valuable information about formation of oxidants during electrolytic processes as chlorates and perchlorates behaves as inert species in the oxidation of 2,4-D. Results pointed out the importance of the optimization of the number of bipolar electrodes to be included in each cell for a given application. Bipolar configuration can help to improve the results obtained in the removal of organic compounds by direct processes and it also influences on the formation oxidizing species that can improve the results of this electrolytic process. However, it increases significantly the cell voltage and hence the power consumption. In this work, it is demonstrate that each bipolar electrode saves around 22% of the electric charge provided by the single cell to deplete 2,4-D and to generate oxidants, although this positive effect is masked by the increase in the cell voltage. Energy required to oxidize organic increases with the number of bipolar electrodes installed in the cell while energy efficiency in the production of oxidants shows a maximum for the cell configuration with 1 bipolar electrode. (C) 2014 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 14/02580-7 - Green electrochemical technologies for the treatment of wastewater polluted with herbicides
Grantee:Fernanda de Lourdes Souza
Support type: Scholarships abroad - Research Internship - Post-doctor