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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.)

Energy consumption and reaction rate optimization combining turbulence promoter and current modulation for electrochemical mineralization

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Author(s):
Faria, Lurima U. S. [1] ; Oliveira, Kaique S. G. C. [1] ; Veroli, Alyne B. [1] ; Aquino, Jose M. [2] ; Ruotolo, Luis A. M. [1]
Total Authors: 5
Affiliation:
[1] Univ Fed Sao Carlos, Dept Chem Engn, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Chem, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: CHEMICAL ENGINEERING JOURNAL; v. 418, AUG 15 2021.
Web of Science Citations: 0
Abstract

Electrooxidation stands out as a promising technique for treating effluents containing toxic organic compounds. However, the high energy consumption remains an obstacle to its large-scale application. The aim of this work was to optimize the electrooxidation process by combining current modulation, where the applied current was maintained close to the limiting value, with turbulence promoters (TPs) to improve the mass transfer, consequently shortening the mineralization time. Electrooxidation was performed in an electrochemical flow reactor, with phenol selected as a model compound. A plastic mesh turbulence promoter (MTP) and reticulated vitreous carbon (RVC) were evaluated as TPs. The combined approach enabled reduction of the energy consumption from 168 +/- 31 kWh kg(-1) TOC (galvanostatic mode) to 72 +/- 6 kWh kg(-1) TOC {[}modulated current (MC) + MTP]. Additionally, the improvement of the mineralization kinetics reduced the electrolysis time by similar to 30%. Under galvanostatic conditions, use of the RVC outperformed the mineralization performance observed using the MTP, but similar efficiency was observed applying the MC mode at low flow velocities. The results reinforced the potential of electrooxidation as an option for the treatment of effluents, paving the way to obtain a process with fast degradation kinetics and high mineralization efficiency, leading to low energy consumption. (AU)

FAPESP's process: 17/19838-5 - DESALINATION AND SEPARATION OF AMINO ACIDS BY ELECTROSSORPTION USING ELECTRODES OF ACTIVATED GRAPHENE
Grantee:Luis Augusto Martins Ruotolo
Support Opportunities: Regular Research Grants