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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.)

Use of a turbulence promoter in an electrochemical filter-press reactor: Consolidated evidence of significant enhancement of organics mass transport and degradation rates

Full text
Author(s):
Wachter, Naihara [1] ; Bocchi, Nerilso [1] ; Rocha-Filho, Romeu C. [1]
Total Authors: 3
Affiliation:
[1] Univ Fed Sao Carlos, Dept Quim, CP 676, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Separation and Purification Technology; v. 276, DEC 1 2021.
Web of Science Citations: 0
Abstract

In this communication, consolidated evidence of the significant effect of turbulence promotion on organics anodic oxidation is presented. Thus, the performance of a filter-press reactor fitted or not with a turbulence promoter (three randomly superposed plastic meshes) is assessed using a recirculating flow system. For a given volumetric flow rate (qV), the mass transfer coefficient (km) for the oxidation of the {[}Fe(CN)6]4- species at the surface of the boron-doped diamond anode (geometric area = 24.2 cm2) is increased approximately threefold (e. g. to 9.44 x 10-5 m s-1 at qV = 7.0 L min-1), indicating that mass transport is significantly enhanced by the presence of the turbulence promoter in the filter-press reactor. In fact, a given value of km can be attained using a qV value that is only about one fifth that needed in the absence of the turbulence promoter. Using bisphenol S (BPS) as a model organic compound, an approximately threefold increase in its degradation rate is also brought on by the use of the turbulence promoter, which e.g. means a reduction of - 62% in the electrolysis time to attain 98% BPS removal. Additionally, the mineralization rate is doubled, which e.g. means a reduction of - 45% in the electrolysis time needed to remove 84% of the solution organic load. These results confirm that turbulence promoters in filter-press reactors indeed enable significant savings in the energy expenses associated to the electrochemical degradation of organics, greatly increasing the efficiency of the process. (AU)

FAPESP's process: 12/13002-9 - Electrochemical degradation of a pharmaceutical: comparison between anodes
Grantee:Naihara Wachter
Support Opportunities: Scholarships in Brazil - Master