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

Autor(es)

Wachter, Naihara ^[1] ; Bocchi, Nerilso ^[1] ; Rocha-Filho, Romeu C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, CP 676, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Separation and Purification Technology; v. 276, DEC 1 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 12/13002-9 - Degradação eletroquímica de um fármaco: comparação entre anodos
• Beneficiário: Naihara Wachter
• Modalidade de apoio: Bolsas no Brasil - Mestrado