Electrooxidation Using Nb/BDD as Post-Treatment of a Reverse Osmosis Concentrate in the Petrochemical Industry

Salatiel Wohlmuth da Silva, Carla Denize Venzke, Júlia Bitencourt Welter, Daniela Eduarda Schneider, Jane Zoppas Ferreira, Marco Antônio Siqueira Rodrigues and Andréa Moura Bernardes
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Salatiel Wohlmuth da Silva: Universidade Federal do Rio Grande do Sul (UFRGS), Instituto de Pesquisas Hidráulicas (IPH), Av. Bento Gonçalves, Porto Alegre/RS 9500, Brazil
Carla Denize Venzke: Universidade Federal do Rio Grande do Sul (UFRGS), Programa de Pós-Graduação em Engenharia de Minas, Metalúrgica e de Materiais (PPGEM), Av. Bento Gonçalves, Porto Alegre/RS 9500, Brazil
Júlia Bitencourt Welter: Universidade Federal do Rio Grande do Sul (UFRGS), Programa de Pós-Graduação em Engenharia de Minas, Metalúrgica e de Materiais (PPGEM), Av. Bento Gonçalves, Porto Alegre/RS 9500, Brazil
Daniela Eduarda Schneider: Universidade Federal do Rio Grande do Sul (UFRGS), Programa de Pós-Graduação em Engenharia de Minas, Metalúrgica e de Materiais (PPGEM), Av. Bento Gonçalves, Porto Alegre/RS 9500, Brazil
Jane Zoppas Ferreira: Universidade Federal do Rio Grande do Sul (UFRGS), Programa de Pós-Graduação em Engenharia de Minas, Metalúrgica e de Materiais (PPGEM), Av. Bento Gonçalves, Porto Alegre/RS 9500, Brazil
Marco Antônio Siqueira Rodrigues: Universidade Feevale, Campus II ERS-239, Novo Hamburgo 2755, RS, Brazil
Andréa Moura Bernardes: Universidade Federal do Rio Grande do Sul (UFRGS), Programa de Pós-Graduação em Engenharia de Minas, Metalúrgica e de Materiais (PPGEM), Av. Bento Gonçalves, Porto Alegre/RS 9500, Brazil

IJERPH, 2019, vol. 16, issue 5, 1-12

Abstract: This work evaluated the performance of an electrochemical oxidation process (EOP), using boron-doped diamond on niobium substrate (Nb/BDD), for the treatment of a reverse osmosis concentrate (ROC) produced from a petrochemical wastewater. The effects of applied current density (5, 10, or 20 mA·cm −2 ) and oxidation time (0 to 5 h) were evaluated following changes in chemical oxygen demand (COD) and total organic carbon (TOC). Current efficiency and specific energy consumption were also evaluated. Besides, the organic byproducts generated by EOP were analyzed by gas chromatography coupled to mass spectrometry (GC–MS). The results show that current densities and oxidation time lead to a COD and TOC reduction. For the 20 mA·cm −2 , changes in the kinetic regime were found at 3 h and associated to the oxidation of inorganic ions by chlorinated species. After 3 h, the oxidants act in the organic oxidation, leading to a TOC removal of 71%. Although, due to the evolution of parallel reactions (O 2 , H 2 O 2, and O 3 ), the specific energy consumption also increased, the resulting consumption value of 66.5 kW·h·kg −1 of COD is considered a low energy requirement representing lower treatment costs. These results encourage the applicability of EOP equipped with Nb/BDD as a treatment process for the ROC.

Keywords: petrochemical wastewater; reverse osmosis concentrate; boron-doped diamond on niobium substrate; electrochemical advanced oxidation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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