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

Author

Listed:
  • 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
    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)

  • 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)

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.

Suggested Citation

  • Salatiel Wohlmuth da Silva & Carla Denize Venzke & Júlia Bitencourt Welter & Daniela Eduarda Schneider & Jane Zoppas Ferreira & Marco Antônio Siqueira Rodrigues & Andréa Moura Bernardes, 2019. "Electrooxidation Using Nb/BDD as Post-Treatment of a Reverse Osmosis Concentrate in the Petrochemical Industry," IJERPH, MDPI, vol. 16(5), pages 1-12, March.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:5:p:816-:d:211422
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    Cited by:

    1. Jing Hou & Xue Li & Yuting Yan & Lizhang Wang, 2022. "Electrochemical Oxidation of Methyl Orange in an Active Carbon Packed Electrode Reactor (ACPER): Degradation Performance and Kinetic Simulation," IJERPH, MDPI, vol. 19(8), pages 1-12, April.

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