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Degradation of Agro-Industrial Wastewater Model Compound by UV-A-Fenton Process: Batch vs. Continuous Mode

Author

Listed:
  • Nuno Jorge

    (Escuela Internacional de Doctorado (EIDO), Campus da Auga, Campus Universitário de Ourense, Universidade de Vigo, As Lagoas, 32004 Ourense, Spain
    Centro de Química de Vila Real (CQVR), Departamento de Química, Universidade de Trás-os-Montes e Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal)

  • Ana R. Teixeira

    (Centro de Química de Vila Real (CQVR), Departamento de Química, Universidade de Trás-os-Montes e Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal)

  • José R. Fernandes

    (Centro de Química de Vila Real (CQVR), Departamento de Física, Universidade de Trás-os-Montes e Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal)

  • Ivo Oliveira

    (Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB), University of Trás-os-Montes and Alto Douro (UTAD), 5000-801 Vila Real, Portugal)

  • Marco S. Lucas

    (Centro de Química de Vila Real (CQVR), Departamento de Química, Universidade de Trás-os-Montes e Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal)

  • José A. Peres

    (Centro de Química de Vila Real (CQVR), Departamento de Química, Universidade de Trás-os-Montes e Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal)

Abstract

The degradation of a model agro-industrial wastewater phenolic compound (caffeic acid, CA) by a UV-A-Fenton system was investigated in this work. Experiments were carried out in order to compare batch and continuous mode. Initially, batch experiments showed that UV-A-Fenton at pH 3.0 (pH of CA solution) achieved a higher generation of HO • , leading to high CA degradation (>99.5%). The influence of different operational conditions, such as H 2 O 2 and Fe 2+ concentrations, were evaluated. The results fit a pseudo first-order (PFO) kinetic model, and a high kinetic rate of CA removal was observed, with a [CA] = 5.5 × 10 −4 mol/L, [H 2 O 2 ] = 2.2 × 10 −3 mol/L and [Fe 2+ ] = 1.1 × 10 −4 mol/L ( k CA = 0.694 min −1 ), with an electric energy per order ( E EO ) of 7.23 kWh m −3 order −1 . Under the same operational conditions, experiments in continuous mode were performed under different flow rates. The results showed that CA achieved a steady state with higher space-times (θ = 0.04) in comparison to dissolved organic carbon (DOC) removal (θ = 0–0.020). The results showed that by increasing the flow rate ( F ) from 1 to 4 mL min −1 , the CA and DOC removal rate increased significantly ( k CA = 0.468 min −1 ; k DOC = 0.00896 min −1 ). It is concluded that continuous modes are advantageous systems that can be adapted to wastewater treatment plants for the treatment of real agro-industrial wastewaters.

Suggested Citation

  • Nuno Jorge & Ana R. Teixeira & José R. Fernandes & Ivo Oliveira & Marco S. Lucas & José A. Peres, 2023. "Degradation of Agro-Industrial Wastewater Model Compound by UV-A-Fenton Process: Batch vs. Continuous Mode," IJERPH, MDPI, vol. 20(2), pages 1-15, January.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:2:p:1276-:d:1031424
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    References listed on IDEAS

    as
    1. Nuno Jorge & Ana R. Teixeira & Carlos C. Matos & Marco S. Lucas & José A. Peres, 2021. "Combination of Coagulation–Flocculation–Decantation and Ozonation Processes for Winery Wastewater Treatment," IJERPH, MDPI, vol. 18(16), pages 1-26, August.
    2. Elena Spennati & Alessandro Alberto Casazza & Attilio Converti, 2020. "Winery Wastewater Treatment by Microalgae to Produce Low-Cost Biomass for Energy Production Purposes," Energies, MDPI, vol. 13(10), pages 1-14, May.
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    Cited by:

    1. Nuno Jorge & Ana R. Teixeira & Lisete Fernandes & Sílvia Afonso & Ivo Oliveira & Berta Gonçalves & Marco S. Lucas & José A. Peres, 2023. "Treatment of Winery Wastewater by Combined Almond Skin Coagulant and Sulfate Radicals: Assessment of HSO 5 − Activators," IJERPH, MDPI, vol. 20(3), pages 1-22, January.

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