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The Combination of Anaerobic Digestion and Electro-Oxidation for Efficient COD Removal in Beverage Wastewater: Investigation of Electrolytic Cells

Author

Listed:
  • Huy N. Q. Phan

    (Department of Materials Science and Engineering, Feng Chia University, Taichung 40744, Taiwan)

  • Jyh Hoang Leu

    (Master’s Program of Green Energy Science and Technology, Feng Chia University, Taichung 40744, Taiwan)

  • Vi N. D. Nguyen

    (Department of Chemical Engineering, Feng Chia University, Taichung 40744, Taiwan)

Abstract

The world’s ever-growing population is driving an increased demand for clean water, which makes treating and reusing wastewater an essential practice. In recent years, biological and physicochemical methods have been preferred for wastewater treatment, with combined systems proving particularly effective. In this study, the combination of anaerobic digestion (AD) and electro-oxidation (EO) was investigated as a process for removing chemical oxygen demand (COD) from actual beverage wastewater. The effect of hydraulic retention time (HRT) on AD, electrolysis time, sodium chloride (NaCl) dosage, initial pH, and electro-properties on EO was investigated. At optimum conditions, namely an HRT of 2 days for AD, NaCl concentration of 3 g L −1 , 80 min of EO time, natural pH (7.45), and applied voltage of 20 V for EO, the removal efficiency for COD was an impressive 96.47%, with energy consumption and specific energy consumption calculating 177.33 kWh m −3 and 33.79 kWh kgCOD −1 , respectively. The amount of by-product gases (CH 4 and H 2 ) were also meagerly determined in this study. The results confirm that combining the AD and EO methods is an effective COD removal solution that can benefit the industry, while also offering a sustainable solution to combat water scarcity and meet the growing demand for clean water.

Suggested Citation

  • Huy N. Q. Phan & Jyh Hoang Leu & Vi N. D. Nguyen, 2023. "The Combination of Anaerobic Digestion and Electro-Oxidation for Efficient COD Removal in Beverage Wastewater: Investigation of Electrolytic Cells," Sustainability, MDPI, vol. 15(6), pages 1-17, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:6:p:5551-:d:1103750
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    References listed on IDEAS

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    1. Yi-Tui Chen, 2017. "The Factors Affecting Electricity Consumption and the Consumption Characteristics in the Residential Sector—A Case Example of Taiwan," Sustainability, MDPI, vol. 9(8), pages 1-16, August.
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    3. Umesh Ghimire & Min Jang & Sokhee P. Jung & Daeryong Park & Se Jin Park & Hanchao Yu & Sang-Eun Oh, 2019. "Electrochemical Removal of Ammonium Nitrogen and COD of Domestic Wastewater using Platinum Coated Titanium as an Anode Electrode," Energies, MDPI, vol. 12(5), pages 1-13, March.
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