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

Huy N. Q. Phan, Jyh Hoang Leu () and Vi N. D. Nguyen
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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

Sustainability, 2023, vol. 15, issue 6, 1-17

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.

Keywords: high-strength wastewater; combination system; electro-oxidation; real beverage wastewater; anaerobic digestion (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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