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

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 effe...

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Bibliographic Details
Published in:Sustainability 2023-03, Vol.15 (6), p.5551
Main Authors: Phan, Huy N. Q, Leu, Jyh Hoang, Nguyen, Vi N. D
Format: Article
Language:English
Subjects:
Anaerobic digestion
Anaerobic processes
Analysis
Beverage industry
Chemical oxygen demand
Chloride
Control
Efficiency
Effluents
Electrodes
Electrolysis
Electrolytes
Electrolytic cells
Energy consumption
Hydraulic retention time
Hydrochloric acid
Investigations
Management
Methods
Oxidation
Pollutants
Purification
Retention time
Sewage
Sludge
Sodium chloride
Specific energy
Sustainability
Sustainable development
System effectiveness
Titanium
Waste management
Wastewater reuse
Wastewater treatment
Water
Water scarcity
Water treatment
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Summary: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 (CH4 and H2) 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.
ISSN:2071-1050
2071-1050
DOI:10.3390/su15065551