Evaluation of Field Applicability of Sewage Treated with an Electrochemical Floatation System Coupled with a Separation Membrane Process

An electrochemical floatation system (EFS)-based sewage-treatment process that applied a dimensionally stable anode (DSA) was developed to secure treated sewage water from sewage-treatment plants for reuse. The DSA was fabricated at a temperature of 673–923 K by dispersing a low quantity of activate...

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Bibliographic Details
Published inWater (Basel) Vol. 16; no. 2; p. 293
Main Authors Yun, Sang-Leen, Kim, Seogku, Oh, Hye-Cheol, Hong, Min
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.01.2024
Subjects
Activated carbon
Analysis
Aquatic resources
Biochemical oxygen demand
Climatic changes
dimensionally stable anode
Droughts
Efficiency
electrochemical floatation system
Electrodes
Japan
Metal oxides
organic matter
Oxidation
Pollutants
Polymer industry
Sedimentation & deposition
separation membrane
sewage reuse
South Korea
Water pollution
Water shortages
Water treatment
Water-supply
South Korea
Japan
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Summary:An electrochemical floatation system (EFS)-based sewage-treatment process that applied a dimensionally stable anode (DSA) was developed to secure treated sewage water from sewage-treatment plants for reuse. The DSA was fabricated at a temperature of 673–923 K by dispersing a low quantity of activated carbon on a titanium plate coated with mixed metal oxides (Pt, Re, Pd, Re, and Ir) to a thickness of 5 μm. The average size of the bubbles generated through the DSA of the EFS was 20–40 μm, thus confirming microbubble generation. An efficiency assessment of a titanium-based DSA confirmed metal oxide activity through the removal of Escherichia coli (100%) and total organic carbon (TOC; 48.83%) at a reaction time shorter than 10 min and a low current density (19.6 A/m2). During the long-term operation of the EFS with the separation membrane process, the average removal efficiency was 94.7%, 90.0%, 96.1%, 90.9%, and 98.0% for suspended solids, biochemical oxygen demand, TOC, total nitrogen, and total phosphorous, respectively. Coliforms were not detected. Overall, our EFS coupled with the separation membrane process produced high-quality recycled water that could be used for various purposes according to the water-quality standards for different applications.
ISSN:2073-4441
2073-4441
DOI:10.3390/w16020293