Container washing wastewater treatment by combined electrocoagulation–electrooxidation

Treatment of container washing wastewater (CWW) by using combined electrocoagulation (EC)-electrooxidation (EO) process was studied. CWW contains many organic compounds such as surfactants used in cleaning agents. Wastewater was first treated by EC with iron (Fe) and aluminum (Al) electrodes. The pr...

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Bibliographic Details
Published in:Separation science and technology 2018-07, Vol.53 (10), p.1592-1603
Main Authors: Yılmaz Nayır, Tülin, Kara, Serdar
Format: Article
Language:English
Subjects:
Aluminium
Aluminum
Boron
Chemical oxygen demand
Cleaning
Cleaning agents
Color
Color removal
Containers
Current density
Efficiency
Electrochemistry
Electrocoagulation
Electrodes
Iron
Molecular chains
Organic compounds
pH effects
Pollutants
Removal
Surfactants
Washing
Wastewater
Wastewater treatment
Water color
Water colour
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Summary:Treatment of container washing wastewater (CWW) by using combined electrocoagulation (EC)-electrooxidation (EO) process was studied. CWW contains many organic compounds such as surfactants used in cleaning agents. Wastewater was first treated by EC with iron (Fe) and aluminum (Al) electrodes. The process performance was measured according to the removal efficiencies of soluble chemical oxygen demand (sCOD) and color. Maximum sCOD removal efficiency was found 82% and color removal efficiencies were 95%, 95% and 98% at 436, 525 and 620 nm, respectively, with Fe electrodes under 25 mA/cm2 current density, initial pH of 5 and 120-min operation time. Because of the low sCOD removal efficiency, EO was used as post-treatment process by using boron doped diamond electrode (BDD). sCOD removal efficiency was increased to 89% and color removal efficiencies decreased to 72%, 64%, 71% at 436, 525 and 620 nm, respectively, under 25 mA/cm2 current density, initial pH of 3 and 300-min operation time. This study showed that electrochemical processes caused new complex molecules formation in the CWW, which caused deterioration of water color and limited the process efficiency.
ISSN:0149-6395
1520-5754
DOI:10.1080/01496395.2017.1411365