Removal of acid green dye 50 from wastewater by anodic oxidation and electrocoagulation—A comparative study

The present work represents a comparative study for removing acid green dye 50 by anodic oxidation and electrocoagulation using a new batch self gas stirred electrochemical cell. The effect of operating parameters such as current density, initial dye concentration, NaCl concentration and pH on the e...

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Bibliographic Details
Published in:Journal of hazardous materials 2010-07, Vol.179 (1), p.113-119
Main Authors: El-Ashtoukhy, E-S.Z., Amin, N.K.
Format: Article
Language:English
Subjects:
Acid green dye
Anodizing
Color
Color removal
Current density
Decolourization
Dyes
Economics
Electrochemical oxidation
Electrochemistry
Electrocoagulation
Electrodes
Hydrogen - chemistry
Hydrogen-Ion Concentration
Kinetics
Lissamine Green Dyes - isolation & purification
Mathematical analysis
Oxidation-Reduction
Oxygen - chemistry
Oxygen demand
Sewage - analysis
Sodium Chloride - chemistry
Solutions
Waste Disposal, Fluid
Waste water
Wastewater treatment
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Summary:The present work represents a comparative study for removing acid green dye 50 by anodic oxidation and electrocoagulation using a new batch self gas stirred electrochemical cell. The effect of operating parameters such as current density, initial dye concentration, NaCl concentration and pH on the efficiency of colour removal has been examined. The chemical oxygen demand (COD) reduction under suitable operating conditions was also calculated and found to be reduced by 68% and 87% in case of electrochemical oxidation and electrocoagulation methods, respectively. The results indicate that electrocoagulation is more economic than anodic oxidation, energy consumption ranged from 2.8 to 12.8 kWh/kg dye removed in case of electrocoagulation while in case of anodic oxidation it ranged from 3.31 to 16.97 kWh/kg dye removed. Although the mechanisms of electrocoagulation and anodic oxidation are different, results show that the first-order rate equation provides the best correlation for the decolourization rate of acid green 50 by the two methods.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2010.02.066