Removal of Reactive Dyes from Textile Wastewater by Electrocoagulation Process: An Effective and Clean Approach

The removal of dye pollutants from industrial effluents is a rising concern in recent years. In this paper, the decolorization of strong colored solutions containing the reactive textile dyes was done by electrocoagulation process using aluminum electrodes in a lab scale reactor operated in batch mode. The effects of applied voltage, pH variation with time, current density, dye and COD concentrations, electrode connection mode, inter electrode distance and retention time on the decolorization efficiency have been investigated. Also, an optimum condition was defined based on effect of electrical energy consumption and electrode consumption. Dye removal followed good agreement with first order kinetics and the reaction rate constant and dye removal was found to be strong function of operational conditions and type of dye. As per experimental outcomes, dye and chemical oxygen demand removals were 99.0 and 82.7%, respectively and electrode consumption, energy consumption and operating cost were 0.0637 kg/m 3 , 4.6878 kWh/m 3 and 0.665 US$/m 3 correspondingly.

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