Decolorization of basic dye solutions by electrocoagulation: an investigation of the effect of operational parameters

N Daneshvar, A Oladegaragoze… - Journal of hazardous …, 2006 - Elsevier
N Daneshvar, A Oladegaragoze, N Djafarzadeh
Journal of hazardous materials, 2006Elsevier
Electrocoagulation (EC) is one of the most effective techniques to remove color and organic
pollutants from wastewater, which reduces the sludge generation. In this paper,
electrocoagulation has been used for the removal of color from solutions containing CI Basic
Red 46 (BR46) and CI Basic Blue 3 (BB3). These dyes are used in the wool and blanket
factories for fiber dyeing. The effect of operational parameters such as current density, initial
pH of the solution, time of electrolysis, initial dye concentration and solution conductivity …
Electrocoagulation (EC) is one of the most effective techniques to remove color and organic pollutants from wastewater, which reduces the sludge generation. In this paper, electrocoagulation has been used for the removal of color from solutions containing C. I. Basic Red 46 (BR46) and C. I. Basic Blue 3 (BB3). These dyes are used in the wool and blanket factories for fiber dyeing. The effect of operational parameters such as current density, initial pH of the solution, time of electrolysis, initial dye concentration and solution conductivity were studied in an attempt to reach higher removal efficiency. The findings in this study shows that an increase in the current density up to 60–80Am−2 enhanced the color removal efficiency, the electrolysis time was 5min and the range of pH was determined between 5.5 and 8.5 for two mentioned dye solutions. It was found that for, the initial concentration of dye in solutions should not be higher than 80mgl−1 in order to achieve a high color removal percentage. The optimum conductivity was found to be 8mScm−1, which was adjusted using proper amount of NaCl with the dye concentration of 50mgl−1. Electrical energy consumption in the above conditions for the decolorization of the dye solutions containing BR46 and BB3 were 4.70kWh(kgdye removed)−1 and 7.57kWh(kgdye removed)−1, respectively. Also, during the EC process under the optimized conditions, the COD decreased by more than 75% and 99% in dye solutions containing BB3 and BR46, respectively.
Elsevier
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