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Abstract
The aim of this study is to investigate the optimum conditions for col or removal and COD reduction from simulated textile effluent by anodic process which is either anodic oxidation by insoluble anode or electrocoagulation by soluble anode and to study the effect of the electrochemical techniques for different dyes removal (acid, direct and reactive) using different electrode materials (lead (Pb), iron (Fe) and aluminum (AI». The following parameters were studied for different dye concentrations: Current •Electrolyte concentration pH Solution velocity •Temperature In these experiments fixed bed electrochemical reactor were used for its high surface area, high space time yield and compact cross section area. Optimum conditions in case of anodic oxidation using lead anode: For reactive dye: Reaction time= 40 min, 50 ppm dye concentration, current= 2A, 16.67 g/l Na2S04, pH= 4, 0.157 mls solution velocity, t= 25 QC. Under these conditions C.R= 98%. odirect dye: Reaction time= 40 min, 50 ppm dye concentration, current= 4A, 16.67 g/l Na2S04, pH= 3, 0.150 mls solution velocity, t= 25 QC. Under these conditions C.R = 97.1 %. For acid dye:
Reaction time= 35 min, 50 ppm dye concentration, current= 2A, 16.67 g11 Na2S04, pH= 3, 0.150 mls solution velocity, t= 25 QC. Under these conditions C.R= 89.18%. Optimum conditions in case Fe EC: For direct dye: Reaction time= 6 min, 50 ppm dye concentration, current= 2A, 2 gll NaCl, pH= 6, 0.008 mls solution velocity, t= 25 QC. Under these conditions C.R= 92.6%, COD reduction= 33.33%. For acid dye:
Reaction time= 6 min, 50 ppm dye concentration, current= 2A, I gll NaCl, pH= 6, 0.008 mls solution velocity, t= 25 QC. Under these conditions C.R= 96.6 %, COD reduction= 52%.
Optimum conditions in case AI EC: For direct dye: Reaction time= 6 min, 50 ppm dye concentration, current= I A, 4 gll NaCI, pH== 6, 0.005 m/s solution velocity, t= 25 °t. Under these conditions C.R= 97.07 %, COD reduction= 38.46%. For acid dye:
Reaction time= 6 min, 50 ppm dye concentration, current= I A, 4g/1 NaCl, pH= 6, 0.005 m/s solution velocity_ t= 250C. Under these conditions C.R= 89.15%, COD reduction= 41.66%. economic point of view EC using AI anode material is the best aanode material as it has found that to remove I kg of direct dye requires 2.74 L.E while in case of Fe requires 5.43 L.E. % Color Removal was 97.07% in case of EC using Al anode & was 92.6% in case of EC using Fe anode.