Abstract
Electrocoagulation (EC) using aluminum (Al) and stainless steel (SS) electrodes was investigated for color and chemical oxygen demand (COD) removal from a simulated spent disperse dyebath. EC was optimized for electrolyte (NaCl) concentration (750–3000 mg/L), current density (9–87 mA/cm2), and initial pH (3.5–11.5). Optimum EC conditions were established as 2,500 mg/L NaCl, pHo = 7.0 and 44 mA/cm2 for 100% color and 58% COD removals using Al electrodes (total treatment time = 30 min), whereas 100% color and 45% COD removals were obtained for 2,000 mg/L NaCl, pHo = 7.3 and a current density of 44 mA/cm2 when SS electrodes were employed for a 60-min treatment. EC results were compared with color and COD removals achieved via coagulation with alum, ferrous sulfate, and ferric chloride at varying doses (200–2,000 mg/L). Alum was more effective in color (100%) and COD (64%) removals than ferrous sulfate and ferric chloride. The amount of sludge formed during EC using SS electrodes was approximately 10 times le...
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