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A PPLICATION of electrocoagulation (EC) for removal of Chemical Oxygen Demand (COD) and color from textile wastewater is the aim of this research. Batch wise experiments were carried out using iron electrodes to investigate effect of pH, current density and electrolysis time on percentage removals. Results show maximum removal efficiency of COD (65%) and color (97%) at 0.9 A and 0.4 A, respectively at 1.6 V and 120 minutes reaction time. Moreover, the results show that the COD removal is influenced by the pH with maximum removal at pH 8. The EC process improves wastewater biodegradability with increasing BOD/ COD ratio from 29% to 34%. The results prove that the EC is effective in color and COD removal. Regarding electrical current, there was no significant difference between 0.5 A and 0.7A in color removal and so 0.5 A is selected as cost effective for the treatment process with estimated Electricity Consumption of 3.2 kWh/m 3. Impact of treated wastewater on oxygen uptake rate of activated sludge biomass was investigated and the results indicated that both dye and minerals content have negative impact and therefore it is recommended to reuse treated effluent in industrial processes or consider total dissolved solids in the effluent disposal limits.

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A review of the literature published on topics interrelated to electrochemical treatment within wastewater by using sacrificial anodes was presented. Electrocoagulation (EC) is a technique used for water and has a great ability on various wastewater treatments, industrial processed water, and medical treatment. It has potential in removing various pollutants such as chemical oxygen demand turbidity, ammonia, color, and suspended solid. One of the most necessities industries is Textile industries which release large volumes of wastewater that contains different dyes. Azo dyes contain strong N = N bond which is not easily broken by conventional methods. The discharge of this type of wastewater to natural watercourse can pose serious environmental impacts to aquatic life. Electrocoagulation (EC) method depends on several factors as electrode material, current density, operation time and PH. The review describes, discusses and compares the types of that electrode influencing the EC process in various wastewater and leachate. Both operating costs and electrical energy consumption values were found to vary greatly depending on the type of electrodes material and solution being treated.