الفهرس 
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Abstract
Large amount of fresh water are consumed in many industries such as textile, paper, leather, plastic, pharmaceutical and food industries that discharge its hazardous wastewater into water resources or wastewater network without proper treatment which causes aesthetic problems to the environment and produces cariogenic contaminants which have harmful effects on human health. So the treatment and reuse of industrial wastewater have become an absolute necessity. Electrocoagulation (EC) is one of the attractive technologies for textile wastewater treatment because it is simple, economic and less sludge production, less chemical addition, larger and more stable flocs formation. Large amounts of residuals produced form water purification plants which need to be treated before disposal, that increase the operational cost of water treatment. Therefore, reusing of water purification residuals has become a significant environmental issue.The main objective of this study is to enhance the EC performance using powdered residuals from water purification plants (PRWPP) and to identify the optimum conditions for operation. A comparison between EC alone and after the addition of PRWPP was carried out. The effect of various operational conditions such as applied voltage, PRWPP dosage, initial pH and influent dye concentration on color removal efficiency and energy consumption was investigated. A series of laboratory scale experiments were conducted using an EC bench scale reactor with iron electrodes.It was noticed that the removal efficiency of dye stabilized after 20 to 25 min. of operation using applied voltage between 10 to 20 V for EC alone system. The results indicate that the dye was removed with high efficiency using applied voltage of 10 V and initial pH ranged from 6 to 9 for a solution with initial dye concentration of 250 mg/l. Color removal efficiency is inversely related to solution initial dye concentration. However, the energy consumption efficiency is directly related to solution initial dye concentration.