Removing of the Dye Pollutant Acid Red 1 from Contaminated Waters by Electrocoagulation Method Using a Recirculating Tubular Reactor with Punched Anode

In the present study the removal of Acid red 1 (AR1), as a pollutant of contaminated waters, was investigated by the electrocoagulation method using a recirculating tubular reactor with punched anode. The role of the parameters affecting removal efficiency including current density, electrolysis time, electrolyte concentration and type, pH, the flow rate of the solution, and dye concentration was studied. Spectrophotometric results indicated that for 2500 ml of the dye solution containing 30 mg L-1 AR1 more than 95% of the dye was removed under the following conditions: current density of 1.3 mA cm-2, electrolysis time of 20 min, pH of 6, electrolyte dosage of 0/08 g L-1 , and the flow rate of 2 L min-1. Results showed that with an increase the electrolyte concentration and current density, color removal efficiency increases. Increasing of the flow rate of solution in the reactor due to decrease the retention time, decreases the removal efficiency. According to nature of electrocoagulation process, neutral range of pH is suitable for decolorization process.

Mohsen Garajehdaghi and Kambiz Seyyedi