Electrocoagulation using a rotated anode: a novel reactor design for textile wastewater treatment

Abstract

This paper investigates the optimum operational conditions of a novel rotated bed electrocoagulation (EC) reactor for the treatment of textile wastewater. The effect of various operational parameters such as rotational speed, current density (CD), operational time (RT), pH, temperature, and inter-electrode distance (IED) on the pollutant removal efficiency were examined. In addition, the consumption of aluminum (Al) and electrical energy, as well as operating costs at optimum conditions were also calculated. The results indicated that the optimum conditions for the treatment of textile wastewater were achieved at CD = 4 mA/cm2, RT = 10 min, rotational speed = 150 rpm, pH = 4.57, temperature = 25 \xB0C, and IED = 1 cm. The electrode consumption, energy consumption, and operating costs were 0.038 kg/m3, 4.66 kWh/m3 and 0.44 US/m3, respectively. The removal efficiencies of chemical oxygen demand (COD), biological oxygen demand (BOD), total suspended solid (TSS), turbidity and color were 97.10, 95.55, 98, 96 and 98.50, respectively, at the first 10 min of reaction time, while the phenol compound of the wastewater was almost entirely removed (99.99). The experimental results confirm that the new reactor design with rotated anode impellers and cathode rings provided high treatment efficiency at a reduced reaction time and with lower energy consumption. \xA9 2016 Elsevier Ltd.