چکیده مقاله
The increasing salinity of industrial effluents, particularly from textile dyeing, poses a major challenge to conventional wastewater treatment This study evaluated the performance of an electrocoagulation EC system at low current density for treating synthetic textile wastewater containing an azo dye under three salinity levels: 5, 20, and 35 g/L NaCl Experiments were performed in batch mode using iron electrodes at 1 mA/cm², an initial dye concentration of 100 mg/L, and an influent COD of 880 _x0017_7 34 6 mg/L The effects of salinity on color removal, COD reduction, turbidity, and anode corrosion were analyzed The results revealed that increasing salinity enhanced electrical conductivity and accelerated Fe2 /Fe3 generation, strengthening both coagulation and electrochemical oxidation mechanisms At 5 g/L NaCl, the EC system achieved 77 84_x0017_70 00 % color removal and 67 05_x0017_71 6 % COD reduction When salinity increased to 20 g/L, performance improved to 87 71_x0017_70 0 % color removal and 73 86_x0017_71 6 % COD reduction, representing the optimal balance between removal efficiency and system stability A further increase to 35 g/L NaCl yielded only a slight improvement in color removal 88 03_x0017_70 0 % but enhanced COD removal to 90 9_x0017_70 0 %, likely due to intensified oxidation reactions However, excessive salinity led to partial floc destabilization and mild electrode passivation Overall, a salinity level of 20 g/L NaCl was identified as the optimum condition, offering the best balance between pollutant removal, electrode stability, and operational cost The findings confirm that the low current density EC process provides a simple, efficient, and sustainable solution for treating saline textile wastewater
کلیدواژهها
نویسندگان
Sina Aghamolaei
Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
Elham Abdollahzadeh Sharghi
Environmental Group, Department of Energy, Materials and Energy Research Center, Karaj, Iran
بابک بنکدارپور
Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
Marziyeh Roodkhaneh
Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
شیوه ارجاع
Aghamolaei, Sina and Abdollahzadeh Sharghi, Elham and Bonakdarpour, Babak and Roodkhaneh, Marziyeh,1404,Performance Evaluation of Low Current Density Electrocoagulation in Textile Dyeing Wastewater Treatment under Different Salinity,The Third National Conference on Water Quality Management and the Fifth National Conference on Water Consumption Management with a Waste Reduction and Recycling Approach,Tehran
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