The Effect of Process Parameters on Electro-coagulation Treatment of Paint Industrial Effluent
2023
Gezahegn, Getasew Yehuala | Desure, Oliyad Lencho | Mengistu, Amare Melaku
Number of electrodes, processing time and power supply were used as process parameters. The study conducted by preparing three electro-coagulation cells each having a volume of 1,800.0 mL, 6, 12, 18 aluminum electrodes (anode and cathode) with a respective dimensions of 8.0 cm, 9.0 cm and 2.0 mm of width, height and thickness, power supply of 5.0, 7.5, 10.0 V and 20.0, 40.0, 60.0 minutes of processing time. The distance between each plate of the anode and cathode electrodes were uniform for the three electro-coagulation cells. Between 20 and 60 minutes of processing time and increased supply of power from 5 to 12.5 V found to have a removal of 78.9% to 99.5% of white paint pigment Titanium Dioxide (TiO2); the anode and the power consumptions increased from 1.54 g/m to 4.32 g/m3 and 3.07 to 21.61 Wh/m3 respectively. The result obtained from response surface model was observed that the processing time, the power supply and their combined effect were significant on the removal percentage of white paint pigment TiO2; on the other hand the number of electrodes did not have significant effect. Based on the combined effect of treatment time and power consumptions, 99.44% of white paint pigment TiO2 removal was recorded at a lower power and anode consumption of 3.25 Wh/m3 and 1.63 g/m3 respectively, and with optimized parameters of 12 aluminum electrodes, power supply of 5 V and 60 minutes of processing time. Beside the successful removal efficiency of the white color pigment TiO2, COD, BOD5 and TSS were 98.01%, 96.97% and 95.68 % respectively; hence these values were below the permissible limit of Federal Environmental Protection Authority (FEPA).
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