Abstract
This study was aimed to develop an electrochemical electrode for the degradation of chemical oxygen demand (COD) of the textile industrial wastewater using a full factorial experimental design. Electrochemical method is noble, effective, and efficient in solving the current environmental pollution challenge. Characterization of the textile industrial wastewater was carried out as per the standard method of APHA. The DC power supply of 15.4 V was used to operate the electrochemical treatment system whereas certain chemicals such as sulphuric acid 1.5 mg/L, nitric acid 6.3 M, and oxalic acid solution 100 g/L were used for surface modification of electrodes. Three factors with three-level such as the reaction time of 12, 16, and 20 min, pH, 4, 6, and 7, and NaCl electrolyte concentrations of 2, 4, and 6 g/L were used. The experimental design of the study was formulated as a 33 which was expected to generate 27 runs but the number of experimental runs was reduced to 20 runs using Design Expert 12. The BOD5, COD, and pH of the textile industrial effluent were found to be 430.00 ± 3.00 mg/L, 1730.00 ± 2.00 mg/L, and pH 6.88 ± 0.20, respectively. The maximum COD removal of 94.1% was recorded at the optimum experimental condition of reaction time 16 min, pH 4, and electrolyte concentration 6 g/L whereas the minimum COD removal value of 65.9% was obtained. The regression analysis of COD removal (R2 0.98) indicated that electrolyte concentration was the dominant factor for the degradation of electrochemical. Generally, electrochemical degradation is a promising treatment technology to be implemented to remediate textile industrial wastewater.
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We would like to thank the Ethiopian Road Authority (ERA) for the research fund and Addis Ababa Science and Technology University (AASTU) for the research facilities.
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Yehuala, G., Worku, Z., Angassa, K. et al. Electrochemical Degradation of Chemical Oxygen Demand in the Textile Industrial Wastewater Through the Modified Electrodes. Arab J Sci Eng 47, 5911–5922 (2022). https://doi.org/10.1007/s13369-021-05776-4
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DOI: https://doi.org/10.1007/s13369-021-05776-4