Arabian Journal for Science and Engineering ( IF 1.711 ) Pub Date : 2021-06-10 , DOI: 10.1007/s13369-021-05776-4 Getasew Yehuala, Zemene Worku, Kenatu Angassa, Thabo T. I. Nkambule, Jemal Fito
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.
本研究旨在使用全因子实验设计开发一种电化学电极，用于降解纺织工业废水的化学需氧量 (COD)。电化学方法是解决当前环境污染挑战的高贵、有效和高效的方法。纺织工业废水的表征按照 APHA 的标准方法进行。15.4 V直流电源用于操作电化学处理系统，而某些化学品如1.5 mg/L硫酸、6.3 M硝酸和100 g/L草酸溶液用于电极表面改性。采用反应时间为12、16、20分钟，pH为4、6、7，NaCl电解质浓度为2、4、6g/L等三个水平的三个因子。3预计会产生 27 次运行，但使用 Design Expert 12 将实验运行次数减少到 20 次。发现纺织工业废水的 BOD 5、COD 和 pH 值为 430.00 ± 3.00 mg/L，1730.00 ±分别为 2.00 毫克/升和 pH 值 6.88 ± 0.20。在反应时间为 16 分钟、pH 值为 4、电解质浓度为 6 g/L 的最佳实验条件下，COD 去除率最高为 94.1%，而 COD 去除率最低值为 65.9%。COD去除率回归分析（R 20.98) 表明电解质浓度是电化学降解的主要因素。一般来说，电化学降解是一种很有前景的处理技术，可用于修复纺织工业废水。