Africa Center of Excellence for Water Management, Addis Ababa University, P.O. Box: 1176, Addis Ababa, Ethiopia E-mail:
College of Natural and Computational Sciences, Department of Chemistry, Addis Ababa University, Addis Ababa, Ethiopia.
Water Sci Technol. 2022 Mar;85(5):1549-1567. doi: 10.2166/wst.2022.061.
In this study, the performance of the electrocoagulation (EC) process was evaluated for its capability to remove color, total organic carbon (TOC), chemical oxygen demand (COD) using aluminium electrodes. Response surface methodology based on Box-Behnken design was used to optimize different operating conditions of the processes. The interaction effects of four independent variables such as dye concentration, applied current density, electrolysis time, and pH on the percentage of COD, TOC, and color removal were investigated by the EC process. ANOVA analysis was made to examine the significance of input parameters and their interaction effect on responses. At the optimum operating conditions, 89% of color, 47% of TOC, and 76% of COD removal rate were achieved using the EC process. Different research works have been reported on the treatment of textile wastewater by the EC process. However, these researches vary regarding working conditions such as dye type, concentration, current density, pH, electrolysis time, and electrode type. Also, most literature focuses mainly on the performance of the technology. However, it is also important to investigate the economic aspect, removal mechanism, and mineralization study. Thus, economic analyses, mineralization, kinetic, sludge characterization studies of the technology were performed.
在这项研究中，评估了电凝聚（EC）工艺在使用铝电极去除颜色、总有机碳（TOC）和化学需氧量（COD）方面的性能。基于 Box-Behnken 设计的响应面法被用于优化工艺的不同操作条件。通过 EC 工艺研究了染料浓度、施加电流密度、电解时间和 pH 等四个独立变量对 COD、TOC 和颜色去除率的百分比的相互作用效应。通过 ANOVA 分析检验了输入参数及其对响应的相互作用效应对的显著性。在最佳操作条件下，EC 工艺可实现 89%的颜色去除率、47%的 TOC 去除率和 76%的 COD 去除率。已有许多关于 EC 工艺处理纺织废水的研究工作。然而，这些研究在染料类型、浓度、电流密度、pH 值、电解时间和电极类型等工作条件方面存在差异。此外，大多数文献主要侧重于技术的性能。然而，研究技术的经济性、去除机制和矿化研究也很重要。因此，对该技术进行了经济分析、矿化、动力学和污泥特性研究。
