Water Science and Technology (Mar 2022)
Investigation of cotton textile industry wastewater treatment with electrocoagulation process: performance, mineralization, and kinetic study
Abstract
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. HIGHLIGHTS The EC process was employed for textile wastewater treatment.; Interaction effects of EC operating parameters and its performance was evaluated.; The obtained optimum operating conditions were tested for real textile wastewater.; The technology performed well to remove pollutants from textile wastewater.; The mineralization, kinetic, sludge characterization study, and economic analysis of the technology were performed.;
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